Professor Patrick Regan

Professor

Qualifications: BSc (1988 Liverpool), DPhil (1991, York), CPhys, FInstP

Email:
Phone: Work: 01483 68 6783
Room no: 05 BC 04

Further information

Biography

Paddy Regan joined the academic staff in the Physics Department at Surrey in 1994 after holding postdoctoral research positions at the University of Pennsylvania, USA and the Australian National University in Canberra. Paddy is the MSc in Radiation and Environmental Protection course coordinator. He was elected a Fellow of the Institute of Physics in 2000.  He has been a Visiting Research Associate at the Wright Nuclear Structure Laboratory, Yale University since 2002 and an Adjunct Professor at the University of Notre Dame (London Programme) since 2003. From 2001 until 2010, he was the Collaboration Spokesperson for the Stopped RISING Collaboration which studied the internal structure of exotic forms of atomic nuclei following either metastable state or beta-decay. He has served as the Chair of the GSI Users Executive Committee (2009) and and as  a member of the Science and Technologies Facilities Council (STFC) Education, Training and Careers (ETC) Committee (2007-2011). He is the current Chair of the PreSPEC International Steering Committee, which oversees the experimental programme for nuclear structure physics at GSI/FAIR. He is elected member of the NuSTAR Board for the FAIR project in Darmstadt, Germany.  

He has successfully supervised 20 PhD students and over 100 MSc research dissertation projects to completion to date. He has coauthored more than 200 refereed papers on nuclear structure and radiation detection research in the scientific literature and given more than 80 invited international conference and workshop presentations on his research. He also pursues research into measurements of naturally occurring radioactive materials (NORM) in the environment using applications of the gamma-ray spectroscopic techniques he uses in his more fundamental research projects.  He is also regularly engaged by the TV, radio and written press media on issues related to radiation and nuclear physics. In this capacity he has made over 100 mainstream TV and radio appearances on issues related to radiation physics in the last three years.  In his spare time Paddy plays a poor game of squash, even worse golf and tries to do the occasional sponsored run for the Mental Health Charity MIND. He is married to Susie , a nurse, and they have four school-age children, Hannah, John, Sarah and Rebekah.

Research Interests

Paddy specialises in using gamma-ray and charged-particle spectroscopic techniques to study exotic forms of nuclear matter, with particular emphasis on unusual proton to neutron ratios and the behavour of nuclei at large angular momentum. This includes work using radioactive ion-beams, produced following projectile fragmentation reactions to study decays of excited nuclear states in very exotic nuclear species. He is also interested in the interface between how atomic nuclei generate and hold angular momentum by competing single-particle and collective (rotational and vibrational) modes. He is also intertested in measurements of naturally occurring radioactive materials (NORM) in environmental samples using applications of the gamma-ray spectroscopic techniques he uses in his more fundamental research projects. 

Research Collaborations

Paddy has led experimental nuclear physics experiments at laboratories in the UK, Denmark, Australia, Canada, South Africa, France, Germany, Italy and the USA. He has been the spokesperson for a number of international programmes to produce and study the internal structure of new, radioactive isotopes, including investigations into the variation of nuclear shapes with increasing angular momentum. He is a member of the GSI-NUSTAR Board of Representatives. He is the Chair of the GSI Users Excecutive Committee and has been the Spokesperson for the Stopped Beam RISING Collaboration since 2001. 

Further details can be found on my personal web page.

A full list of publications, conference presentations, and patents can be found here.

Publications

Highlights

  • Grodner E, Gadea A, Sarriguren P, Lenzi SM, Gre Bosz J, Valiente-Dobón JJ, Algora A, Górska M, Regan PH, Rudolph D, de Angelis G, Agramunt J, Alkhomashi N, Amon Susam L, Bazzacco D, Benlliure J, Benzoni G, Boutachkov P, Bracco A, Caceres L, Cakirli RB, Crespi FC, Domingo-Pardo C, Doncel M, Dombrádi Z, Doornenbal P, Farnea E, Ganioğlu E, Gelletly W, Gerl J, Gottardo A, Hüyük T, Kurz N, Leoni S, Mengoni D, Molina F, Morales AI, Orlandi R, Oktem Y, Page RD, Perez D, Pietri S, Podolyák Z, Poves A, Quintana B, Rinta-Antila S, Rubio B, Nara Singh BS, Steer AN, Verma S, Wadsworth R, Wieland O, Wollersheim HJ. (2014) 'Hindered gamow-teller decay to the odd-odd n=z ^{62}ga: absence of proton-neutron t=0 condensate in a=62.'. Phys Rev Lett, United States: 113 (9)

    Abstract

    Search for a new kind of superfluidity built on collective proton-neutron pairs with aligned spin is performed studying the Gamow-Teller decay of the T=1, J^{π}=0^{+} ground state of ^{62}Ge into excited states of the odd-odd N=Z nucleus ^{62}Ga. The experiment is performed at GSI Helmholtzzentrum für Shwerionenforshung with the ^{62}Ge ions selected by the fragment separator and implanted in a stack of Si-strip detectors, surrounded by the RISING Ge array. A half-life of T_{1/2}=82.9(14)  ms is measured for the ^{62}Ge ground state. Six excited states of ^{62}Ga, populated below 2.5 MeV through Gamow-Teller transitions, are identified. Individual Gamow-Teller transition strengths agree well with theoretical predictions of the interacting shell model and the quasiparticle random phase approximation. The absence of any sizable low-lying Gamow-Teller strength in the reported beta-decay experiment supports the hypothesis of a negligible role of coherent T=0 proton-neutron correlations in ^{62}Ga.

  • Morales AI, Benlliure J, Kurtukián-Nieto T, Schmidt KH, Verma S, Regan PH, Podolyák Z, Górska M, Pietri S, Kumar R, Casarejos E, Al-Dahan N, Algora A, Alkhomashi N, Álvarez-Pol H, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Cáceres LS, Cullen IJ, Denis Bacelar AM, Doornenbal P, Estévez-Aguado ME, Farrelly G, Fujita Y, Garnsworthy AB, Gelletly W, Gerl J, Grebosz J, Hoischen R, Kojouharov I, Kurz N, Lalkovski S, Liu Z, Mihai C, Molina F, Mücher D, Rubio B, Shaffner H, Steer SJ, Tamii A, Tashenov S, Valiente-Dobón JJ, Walker PM, Wollersheim HJ, Woods PJ. (2014) 'Half-life systematics across the N=126 shell closure: role of first-forbidden transitions in the β decay of heavy neutron-rich nuclei.'. Phys Rev Lett, United States: 113 (2)

    Abstract

    This Letter reports on a systematic study of β-decay half-lives of neutron-rich nuclei around doubly magic (208)Pb. The lifetimes of the 126-neutron shell isotone (204)Pt and the neighboring (200-202)Ir, (203)Pt, (204)Au are presented together with other 19 half-lives measured during the "stopped beam" campaign of the rare isotope investigations at GSI collaboration. The results constrain the main nuclear theories used in calculations of r-process nucleosynthesis. Predictions based on a statistical macroscopic description of the first-forbidden β strength reveal significant deviations for most of the nuclei with N<126. In contrast, theories including a fully microscopic treatment of allowed and first-forbidden transitions reproduce more satisfactorily the trend in the measured half-lives for the nuclei in this region, where the r-process pathway passes through during β decay back to stability.

  • Al-Dahan N, Regan PH, Podolyák Z, Walker PM, Alkhomashi N, Dracoulis GD, Farrelly G, Benlliure J, Pietri SB, Casten RF, Stevenson PD, Gelletly W, Steer SJ, Garnsworthy AB, Casarejos E, Gerl J, Wollersheim HJ, Grebosz J, Górska M, Kojouharov I, Schaffner H, Algora A, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Cullen IJ, Denis Bacelar AM, Deo AY, Estevez ME, Fujita Y, Hoischen R, Kumar R, Lalkovski S, Liu Z, Mason PJ, Mihai C, Molina F, Mücher D, Rubio B, Tamii A, Tashenov S, Valiente-Dobón JJ, Woods PJ. (2012) 'Multiple β - Decaying states in 194Re: Shape evolution in neutron-rich osmium isotopes'. Physical Review C - Nuclear Physics, 85 (3) Article number 034301

    Abstract

    decays from heavy, neutron-rich nuclei with A∼190 have been investigated following their production via the relativistic projectile fragmentation of an E/A=1 GeV 208Pb primary beam on a ∼2.5 g/cm2 9Be target. The reaction products were separated and identified using the GSI FRagment Separator (FRS) and stopped in the RISING active stopper. γ decays were observed and correlated with these secondary ions on an event-by-event basis such that γ-ray transitions following from both internal (isomeric) and β decays were recorded. A number of discrete, β-delayed γ-ray transitions associated with β decays from 194Re to excited states in 194Os have been observed, including previously reported decays from the yrast Iπ=(6+) state. Three previously unreported γ-ray transitions with energies 194, 349, and 554 keV are also identified; these transitions are associated with decays from higher spin states in 194Os. The results of these investigations are compared with theoretical predictions from Nilsson multi-quasiparticle (MQP) calculations. Based on lifetime measurements and the observed feeding pattern to states in 194Os, it is concluded that there are three β−-decaying states in 194Re.

  • Singh BSN, Liu Z, Wadsworth R, Grawe H, Brock TS, Boutachkov P, Braun N, Blazhev A, Gorska M, Pietri S, Rudolph D, Domingo-Pardo C, Steer SJ, Atac A, Bettermann L, Caceres L, Eppinger K, Engert T, Faestermann T, Farinon F, Finke F, Geibel K, Gerl J, Gernhaeuser R, Goel N, Gottardo A, Grebosz J, Hinke C, Hoischen R, Ilie G, Iwasaki H, Jolie J, Kaskas A, Kojouharov I, Kruecken R, Kurz N, Merchan E, Nociforo C, Nyberg J, Pfuetzner M, Prochazka A, Podolyak Z, Regan PH, Reiter P, Rinta-Antila S, Scholl C, Schaffner H, Soderstrom P-A, Warr N, Weick H, Wollersheim H-J, Woods PJ, Nowacki F, Sieja K. (2011) '16(+) Spin-Gap Isomer in Cd-96'. PHYSICAL REVIEW LETTERS, 107 (17) Article number ARTN 172502
  • Nara Singh BS, Liu Z, Wadsworth R, Grawe H, Brock TS, Boutachkov P, Braun N, Blazhev A, Górska M, Pietri S, Rudolph D, Domingo-Pardo C, Steer SJ, Ataç A, Bettermann L, Cáceres L, Eppinger K, Engert T, Faestermann T, Farinon F, Finke F, Geibel K, Gerl J, Gernhäuser R, Goel N, Gottardo A, Grabosz J, Hinke C, Hoischen R, Ilie G, Iwasaki H, Jolie J, Kaşkaş A, Kojouharov I, Krücken R, Kurz N, Merchán E, Nociforo C, Nyberg J, Pfützner M, Prochazka A, Podolyák Z, Regan PH, Reiter P, Rinta-Antila S, Scholl C, Schaffner H, Söderström P-A, Warr N, Weick H, Wollersheim H-J, Woods PJ, Nowacki F, Sieja K. (2011) '16+ spin-gap isomer in Cd96'. Physical Review Letters, 107 (17) Article number 172502
  • Steer SJ, Podolyak Z, Pietri S, Gorska M, Grawe H, Maier KH, Regan PH, Rudolph D, Garnsworthy AB, Hoischen R. (2011) 'Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a (208)Pb beam'. PHYSICAL REVIEW C, 84 (4) Article number ARTN 044313
  • Soderstrom P-A, Nyberg J, Regan PH, Algora A, de Angelis G, Ashley SF, Aydin S, Bazzacco D, Casperson RJ, Catford WN, Cederkall J, Chapman R, Corradi L, Fahlander C, Farnea E, Fioretto E, Freeman SJ, Gadea A, Gelletly W, Gottardo A, Grodner E, He CY, Jones GA, Keyes K, Labiche M, Liang X, Liu Z, Lunardi S, Marginean N, Mason P, Menegazzo R, Mengoni D, Montagnoli G, Napoli D, Ollier J, Pietri S, Podolyak Z, Pollarolo G, Recchia F, Sahin E, Scarlassara F, Silvestri R, Smith JF, Spohr K-M, Steer SJ, Stefanini AM, Szilner S, Thompson NJ, Tveten GM, Ur CA, Valiente-Dobon JJ, Werner V, Williams SJ, Xu FR, Zhu JY. (2010) 'Spectroscopy of neutron-rich Dy-168,Dy-170: Yrast band evolution close to the NpNn valence maximum'. PHYSICAL REVIEW C, 81 (3) Article number ARTN 034310
  • Garnsworthy AB, Regan PH, Pietri S, Sun Y, Xu FR, Rudolph D, Gorska M, Caceres L, Podolyak Z, Steer SJ, Hoischen R, Heinz A, Becker F, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grawe H, Grebosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopwicz W, Saito T, Schaffner H, Tachenov S, Werner-Malento E, Wollersheim HJ, Benzoni G, Blank B, Brandau C, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Gelletly W, Ilie G, Jolie J, Jones GA, Jungclaus A, Kmiecik M, Kondev FG, Kurtukian-Nieto T, Lalkovski S, Liu Z, Maj A, Myalski S, Pfuetzner M, Schwertel S, Shizuma T, Simons AJ, Walker PM, Wieland O. (2009) 'Isomeric states in neutron-deficient A similar to 80-90 nuclei populated in the fragmentation of Ag-107'. PHYSICAL REVIEW C, 80 (6) Article number ARTN 064303
  • Alkhomashi N, Regan PH, Podolyak Z, Pietri S, Garnsworthy AB, Steer SJ, Benlliure J, Caserejos E, Casten RF, Gerl J, Wollersheim HJ, Grebosz J, Farrelly G, Gorska M, Kojouharov I, Schaffner H, Algora A, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Bacelar AMD, Cullen IJ, Caceres L, Doornenbal P, Estevez ME, Fujita Y, Gelletly W, Hoischen R, Kumar R, Kurz N, Lalkovski S, Liu Z, Mihai C, Molina F, Morales AI, Muecher D, Prokopowicz W, Rubio B, Shi Y, Tamii A, Tashenov S, Valiente-Dobon JJ, Walker PM, Woods PJ, Xu FR. (2009) 'beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes'. PHYSICAL REVIEW C, 80 (6) Article number ARTN 064308
  • Al-Dahan N, Podolyak Z, Regan PH, Gorska M, Grawe H, Maier KH, Gerl J, Pietri SB, Wollersheim HJ, Alkhomashi N, Deo AY, Bacelar AMD, Farrelly G, Steer SJ, Bruce AM, Boutachkov P, Domingo-Pardo C, Algora A, Benlliure J, Bracco A, Calore E, Casarejos E, Cullen IJ, Detistov P, Dombradi Z, Doncel M, Farinon F, Gelletly W, Geissel H, Goel N, Grebosz J, Hoischen R, Kojouharov I, Kurz N, Lalkovski S, Leoni S, Molina F, Montanari D, Morales AI, Musumarra A, Napoli DR, Nicolini R, Nociforo C, Prochazka A, Prokopowicz W, Rubio B, Rudolph D, Schaffner H, Strmen P, Szarka I, Swan T, Thomas JS, Valiente-Dobon JJ, Verma S, Walker PM, Weick H. (2009) 'Nuclear structure "southeast" of Pb-208: Isomeric states in Hg-208 and Tl-209'. PHYSICAL REVIEW C, 80 (6) Article number ARTN 061302
  • Gorska M, Caceres L, Grawe H, Pfuetzner M, Jungclaus A, Pietri S, Werner-Malento E, Podolyak Z, Regan PH, Rudolph D, Detistov R, Lalkovski S, Modamio V, Walker J, Beck T, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grebosz J, Hoischen R, Kojouharov I, Kurz N, Prokopowicz W, Schaffner H, Weick H, Wollersheim H-J, Andgren K, Benlliure J, Benzoni G, Bruce AM, Casarejos E, Cederwall B, Crespi FCL, Hadinia B, Hellstrom M, Ilie G, Khaplanov A, Kmiecik M, Kumar R, Maj A, Mandal S, Montes F, Myalski S, Simpson GS, Steer SJ, Tashenov S, Wieland O, Dombradi Z, Reiter R, Sohler D. (2009) 'Evolution of the N=82 shell gap below Sn-132 inferred from core excited states in In-131'. PHYSICS LETTERS B, 672 (4-5), pp. 313-316.
  • Podolyak Z, Farrelly GF, Regan PH, Garnsworthy AB, Steer SJ, Gorska M, Benlliure J, Casarejos E, Pietri S, Gerl J, Wollersheim HJ, Kumar R, Molina F, Algora A, Alkhomashi N, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Caceres L, Cullen IJ, Bacelar AMD, Doornenbal P, Estevez ME, Fujita Y, Gelletly W, Geissel H, Grawe H, Grebosz J, Hoischen R, Kojouharov I, Lalkovski S, Liu Z, Maier KH, Mihai C, Muecher D, Rubio B, Schaffner H, Tamii A, Tashenov S, Valiente-Dobon JJ, Walker PM, Woods PJ. (2009) 'Proton-hole excitation in the closed shell nucleus Au-205'. PHYSICS LETTERS B, 672 (2), pp. 116-119.
  • Alkhomashi N, Regan PH, Podolyák Z, Pietri S, Garnsworthy AB, Steer SJ, Benlliure J, Caserejos E, Casten RF, Gerl J, Wollersheim HJ, Grebosz J, Farrelly G, Górska M, Kojouharov I, Schaffner H, Algora A, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Bacelar AMD, Cullen IJ, Cáceres L, Doornenbal P, Estevez ME, Fujita Y, Gelletly W, Hoischen R, Kumar R, Kurz N, Lalkovski S, Liu Z, Mihai C, Molina F, Morales AI, Mücher D, Prokopowicz W, Rubio B, Shi Y, Tamii A, Tashenov S, Valiente-Dobón JJ, Walker PM, Woods PJ, Xu FR. (2009) 'β - Dcopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes'. Physical Review C - Nuclear Physics, 80 (6) Article number 064308 , pp. 1-12.
  • Steer SJ, Podolyak Z, Pietri S, Gorska M, Regan PH, Rudolph D, Werner-Malento E, Garnsworthy AB, Hoischen R, Gerl J, Wollersheim HJ, Maier KH, Grawe H, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Geissel H, Greabosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tashenov S, Heinz A, Pfuetzner M, Kurtukian-Nieto T, Benzoni G, Jungclaus A, Balabanski DL, Brandau C, Brown BA, Bruce AM, Catford WN, Cullen IJ, Dombradi Z, Estevez ME, Gelletly W, Ilie G, Jolie J, Jones GA, Kmiecik M, Kondev FG, Kruecken R, Lalkovski S, Liu Z, Maj A, Myalski S, Schwertel S, Shizuma T, Walker PM, Wieland O. (2008) 'Single-particle behavior at N=126: Isomeric decays in neutron-rich Pt-204'. PHYSICAL REVIEW C, 78 (6) Article number ARTN 061302
  • Garnsworthy AB, Regan PH, Caceres L, Pietri Y, Sun Y, Rudolph D, Gorska M, Podolyak Z, Steer SJ, Hoischen R, Heinz A, Becker F, Bednarczyk R, Doornenbal P, Geissel H, Gerl J, Grawe H, Grebosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tachenov S, Werner-Malento E, Wollersheim HJ, Benzoni G, Blank BB, Brandau C, Bruce AM, Camera F, Catford WN, Cullen IJ, Dornbradi Z, Estevez E, Gelletly W, Ilie G, Jolie J, Jones GA, Jungclaus A, Kmiecik M, Kondev FG, Kurtukian-Nieto T, Lalkovski S, Liu Z, Maj A, Myalski S, Pfutzner M, Schwertel S, Shizuma T, Simons AJ, Walker PM, Wieland O, Xu FR. (2008) 'Neutron-proton pairing competition in N = Z nuclei: Metastable state decays in the proton dripline nuclei (82)(41)Nb and (86)(43)TC (vol 660, pg 326, 2008)'. PHYSICS LETTERS B, 668 (5), pp. 460-460.
  • Rudolph D, Hoischen R, Hellstrom M, Pietri S, Podolyak Z, Regan PH, Garnsworthy AB, Steer SJ, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Gerl J, Gorska M, Grebosz J, Kojouharov I, Kurz N, Prokopowicz W, Schaffner H, Wollersheim HJ, Andersson L-L, Atanasova L, Balabanski DL, Bentley MA, Blazhev A, Brandau C, Brown JR, Fahlander C, Johansson EK, Jungclaus A, Lenzi SM. (2008) 'Isospin symmetry and proton decay: Identification of the 10(+) isomer in (54)Ni'. PHYSICAL REVIEW C, 78 (2) Article number ARTN 021301
  • Garnsworthy AB, Regan PH, Caceres L, Pietri S, Sun Y, Rudolph D, Gorska M, Podolyak Z, Steer SJ, Hoischen R, Heinz A, Becker F, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grawe H, Grebosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tachenov S, Werner-Malento E, Wollersheim HJ, Benzoni G, Blank BB, Brandau C, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Gelletly W, Ilie G, Jolie J, Jones GA, Jungclaus A, Kmiecik M, Kondev FG, Kurtukian-Nieto T, Lalkovski S, Liu Z, Maj A, Myalski S, Pfutzner M, Schwertel S, Shizuma T, Simons AJ, Walker PM, Wielandi O, Xu FR. (2008) 'Neutron-proton pairing competition in N = Z nuclei: Metastable state decays in the proton dripline nuclei Nb-82(41) and Tc-86(43)'. PHYSICS LETTERS B, 660 (4), pp. 326-330.
  • Garnsworthy AB, Regan PH, Cáceres L, Pietri S, Sun Y, Rudolph D, Górska M, Podolyák Z, Steer SJ, Hoischen R, Heinz A, Becker F, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grawe H, Grȩbosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tachenov S, Werner-Malento E, Wollersheim HJ, Benzoni G, Blank BB, Brandau C, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombrádi Z, Estevez E, Gelletly W, Ilie G, Jolie J, Jones GA, Jungclaus A, Kmiecik M, Kondev FG, Kurtukian-Nieto T, Lalkovski S, Liu Z, Maj A, Myalski S, Pfützner M, Schwertel S, Shizuma T, Simons AJ, Walker PM, Wieland O, Xu FR. (2008) 'Erratum to: "Neutron-proton pairing competition in N = Z nuclei: Metastable state decays in the proton dripline nuclei 82 41Nb and 86 43Tc"'. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 668 (5), pp. 460-460.
  • Pietri S, Regan PH, Podolyak Z, Rudolph D, Steer S, Garnsworthy AB, Werner-Malento E, Hoischen R, Gorska M, Gerl J, Wollersheim HJ, Kojouharov I, Schaffner H, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Geissel H, Grebosz J, Kelic A, Kurz N, Montes F, Prokopowicz W, Saito T, Tashenov S, Heinz A, Pfuetzner M, Kurtukian-Nieto T, Benzoni G, Hellstrom M, Jungclaus A, Simpson J, Andersson L-L, Atanasova L, Balabanski D, Bentley MA, Blank B, Blazhev A, Brandau C, Brown JR, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Fahlander C, Gelletly W, Ilie G, Johansson EK, Jolie J, Jones GA, Kmiecik M, Kondev FG, Lalkovski S, Liu Z, Maj A, Myalski S, Shizuma T, Simons AJ, Schwertel S, Walker PM, Wieland O. (2007) 'Recent results in fragmentation isomer spectroscopy with rising'. ELSEVIER SCIENCE BV NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, Ft Worth, TX: 19th International Conference on Application of Accelerators in Research and Industry 261 (1-2), pp. 1079-1083.

Journal articles

  • Régis J-M, Saed-Samii N, Jolie J, Pascovici G, Warr N, Simpson GS, Drouet F, Vancraeyenest A, Smith JF, Blanc A, Jentschel M, Köster U, Mutti P, Soldner T, Urban W, De France G, Paziy V, Fraile LM, Mach H, Ur CA, Bruce AM, Roberts OJ, Ilieva S, Kröll T, Korten W, Lalkovski S, Mǎrginean N, Podolyak Z, Regan PH, Townsley C. (2014) 'Germanium-gated γ-γ Fast timing of excited states in fission fragments using the EXILL&FATIMA spectrometer'. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 763, pp. 210-220.

    Abstract

    A high-granularity mixed spectrometer consisting of high-resolution Ge and very fast LaBr(Ce)-scintillator detectors has been installed around a fission target at the cold-neutron guide PF1B of the high-flux reactor of the Institut Laue-Langevin. Lifetimes of excited states in the range of 10 ps to 10 ns can be measured in around 100 exotic neutron-rich fission fragments using Ge-gated LaBr(Ce)-LaBr(Ce) or Ge-Ge-LaBr (Ce)-LaBr(Ce) coincidences. We report on various characteristics of the EXILL&FATIMA spectrometer for the energy range of 40 keV up to 6.8 MeV and present results of ps-lifetime test measurements in a fission fragment. The results are discussed with respect to possible systematic errors induced by background contributions. © 2014 Published by Elsevier B.V.

  • Britton R, Regan PH, Burnett JL, Davies AV. (2014) 'Monte-Carlo optimisation of a Compton suppression system for use with a broad-energy HPGe detector'. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 762, pp. 42-53.

    Abstract

    Monte-Carlo simulations are used to evaluate and optimise multiple components of a Compton Suppression System based upon a Broad-energy HPGe primary detector. Several materials for the secondary crystal are evaluated, including NaI(Tl), BGO and LaBr(Ce). BGO was found to be the most effective across the required energy range, with the sizes of the proposed veto detector then optimised to extract the maximum performance for a given volume of material. Suppression factors are calculated for a range of nuclides (both single and cascade emitters) with improvements of 2 for the Compton Suppression Factors, and 10 for the continuum reduction when compared to the Compton suppression system currently in use. This equates to a reduction in the continuum by up to a factor of ∼240 for radionuclides such as Co, which is crucial for the detection of low-energy, low-activity γ emitters typically swamped by such a continuum. © 2014 Published by Elsevier B.V. All rights reserved.

  • Gottardo A, Valiente-Dobón JJ, De Angelis G, Modamio V, Napoli DR, Sahin E, Lunardi S, John PR, Lenzi SM, Benzoni G, Bracco A, Camera F, Crespi FCL, Corsi A, Leoni S, Million B, Morales AI, Nicolini R, Wieland O, Bazzacco D, Farnea E, Menegazzo R, Mengoni D, Recchia F, Ur CA, Gadea A, Algora A, Al-Dahan N, Bowry M, Deo AY, Farrelly GF, Podolyák Z, Regan PH, Reed MW, Swan TPD, Walker PM, Ayyad Y, Benlliure J, Boutachkov P, Cortes ML, Domingo-Pardo C, Engert T, Farinon F, Geissel H, Gerl J, Goel N, Górska M, Gregor E, Habermann T, Hoischen R, Kojouharov I, Kurz N, Naqvi F, Nociforo C, Pietri S, Prochazka A, Prokopowicz W, Schaffner H, Sharma A, Weick H, Wollersheim H-J, Bruce AM, Bunce M, Denis Bacelar AM, Casarejos E, Doncel M, Eppinger K, Klupp S, Steiger K, Grebosz J, Rudolph D, Janik R, Sitar B, Strmen P, Szarka I, Mandal S, Siwal D, Pfützner M. (2014) 'Isomeric decay spectroscopy of the Bi 217 isotope'. Physical Review C - Nuclear Physics, 90 (3)

    Abstract

    The structure of the neutron-rich bismuth isotope Bi217 has been studied for the first time. The fragmentation of a primary U238 beam at the FRS-RISING setup at GSI was exploited to perform γ-decay spectroscopy, since μs isomeric states were expected in this nucleus. Gamma rays following the decay of a t1/2=3 μs isomer were observed, allowing one to establish the low-lying structure of Bi217. The level energies and the reduced electric quadrupole transition probability B(E2) from the isomeric state are compared to large-scale shell-model calculations.

  • Santawamaitre T, Malain D, Al-Sulaiti HA, Bradley DA, Matthews MC, Regan PH. (2014) 'Determination of (238)U, (232)Th and (40)K activity concentrations in riverbank soil along the Chao Phraya river basin in Thailand.'. J Environ Radioact, 138C, pp. 80-86.

    Abstract

    The activity concentrations of (238)U, (232)Th and (40)K in riverbank soil along the Chao Phraya river basin was determined through gamma-ray spectrometry measurements made using a hyper-pure germanium detector in a low background configuration. The ranges of activity concentrations of (238)U, (232)Th and (40)K were found to be 13.9 ↔ 76.8, 12.9 ↔ 142.9 and 178.4 ↔ 810.7 Bq kg(-1), respectively. The anthropogenic radionuclide, (137)Cs, was not observed in statistically significant amounts above the background level in the current study. The absorbed gamma dose rate in air at 1 m above the ground surface, the outdoor annual effective dose equivalent, the values of the radium equivalent activity and the external hazard index associated with all the soil samples in the present work were evaluated. The results indicate that the radiation hazard from primordial radionuclides in all soil samples from the area studied in this current work is not significant.

  • Grodner E, Gadea A, Sarriguren P, Lenzi SM, Gre Bosz J, Valiente-Dobón JJ, Algora A, Górska M, Regan PH, Rudolph D, de Angelis G, Agramunt J, Alkhomashi N, Amon Susam L, Bazzacco D, Benlliure J, Benzoni G, Boutachkov P, Bracco A, Caceres L, Cakirli RB, Crespi FC, Domingo-Pardo C, Doncel M, Dombrádi Z, Doornenbal P, Farnea E, Ganioğlu E, Gelletly W, Gerl J, Gottardo A, Hüyük T, Kurz N, Leoni S, Mengoni D, Molina F, Morales AI, Orlandi R, Oktem Y, Page RD, Perez D, Pietri S, Podolyák Z, Poves A, Quintana B, Rinta-Antila S, Rubio B, Nara Singh BS, Steer AN, Verma S, Wadsworth R, Wieland O, Wollersheim HJ. (2014) 'Hindered gamow-teller decay to the odd-odd n=z ^{62}ga: absence of proton-neutron t=0 condensate in a=62.'. Phys Rev Lett, United States: 113 (9)

    Abstract

    Search for a new kind of superfluidity built on collective proton-neutron pairs with aligned spin is performed studying the Gamow-Teller decay of the T=1, J^{π}=0^{+} ground state of ^{62}Ge into excited states of the odd-odd N=Z nucleus ^{62}Ga. The experiment is performed at GSI Helmholtzzentrum für Shwerionenforshung with the ^{62}Ge ions selected by the fragment separator and implanted in a stack of Si-strip detectors, surrounded by the RISING Ge array. A half-life of T_{1/2}=82.9(14)  ms is measured for the ^{62}Ge ground state. Six excited states of ^{62}Ga, populated below 2.5 MeV through Gamow-Teller transitions, are identified. Individual Gamow-Teller transition strengths agree well with theoretical predictions of the interacting shell model and the quasiparticle random phase approximation. The absence of any sizable low-lying Gamow-Teller strength in the reported beta-decay experiment supports the hypothesis of a negligible role of coherent T=0 proton-neutron correlations in ^{62}Ga.

  • Morales AI, Benlliure J, Kurtukián-Nieto T, Schmidt KH, Verma S, Regan PH, Podolyák Z, Górska M, Pietri S, Kumar R, Casarejos E, Al-Dahan N, Algora A, Alkhomashi N, Álvarez-Pol H, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Cáceres LS, Cullen IJ, Denis Bacelar AM, Doornenbal P, Estévez-Aguado ME, Farrelly G, Fujita Y, Garnsworthy AB, Gelletly W, Gerl J, Grebosz J, Hoischen R, Kojouharov I, Kurz N, Lalkovski S, Liu Z, Mihai C, Molina F, Mücher D, Rubio B, Shaffner H, Steer SJ, Tamii A, Tashenov S, Valiente-Dobón JJ, Walker PM, Wollersheim HJ, Woods PJ. (2014) 'Half-life systematics across the N=126 shell closure: role of first-forbidden transitions in the β decay of heavy neutron-rich nuclei.'. Phys Rev Lett, United States: 113 (2)

    Abstract

    This Letter reports on a systematic study of β-decay half-lives of neutron-rich nuclei around doubly magic (208)Pb. The lifetimes of the 126-neutron shell isotone (204)Pt and the neighboring (200-202)Ir, (203)Pt, (204)Au are presented together with other 19 half-lives measured during the "stopped beam" campaign of the rare isotope investigations at GSI collaboration. The results constrain the main nuclear theories used in calculations of r-process nucleosynthesis. Predictions based on a statistical macroscopic description of the first-forbidden β strength reveal significant deviations for most of the nuclei with N<126. In contrast, theories including a fully microscopic treatment of allowed and first-forbidden transitions reproduce more satisfactorily the trend in the measured half-lives for the nuclei in this region, where the r-process pathway passes through during β decay back to stability.

  • Niţǎ CR, Bucurescu D, Mǎrginean N, Avrigeanu M, Cǎta-Danil G, Deleanu D, Filipescu D, Ghiţǎ DG, Glodariu T, Mihai C, Mǎrginean R, Negret A, Pantelicǎ D, Sava T, Stroe L, Toma S, Bocchi G, Bottoni S, Bracco A, Coló G, Leoni S, Bruce AM, Mason PJR, Podolyak Z, Regan PH, Wilson E, Ur CA. (2014) 'Fast-timing lifetime measurements of excited states in Cu 67'. Physical Review C - Nuclear Physics, 89 (6)

    Abstract

    The half-lives of the 9/2+, 13/2+, and 15/2+ yrast states in the neutron-rich Cu67 nucleus were determined by using the in-beam fast-timing technique. The experimentally deduced E3 transition strength for the decay of the 9/2+ level to the 3/2- ground state indicates that the wave function of this level might contain a collective component arising from the coupling of the odd proton p3/2 with the 3- state in Ni66. Theoretical interpretations of the 9/2+ state are presented within the particle-vibration weak-coupling scheme involving the unpaired proton and the 3- state from Ni66 and within shell-model calculations with a Ni56 core using the jj44b residual interaction. The shell model also accounts reasonably well for the other measured electromagnetic transition probabilities. © 2014 American Physical Society.

  • Roberts OJ, Bruce AM, Regan PH, Podolyák Z, Townsley CM, Smith JF, Mulholland KF, Smith A. (2014) 'A LaBr: Ce fast-timing array for DESPEC at FAIR'. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 748, pp. 91-95.

    Abstract

    The design of a fast-timing γ-ray detection array aimed at measuring sub-nanosecond half-lives using LaBr:Ce scintillation crystals is presented. This array will complement novel and existing charged particle and neutron detector arrays at the low-energy branch of a fragment separator (Super-FRS) to be built within the NuSTAR collaboration as part of the future Facility for Anti-proton and Ion Research (FAIR). The array will be used in conjunction with the Advanced Implantation Detector Array (AIDA), to measure implant-decay correlations. Monte-Carlo simulations have been performed to determine the design of the proposed fast-timing array around a localised implantation point. In particular, simulations were used to determine the full-energy peak efficiencies for single cylindrical, conical and 'hybrid' detector geometries, as well as complete array configurations of 'hybrid' and â̂...1.5 in.×2 in. cylindrical crystals. Timing precision calculations were then used to determine the timing response for each configuration based on its simulated efficiency. An informed decision based on the simulated efficiencies and timing precision calculations allowed the optimum configuration for the array to be determined. © 2014 Elsevier B.V.

  • Alharbi T, Regan PH, Podolyák Z, Bajoga A, Britton R, Patel Z, Townsley C, Mǎrginean N, Bucurescu D, Deleanu D, Filipescu D, Ghitǎ D, Glodariu T, Mihai C, Mǎrginean R, Negret A, Nita CR, Stroe L, Sava T, Zamfir NV, Mulholland K, Roberts OJ. (2014) 'Sub-nanosecond Half-life Measurement of the Yrast I=5 State in the N=78 Nucleus Ce58136 using Fast-timing Coincident Gamma-ray Spectroscopy'. Nuclear Data Sheets, 120, pp. 59-61.

    Abstract

    We report on the measurement of the half-life of the yrast I=5 state in the transitional nucleus Ce using a combined HPGe-LaBr3(Ce) scintillator gamma-ray detection array. The measured value for the E1 decay is approximately half a nanosecond, which corresponds to an E1 decay strength of approximately 2×10 Wu. This value is in line with single-particle type E1 decays in this mass region and suggests no sign of additional K-hindrance associated with axially symmetric quadrupole deformations observed for lighter cerium isotopes. © 2014 Elsevier Inc.

  • Britton R, Regan PH, Burnett JL, Davies AV. (2014) 'Monte Carlo characterisation of a Compton suppressed broad-energy HPGe detector'. Journal of Radioanalytical and Nuclear Chemistry, 300 (3), pp. 1253-1259.

    Abstract

    GEANT4 Monte Carlo simulations have been successfully utilised to characterise a Compton suppressed broad-energy HPGe detector. The detector setup has been fully recreated in the simulation, which has been optimised to consistently reproduce the detector response. The peak efficiencies for both the primary BEGe detector and NaI(Tl) guard detectors agree with the simulated values for multiple test sources within 3 %. Compton suppression has also been simulated, with good agreement seen between the simulated and actual CSF values (<10 %) for multiple radionuclides. A secondary reference source was also simulated, which contained up to 30 radionuclides in a different geometry to that of the previous source. This showed excellent agreement with experimental data in both unsuppressed and suppressed modes of operation. © 2014 Akadémiai Kiadó.

  • Algora A, Valencia E, Taín JL, Jordan MD, Agramunt J, Rubio B, Estevez E, Molina F, Montaner A, Guadilla V, Fallot M, Porta A, Zakari-Issoufou A-A, Bui VM, Rice S, Podolyák Z, Regan PH, Gelletly W, Bowry M, Mason P, Farrelly GF, Rissanen J, Eronen T, Moore I, Penttilä H, Äystö J, Eloma V, Hakala J, Jokinen A, Kolkinen V, Reponen M, Sonnenschein V, Cano-Ott D, Martínez T, Mendoza E, Garcia AR, Gomez-Hornillos MB, Gorlychev V, Caballero-Folch R, Kondev FG, Sonzogni AA. (2014) 'Total Absorption Study of Beta Decays Relevant for Nuclear Applications and Nuclear Structure'. Nuclear Data Sheets, 120, pp. 12-15.

    Abstract

    An overview is given of our activities related to the study of the beta decay of neutron rich nuclei relevant for nuclear applications. Recent results of the study of the beta decay of Br using a new segmented total absorption spectrometer are presented. The measurements were performed at the IGISOL facility using trap-assisted total absorption spectroscopy. © 2014 Elsevier Inc..

  • Jerome SM, Ivanov P, Larijani C, Parker DJ, Regan PH. (2014) 'The production of Neptunium-236g.'. J Environ Radioact,

    Abstract

    Radiochemical analysis of (237)Np is important in a number of fields, such as nuclear forensics, environmental analysis and measurements throughout the nuclear fuel cycle. However analysis is complicated by the lack of a stable isotope of neptunium. Although various tracers have been used, including (235)Np, (239)Np and even (236)Pu, none are entirely satisfactory. However, (236g)Np would be a better candidate for a neptunium yield tracer, as its long half-life means that it is useable as both a radiometric and mass spectrometric measurements. This radionuclide is notoriously difficult to prepare, and limited in scope. In this paper, we examine the options for the production of (236g)Np, based on work carried out at NPL since 2011. However, this work was primarily aimed at the production of (236)Pu, and not (236g)Np and therefore the rate of production are based on the levels of (236)Pu generated in the irradiation of (i) (238)U with protons, (ii) (235)U with deuterons, (iii) (236)U with protons and (iv) (236)U with deuterons. The derivation of a well-defined cross section is complicated by the relevant paucity of information on the variation of the (236m)Np:(236g)Np production ratio with incident particle energy. Furthermore, information on the purity of (236g)Np so produced is similarly sparse. Accordingly, the existing data is assessed and a plan for future work is presented.

  • Britton R, Burnett JL, Davies AV, Regan PH. (2014) 'Maximising the sensitivity of a γ spectrometer for low-energy, low-activity radionuclides using Monte Carlo simulations.'. J Environ Radioact, England: 134, pp. 1-5.

    Abstract

    Monte-Carlo simulations have been utilised to determine the optimum material and thickness for a γ spectrometer to be used for the assay of radionuclides that emit radiation in the 50-300 keV energy range. Both HPGe and LaBr3(Ce) materials were initially considered for use, however the additional background radiation and lack of resolution in the latter drove the selection of HPGe for further optimisation. Multiple thicknesses were considered for the HPGe detector, with the aim of improving the sensitivity of the system by maximising the efficiency for low energy emissions, and reducing the probability of interaction with (and therefore the continuum from) higher energy photons. The minimum amount of material needed to achieve this was found to be 15 mm for a source that is dominated by high energy (>2.614 MeV) photons, and 20-30 mm for a typical reference source (with photons of energy 59.54 keV-2.614 MeV).

  • Habib AS, Regan PH, Bradley DA, Matthews MC, Shutt AL, Alsulaiti H. (2014) 'Characterization of naturally occurring radioactive materials in Libyan oil pipe scale using a germanium detector and Monte Carlo simulation'. Radiation Physics and Chemistry, 95, pp. 352-355.

    Abstract

    Radioactive scale formation in various oil production facilities is acknowledged to pose a potential significant health and environmental issue. The presence of such an issue in Libyan oil fields was recognized as early as 1998. The naturally occurring radioactive materials (NORM) involved in this matter are radium isotopes (Ra and Ra) and their decay products, precipitating into scales formed on the surfaces of production equipment. A field trip to a number of onshore Libyan oil fields has indicated the existence of elevated levels of specific activity in a number of locations in some of the more mature oil fields. In this study, oil scale samples collected from different parts of Libya have been characterized using gamma spectroscopy through use of a well shielded HPGe spectrometer. To avoid potential alpha-bearing dust inhalation and in accord with safe working practices at this University, the samples, contained in plastic bags and existing in different geometries, are not permitted to be opened. MCNP, a Monte Carlo simulation code, is being used to simulate the spectrometer and the scale samples in order to obtain the system absolute efficiency and then to calculate sample specific activities. The samples are assumed to have uniform densities and homogeneously distributed activity. Present results are compared to two extreme situations that were assumed in a previous study: (i) with the entire activity concentrated at a point on the sample surface proximal to the detector, simulating the sample lowest activity, and; (ii) with the entire activity concentrated at a point on the sample surface distal to the detector, simulating the sample highest activity. © 2013 Elsevier Ltd.

  • Morales AI, Benzoni G, Blasi N, Bracco A, Camera F, Crespi FCL, Corsi A, Leoni S, Million B, Nicolini R, Wieland O, Gottardo A, Valiente-Dobón JJ, De Angelis G, Napoli DR, Sahin E, Lunardi S, Gadea A, Algora A, Bazzacco D, Farnea E, Menegazzo R, Mengoni D, Recchia F, Ur CA, Górska M, Pietri S, Boutachkov P, Weick H, Cortes ML, Domingo-Pardo C, Engert T, Farinon F, Geissel H, Gerl J, Goel N, Gregor E, Habermann T, Hoischen R, Kojouharov I, Kurz N, Naqvi F, Nociforo C, Prochazka A, Prokopowicz W, Schaffner H, Sharma A, Wollersheim H-J, Regan PH, Podolyák Z, Al-Dahan N, Alkhomashi N, Bowry M, Bunce M, Deo AY, Farrelly GF, Reed MW, Swan TPD, Walker PM, Pfützner M, Grebosz J, Bruce AM, Bacelar AMD, Núñez JA, Ayyad Y, Benlliure J, Allegro PRP, Ribas RV, Casarejos E, Doncel M, Dombradi Z, Eppinger K, Steiger K, Rudolph D, Janik R, Sitar B, Strmen P, Szarka I, Klupp S, Mandal S, Siwal D. (2014) 'β -decay studies of neutron-rich Tl, Pb, and Bi isotopes'. Physical Review C - Nuclear Physics, 89 (1)

    Abstract

    The fragmentation of relativistic uranium projectiles has been exploited at the Gesellschaft für Schwerionenforschung laboratory to investigate the β decay of neutron-rich nuclei just beyond 208Pb. This paper reports on β-delayed γ decays of 211-213Tl, 215Pb, and 215-219Bi de-exciting states in the daughters 211-213Pb, 215Bi, and 215-219Po. The resulting partial level schemes, proposed with the help of systematics and shell-model calculations, are presented. The role of allowed Gamow-Teller and first-forbidden β transitions in this mass region is discussed. © 2014 American Physical Society.

  • Britton R, Regan PH, Burnett JL, Davies AV. (2014) 'Monte Carlo characterisation of a Compton suppressed broad-energy HPGe detector'. Journal of Radioanalytical and Nuclear Chemistry, , pp. 1-7.

    Abstract

    GEANT4 Monte Carlo simulations have been successfully utilised to characterise a Compton suppressed broad-energy HPGe detector. The detector setup has been fully recreated in the simulation, which has been optimised to consistently reproduce the detector response. The peak efficiencies for both the primary BEGe detector and NaI(Tl) guard detectors agree with the simulated values for multiple test sources within 3 %. Compton suppression has also been simulated, with good agreement seen between the simulated and actual CSF values (<10 %) for multiple radionuclides. A secondary reference source was also simulated, which contained up to 30 radionuclides in a different geometry to that of the previous source. This showed excellent agreement with experimental data in both unsuppressed and suppressed modes of operation. © 2014 Akadémiai Kiadó, Budapest, Hungary.

  • Zakari-Issoufou A-A, Porta A, Fallot M, Bui VM, Algora A, Tain JL, Valencia E, Agramunt J, Estévez E, Jordan MD, Molina F, Perez A, Rubio B, Rice S, Bowry M, Farrelly GF, Gelletly W, Podolyak Z, Regan PH, Äystö J, Eloma V, Hakala J, Jokinen A, Kankainen A, Moore I, Penttilä H, Rissanen J, Weber C, Cano-Ott D, Garcia A, Martinez T, Mendoza E, Caballero-Folch R, Gomez-Hornillos MB, Gorlychev V, Kondev FG. (2014) 'Results of fission products β decay properties measurement performed with a total absorption spectrometer'. EPJ Web of Conferences, 66

    Abstract

    β-decay properties of fission products are very important for applied reactor physics, for instance to estimate the decay heat released immediately after the reactor shutdown and to estimate the ν flux emitted. An accurate estimation of the decay heat and the ν emitted flux from reactors, are necessary for purposes such as reactors operation safety and non-proliferation. In order to improve the precision in the prediction for these quantities, the bias due to the Pandemonium effect affecting some important fission product data has to be corrected. New measurements of fission products β-decay, not sensitive to this effect, have been performed with a Total Absorption Spectrometer (TAS) at the JYFL facility of Jyväskylä. An overview of the TAS technique and first results from the 2009 campaign will be presented. © Owned by the authors, published by EDP Sciences, 2014.

  • Wilson E, Podolyák Z, Bowry M, Bunce M, Kempley RS, Reed MW, Regan PH, Walker PM, Fornal B, Cieplicka N, Szpak B, Janssens RVF, Carpenter MP, Chiara CJ, Hoffman CR, Lauritsen T, Zhu S, Deo AY, Dracoulis GD, Lane GJ, Grawe H, Kondev FG, Rodríguez Triguero C. (2014) 'Study of Tl produced in deep-inelastic reactions'. EPJ Web of Conferences, 66

    Abstract

    Deep-inelastic collisions of a Pb beam on a Pb target were performed using the ATLAS accelerator at Argonne National Laboratory. The Gammasphere detector array was used for the detection of prompt and delayed gamma-rays of the reaction products.Tl is one proton away from the 208Pb doubly-magic nucleus. Its low-energy level structure is dominated by the single proton-hole states πs , πd and πh . The 11/2 state is isomeric with T = 1.33(11) s. The reaction partner of Tl is Bi, which has arelatively well established level scheme compared to Tl. Cross-coincidences between these two nuclei were used to confirm or establish levels above the 11/2 isomeric state in Tl. These states are obtained via breaking of the neutron core. Angular correlation analysis was performed on known transitions in Pb, proving the applicability of this method for multipolarity assignment. © Owned by the authors, published by EDP Sciences, 2014.

  • Valencia E, Algora A, Tain JL, Agramunt J, Estevez E, Jordan MD, Molina F, Perez A, Rubio B, Rice S, Bowry M, Farrelly GF, Gelletly W, Podolyak Z, Zakari-Issoufou A-A, Bui VM, Fallot M, Porta A, Äystö J, Eloma V, Eronen T, Hakala J, Jokinen A, Kankainen A, Moore I, Penttilä H, Rissanen J, Weber C, Caballero-Folch R, Gomez-Hornillos MB, Gorlychev V, Cano-Ott D, Garcia A, Martinez T, Mendoza E, Kondev FG, Regan PH. (2014) 'Gamma/neutron competition above the neutron separation energy in delayed neutron emitters'. EPJ Web of Conferences, 66

    Abstract

    To study the β-decay properties of some well known delayed neutron emitters an experiment was performed in 2009 at the IGISOL facility (University of Jyväskylä in Finland) using Total Absorption -ray Spectroscopy (TAGS) technique. The aim of these measurements is to obtain the full β-strength distribution below the neutron separation energy (S) and the γ/neutron competition above. This information is a key parameter in nuclear technology applications as well as in nuclear astrophysics and nuclear structure. Preliminary results of the analysis show a significant γ-branching ratio above S. © Owned by the authors, published by EDP Sciences, 2014.

  • Gottardo A, Valiente-Dobón JJ, De Angelis G, Modamio V, Napoli DR, Sahin E, Lunardi S, John PR, Lenzi SM, Benzoni G, Gadea A, Algora A, Bracco A, Camera F, Crespi FCL, Corsi A, Leoni S, Million B, Morales AI, Nicolini R, Wieland O, Allegro PRP, Bazzacco D, Farnea E, Menegazzo R, Mengoni D, Recchia F, Ur CA, Boutachkov P, Górska M, Pietri S, Weick H, Cortes ML, Domingo-Pardo C, Engert T, Farinon F, Geissel H, Gerl J, Goel N, Gregor E, Habermann T, Hoischen R, Kojouharov I, Kurz N, Naqvi F, Nociforo C, Prochazka A, Prokopowicz W, Schaffner H, Sharma A, Wollersheim H-J, Bruce AM, Bunce M, Bacelar AMD, Grebosz J, Podolyák Z, Regan PH, Al-Dahan N, Bowry M, Deo AY, Farrelly GF, Reed MW, Swan TPD, Walker PM, Pfützner M, Núñez JA, Ayyad Y, Benlliure J, Alkhomashi N, Ribas RV, Casarejos E, Doncel M, Dombradi Z, Eppinger K, Klupp S, Steiger K, Rudolph D, Janik R, Sitar B, Strmen P, Szarka I, Mandal S, Siwal D. (2014) 'New isomers in the neutron-rich region beyond Pb'. EPJ Web of Conferences, 66

    Abstract

    The region of neutron-rich nuclei beyond Pb has been very difficult to explore due to its high mass and exoticity. However, recent experimental improvements allowed one to perform a quite extended isomer decay spectroscopy of these nuclei. © Owned by the authors, published by EDP Sciences, 2014.

  • Britton R, Regan PH, Burnett JL, Davies AV. (2014) 'Characterisation of cascade summing effects in gamma spectroscopy using Monte Carlo simulations'. Journal of Radioanalytical and Nuclear Chemistry, 299 (1), pp. 447-452.

    Abstract

    A GEANT4 based Monte Carlo simulation has been successfully utilised to calculate peak efficiency characterisations and cascade summing (true coincidence summing) corrections in two source geometries commonly used for environmental monitoring. The cascade summing corrections are compared with values generated using an existing (validated) system, and found to be in excellent agreement for all radionuclides simulated. The calculated correction factors and peak efficiencies were also tested by analysing well defined sources used in the operation of the International Monitoring System, which undertakes radionuclide monitoring for verification of the Comprehensive Nuclear-Test-Ban Treaty. All abundances of the radionuclides measured matched the values that were previously determined using proprietary software. Using GEANT4 in this way, cascade summing corrections can now be extended to complex detector models and source matrices, such as Compton Suppression systems. © 2013 Akadémiai Kiadó, Budapest, Hungary.

  • Britton R, Regan PH, Burnett JL, Davies AV. (2013) 'Monte-Carlo based background reduction and shielding optimisation for a large hyper-pure germanium detector'. Journal of Radioanalytical and Nuclear Chemistry, 298 (3), pp. 1491-1499.

    Abstract

    The performance of a radiation shielding system for a hyper-pure germanium detector has been characterised for Terrestrial radiation sources, Cosmic muons, X-ray fluorescence and the Compton scattering of source photons. Several methods to reduce the background seen are quantified, including increasing the inner radius of the Pb cave, and increasing the thickness of the shielding. Substantial improvements in the reduction of fluorescence X-rays are found to be achievable by modifying the liner thicknesses used. Increasing the Sn liner from 1.5 to 2.5 mm will increase the shielding of Pb X-rays from 95 to 99.5 %. Reducing the Cu liner from 1.0 to 0.5 mm maintains a 99.5 % level of shielding for Sn/Cd X-rays, however it greatly reduces the amount of Compton scattering of source photons into the detector (a process that is shown to cause an order of magnitude more events in the background than X-ray fluorescence). Cosmic muons were found to increase the amount of background radiation seen, both through direct interaction and the production of secondary radiation. The Cosmic muon contribution, however, was found to produce a much smaller effect than that caused by Terrestrial radiation and Compton scattered photons/fluorescence from the source. The total level of background radiation entering the detector chamber was found to decrease up to the full 200 mm of Pb shielding simulated. © 2013 Akadémiai Kiadó, Budapest, Hungary.

  • Mason PJR, Podolyák Z, Regan PH, Stevenson PD, Alexander T, Alharbi T, Bowry M, Britton R, Bunce M, Gelletly W, Rice S, Townsley C, Wilson E, Wood RT, Mǎrginean N, Bucurescu D, Cǎta-Danil G, Cǎta-Danil I, Deleanu D, Delion D, Filipescu D, Ghiţǎ D, Gheorghe I, Glodariu T, Lica R, Mǎrginean R, Mihai C, Nita CR, Negret A, Pascu S, Sava T, Stroe L, Suliman G, Suvaila R, Toma S, Werner V, Cooper N, Ilie G, Zhou C, Algora A, Bruce AM, Roberts OJ, Ivanova D, Kisyov S, Lalkovski S, Zhekova M, Liddick SN, Mulholland K, Smith JF, Söderström P-A. (2013) 'Half-life of the yrast 2 state in 188W: Evolution of deformation and collectivity in neutron-rich tungsten isotopes'. Physical Review C - Nuclear Physics, 88 (4)

    Abstract

    The half-life of the yrast Iπ=2 state in the neutron-rich nucleus 188W has been measured using fast-timing techniques with the HPGe and LaBr:Ce array at the National Institute of Physics and Nuclear Engineering, Bucharest. The resulting value of t=0.87(12) ns is equivalent to a reduced transition probability of B(E2;21+→01+)=85(12) W.u. for this transition. The B(E2;21+→01+) is compared to neighboring tungsten isotopes and nuclei in the Hf, Os, and Pt isotopic chains. Woods-Saxon potential energy surface (PES) calculations have been performed for nuclei in the tungsten isotopic chain and predict prolate deformed minima with rapidly increasing γ softness for 184192W and an oblate minimum for 194W. © 2013 American Physical Society.

  • Gottardo A, Valiente-Dobón JJ, de Angelis G, Modamio V, Napoli DR, Sahin E, Lunardi S, Algora A, John PR, Lenzi SM, Benzoni G, Bracco A, Camera F, Crespi FCL, Corsi A, Leoni S, Million B, Morales AI, Nicolini R, Wieland O, Gadea A, Bazzacco D, Farnea E, Menegazzo R, Mengoni D, Recchia F, Ur CA, Boutachkov P, Górska M, Pietri S, Weick H, Cortes ML, Domingo-Pardo C, Engert T, Farinon F, Geissel H, Gerl J, Goel N, Gregor E, Habermann T, Hoischen R, Kojouharov I, Kurz N, Naqvi F, Nociforo C, Prochazka A, Prokopowicz W, Schaffner H, Sharma A, Wollersheim H-J, Bruce AM, Bunce M, Denis Bacelar AM, Grebosz J, Podolyák Z, Regan PH, Al-Dahan N, Bowry M, Deo AY, Farrelly GF, Reed MW, Swan TPD, Walker PM, Pfützner M, Ayyad Y, Benlliure J, Alcántara Núñez J, Alkhomashi N, Allegro PRP, Ribas RV, Casarejos E, Doncel M, Dombradi Z, Eppinger K, Klupp S, Steiger K, Rudolph D, Janik R, Sitar B, Strmen P, Szarka I, Mandal S, Siwal D. (2013) 'New μs isomers in the neutron-rich Hg nucleus'. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 725 (4-5), pp. 292-296.

    Abstract

    Neutron-rich nuclei in the lead region, beyond N=126, have been studied at the FRS-RISING setup at GSI, exploiting the fragmentation of a primary uranium beam. Two isomeric states have been identified in Hg: the 8 isomer expected from the seniority scheme in the νg shell and a second one at low spin and low excitation energy. The decay strength of the 8 isomer confirms the need of effective three-body forces in the case of neutron-rich lead isotopes. The other unexpected low-lying isomer has been tentatively assigned as a 3 state, although this is in contrast with theoretical expectations. © 2013 Elsevier B.V..

  • Bowry M, Podolyak Z, Pietri S, Kurcewicz J, Bunce M, Regan PH, Farinon F, Geissel H, Nociforo C, Prochazka A, Weick H, Al-Dahan N, Alkhomashi N, Allegro PRP, Benlliure J, Benzoni G, Boutachkov P, Bruce AM, Bacelar AMD, Farrelly GF, Gerl J, Gorska M, Gottardo A, Grebosz J, Gregor N, Janik R, Knoebel R, Kojouharov I, Kubo T, Kurz N, Litvinov YA, Merchan E, Mukha I, Naqvi F, Pfeiffer B, Pfuetzner M, Plass W, Pomorski M, Riese B, Ricciardi MV, Schmidt K-H, Schaffner H, Scheidenberger C, Simpson EC, Sitar B, Spiller P, Stadlmann J, Strmen P, Sun B, Tanihata I, Terashima S, Dobon JJV, Winfield JS, Wollersheim H-J, Woods PJ. (2013) 'Population of high-spin isomeric states following fragmentation of U-238'. PHYSICAL REVIEW C, 88 (2) Article number ARTN 024611
  • Lalkovski S, Bruce AM, Bacelar AMD, Gorska M, Pietri S, Podolyak Z, Bednarczyk P, Caceres L, Casarejos E, Cullen IJ, Doornenbal P, Farrelly GF, Garnsworthy AB, Geissel H, Gelletly W, Gerl J, Grebosz J, Hinke C, Ilie G, Ivanova D, Jaworski G, Kisyov S, Kojouharov I, Kurz N, Minkov N, Myalski S, Palacz M, Petkov P, Prokopowicz W, Regan PH, Schaffner H, Steer S, Tashenov S, Walker PM, Wollersheim HJ. (2013) 'Submicrosecond isomer in Rh-117(45)72 and the role of triaxiality in its electromagnetic decay rate'. PHYSICAL REVIEW C, 88 (2) Article number ARTN 024302
  • Morales AI, Benlliure J, Verma S, Casarejos E, Álvarez-Pol H, Estévez-Aguado ME, Górska M, Grawe H, Boutachkov P, Cáceres LS, Doornenbal P, Gerl J, Grebosz J, Kojouharov I, Kurz N, Prokopowicz W, Schaffner H, Tashenov S, Wollersheim HJ, Regan PH, Podolyák Z, Pietri S, Alkhomashi N, Cullen IJ, Farrelly G, Garnsworthy AB, Gelletly W, Steer SJ, Walker PM, Kumar R, Algora A, Molina F, Rubio B, Benzoni G, Blazhev A, Mücher D, Bruce AM, Denis Bacelar AM, Lalkovski S, Fujita Y, Hoischen R, Liu Z, Woods PJ, Mihai C, Tamii A, Valiente-Dobón JJ. (2013) 'β-delayed γ-ray spectroscopy of 203204Au and 200202Pt'. Physical Review C - Nuclear Physics, 88 (1)

    Abstract

    The β decay of five heavy, neutron-rich nuclei, 203204Pt and 200202Ir, has been investigated following relativistic cold fragmentation reactions of lead projectiles using the FRS+RISING setup at GSI. This paper reports on the study of the low-lying states in the decay daughter nuclei 203204Au and 200202Pt. The characteristic γ rays for each nucleus have been determined using β-delayed γ-ray spectroscopy. Tentative level schemes, relative intensities, and apparent β feedings are provided. These data are compared with shell-model calculations, which indicate a substantial contribution to the total β strength from high-energy first-forbidden β-decay transitions in this mass region. © 2013 American Physical Society.

  • Denis Bacelar AM, Bruce AM, Lalkovski S, Podolyák Z, Al-Dahan N, Alkhomashi N, Cullen IJ, Deo AY, Farrelly GF, Gelletly W, Regan PH, Steer SJ, Swan TPD, Walker PM, Górska M, Pietri S, Ricciardi MV, Boutachkov P, Domingo-Pardo C, Farinon F, Geissel H, Gerl J, Goel N, Grȩbosz J, Hoischen R, Kojouharov I, Kurz N, Nociforo C, Prochazka A, Prokopowicz W, Schmidt K-H, Schaffner H, Weick H, Wollersheim HJ, Detistov P, Algora A, Molina F, Rubio B, Dombradi Z, Benlliure J, Morales AI, Verma S, Bracco A, Leoni S, Montanari D, Nicolini R, Calore E, Napoli DR, Valiente-Dobón JJ, Casarejos E, Doncel M, Rudolph D, Musumarra A, Steiger K, Strmen P, Szarka I. (2013) 'The population of metastable states as a probe of relativistic-energy fragmentation reactions'. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 723 (4-5), pp. 302-306.

    Abstract

    Isomeric ratios have been measured for high-spin states in Po84198,200,206,208, At85208,209,210,211, Rn86210,211,212,213,214, Fr87208,211,212,213,214, Ra88210,211,212,214,215, and Ac89215 following the projectile fragmentation of a 1 AGeV U beam by a Be target at GSI Helmholtzzentrum für Schwerionenforschung. The fragments were separated in the fragment separator (FRS) and identified by means of energy loss and time-of-flight techniques. They were brought to rest at the centre of the RISING gamma-ray detector array and intensities of gamma rays emitted in the decay of isomeric states with half-lives between 100 ns and 40 μs and spin values up to 55/2ℏ were used to obtain the corresponding isomeric ratios. The data are compared to theoretical isomeric ratios calculated in the framework of the abrasion-ablation model. Large experimental enhancements are obtained for high-spin isomers in comparison to expected values. © 2013 Elsevier B.V.

  • Bunce M, Regan PH, Anagnostatou V, Bowry M, Goddard PM, Mason PJR, Reed MW, Ross TJ, Simpson EC, Werner V, Cooper N, Ilie G, Beausang CW, Chen D, Hughes RO, Pauerstein B, Casperson RJ. (2013) 'High-spin study of the shell model nucleus 88Y'. Physical Review C - Nuclear Physics, 87 (4)

    Abstract

    The near-yrast structure of the near-magic, odd-odd nucleus, 3988Y , has been studied into the high-spin regime. Investigations were performed at the Wright Nuclear Structure Laboratory, Yale University, using the 74Ge(18O,p3n) and 76Ge(18O,p5n) fusion-evaporation reactions at beam energies of 60 and 90 MeV, respectively. Gamma-ray energy coincidence analyses using both double (γ2) and triple (γ3) fold coincidences, together with angular correlation measurements, have been used to extend the previously reported level scheme to an excitation energy of 8.6 MeV and a spin and parity of 19. The presented level scheme is compared with predictions of a truncated valence space shell-model calculation, which assumes an inert 56Ni core with proton and neutron excitations allowed within the f, p, p, and g single-particle states. The shell-model calculations show a reasonable comparison with the experimental data for the yrast, positive-parity states up to spin 18 â, with larger variations evident for negative-parity states with spins greater than 16. In spite of a significant increase in angular momentum input associated with the thin target 76Ge(18O,p5n) reaction channel, as compared to the backed target data using the 74Ge target, no additional discrete states were identified in the former data set, suggesting that the level scheme for this nucleus fragments significantly above the observed states, possibly indicating cross-shell excitations becoming dominant for I>19. © 2013 American Physical Society.

  • Lalkovski S, Kisyov S, Zhekova M, Bruce AM, Denis Bacelar AM, Jungclaus A, Modamio V, Walker J, Górska M, Cáceres L, Naqvi F, Pietri S, Bednarczyk P, Beck T, Cuenca-García JJ, Doornenbal P, Geissel H, Gerl J, Grebosz J, Hoischen R, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Schaffner H, Tashenov S, Weick H, Wollersheim HJ, Pfützner M, Ilie G, Jolie J, Reiter P, Podolyák Z, Cullen IJ, Farrelly GF, Garnsworthy AB, Gelletly W, Regan PH, Steer SJ, Walker PM, Simpson GS, Andgren K, Cederwall B, Hadinia B, Khaplanov A, Kmiecik M, Maj A, Myalski S, Benlliure J, Benzoni G, Crespi FCL, Wieland O, Casarejos E, Detistov P, Hellström M, Rudolph D, Hinke C, Jaworski G, Palacz M, Kumar R, Mandal S, Sohler D, Werner-Malento E. (2013) 'Core-coupled states and split proton-neutron quasiparticle multiplets in 122126Ag'. Physical Review C - Nuclear Physics, 87 (3)

    Abstract

    Neutron-rich silver isotopes were populated in the fragmentation of a 136Xe beam and the relativistic fission of 238U. The fragments were mass analyzed with the GSI Fragment Separator and subsequently implanted into a passive stopper. Isomeric transitions were detected by 105 high-purity germanium detectors. Eight isomeric states were observed in 122126Ag nuclei. The level schemes of 122123125Ag were revised and extended with isomeric transitions being observed for the first time. The excited states in the odd-mass silver isotopes are interpreted as core-coupled states. The isomeric states in the even-mass silver isotopes are discussed in the framework of the proton-neutron split multiplets. The results of shell-model calculations, performed for the most neutron-rich silver nuclei are compared to the experimental data. © 2013 American Physical Society.

  • Britton R, Regan PH, Burnett J, Davies A. (2013) 'Determining the efficiency of a broad-energy HPGe detector using Monte Carlo simulations'. Journal of Radioanalytical and Nuclear Chemistry, 295 (3), pp. 2035-2041.

    Abstract

    Broad-energy HPGe detectors have a useful range of 3 keV to 3 MeV, making them ideal for the assay of environmental samples. Such measurements however, are hindered by variations in the sample matrix, summing effects, and the Compton continuum. Detectors may be characterised by proprietary software in such a situation, however Monte-Carlo modelling is a useful, inexpensive alternative that also provides greater flexibility when determining the detector response and efficiency during a measurement. In the current work, a full GEANT4 model of a broad-energy HPGe detector is presented, and simulations of various samples are compared to experimental data. These are found to be accurate within 3 % at a confidence level of 95 % for energies from 30 to 3,000 keV, with greater variations below 100 keV due to an increased sensitivity to geometrical inaccuracies. © 2012 Akadémiai Kiadó, Budapest, Hungary.

  • Wilson E, Podolyák Z, Bowry M, Bunce M, Kempley RS, Reed MW, Regan PH, Walker PM, Fornal B, Cieplicka N, Szpak B, Janssens RVF, Carpenter MP, Chiara CJ, Hoffman CR, Lauritsen T, Zhu S, Deo AY, Dracoulis GD, Lane GJ, Grawe H, Kondev FG, Rodríguez Triguero C. (2013) 'Core excitations across the neutron shell gap in Tl'. Acta Physica Polonica B, 44 (3), pp. 381-385.

    Abstract

    Deep-inelastic collisions of a Pb beam on a Pb target were performed using the ATLAS accelerator at Argonne National Laboratory. Prompt and delayed λ-rays from the reaction products were detected using the GAMMASPHERE detector array. The cross-coincidence method was used to identify transitions in Tl, by gating on λ-rays from its bettercharacterised reaction partner Bi. A number of new transitions were found in Tl.

  • Roberts OJ, Bruce AM, Browne F, Marginean N, Bucurescu D, Deleanu D, Delion D, Filipescu D, Gheorghe I, Ghia D, Glodariu T, Marginean R, Mihai C, Negret A, Nia C, Pascu S, Sava T, Stroe L, Toma S, Alexander T, Alharbi T, Mason PJR, Regan PH, Townsley C, Ivanova D, Kisyov S, Fraile L, Olaizola B, Mulholland K, Söderström P-A. (2013) 'Half-life measurements of excited states in Te, Xe'. Acta Physica Polonica B, 44 (3), pp. 403-406.

    Abstract

    The Li+Te reaction was used to populate excited states in Te and Xe. The experiment at the Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania, used an array of high-purity germanium (HPGe) and cerium-doped lanthanum bromide (LaBr3(Ce)) detectors to measure sub-nanosecond half-lives using fast-timing techniques. The half-lives of the yrast 4+ and 6+ levels were measured in the N = 80 nuclei Te and Xe, respectively. An upper limit of T1=2≤ 40 ps was assigned to the 4+ level in Te and T1=2 = 1075(155) ps was assigned to the 6+ level in Xe. The systematics of the B(E2) strengths around the N = 82 shell closure are discussed.

  • Alharbi T, Regan PH, Mason PJR, Podolyák Z, Simpson EC, Alazemi N, Britton R, Bunce MR, Gelletly W, Lintott J, Nakhostin M, Rice S, Townsley C, Wilson E, Mǎrginean N, Bucurescu D, Deleanu D, Filipescu D, Ghitǎ D, Glodariu T, Ilie G, Mihai C, Mǎrginean R, Negret A, Nita CR, Stroe L, Sava T, Zamfir NV, Bruce AM, Roberts OJ, Algora A, Cooper N, Werner V, Kisyov S, Lalkovski S, Zhekova M, Liddick S, Mulholland K, Smith JF. (2013) 'Electromagnetic transition rates in the N=80 nucleus 58138Ce'. Physical Review C - Nuclear Physics, 87 (1)

    Abstract

    The half-life of the Iπ=6 yrast state at E=2294 keV in 138Ce has been measured as T=880(19) ps using the fast-timing γ-ray coincidence method with a mixed LaBr(Ce)- HPGe array. The excited states in 138Ce have been populated by the 130Te(12C,4n) fusion-evaporation reaction at an incident beam energy of 56 MeV. The extracted B(E2;61+→41+)=0.101(24) W.u. value is compared with the predictions of truncated basis shell model calculations and with the systematics of the region. This shows an anomalous behavior compared to the neighboring isotonic and isotopic chains. Half-lives for the yrast 5, 11 and 14 states in 138Ce have also been determined in this work. © 2013 American Physical Society.

  • Valencia E, Algora A, Tain JL, Agramunt J, Jordan MD, Molina F, Estevez E, Rubio B, Perez A, Rice S, Bowry M, Gelletly W, Podolyak Z, Regan PH, Farrelly GF, Zakari-Issoufou A-A, Porta A, Fallot M, Bui VM, Caballero-Folch R, Gomez-Hornillos MB, Gorlychev V, Cano-Ott D, Garcia A, Martinez T, Mendoza E, Eloma V, Eronen T, Hakala J, Jokinen A, Moore I, Rissanen J, Äystö J, Penttilä H, Kankainen A, Weber C, Kondev FG. (2013) 'Total absorption γ-ray spectroscopy of beta delayed neutron emitters'. AIP Conference Proceedings, 1541, pp. 161-162.

    Abstract

    Preliminary results of the data analysis of the beta decay of Rb using a novel - segmented- total absorption spectrometer are shown in this contribution. This result is part of a systematic study of important contributors to the decay heat problem in nuclear reactors. In this particular case the goal is to determine the beta intensity distribution below the neutron separation energy and the gamma/beta competition above. © 2013 AIP Publishing LLC.

  • Britton R, Regan PH, Burnett JL, Davies AV. (2013) 'Monte-Carlo based background reduction and shielding optimisation for a large hyper-pure germanium detector'. Journal of Radioanalytical and Nuclear Chemistry, , pp. 1-9.

    Abstract

    The performance of a radiation shielding system for a hyper-pure germanium detector has been characterised for Terrestrial radiation sources, Cosmic muons, X-ray fluorescence and the Compton scattering of source photons. Several methods to reduce the background seen are quantified, including increasing the inner radius of the Pb cave, and increasing the thickness of the shielding. Substantial improvements in the reduction of fluorescence X-rays are found to be achievable by modifying the liner thicknesses used. Increasing the Sn liner from 1.5 to 2.5 mm will increase the shielding of Pb X-rays from 95 to 99.5 %. Reducing the Cu liner from 1.0 to 0.5 mm maintains a 99.5 % level of shielding for Sn/Cd X-rays, however it greatly reduces the amount of Compton scattering of source photons into the detector (a process that is shown to cause an order of magnitude more events in the background than X-ray fluorescence). Cosmic muons were found to increase the amount of background radiation seen, both through direct interaction and the production of secondary radiation. The Cosmic muon contribution, however, was found to produce a much smaller effect than that caused by Terrestrial radiation and Compton scattered photons/fluorescence from the source. The total level of background radiation entering the detector chamber was found to decrease up to the full 200 mm of Pb shielding simulated. © 2013 Akadémiai Kiadó, Budapest, Hungary.

  • Gottardo A, Valiente-Dobón JJ, de Angelis G, Modamio V, Napoli DR, Sahin E, Lunardi S, John PR, Lenzi SM, Benzoni G, Bracco A, Camera F, Crespi FCL, Corsi A, Leoni S, Million B, Morales AI, Nicolini R, Wieland O, Gadea A, Algora A, Bazzacco D, Farnea E, Menegazzo R, Mengoni D, Recchia F, Ur CA, Boutachkov P, Górska M, Pietri S, Weick H, Cortes ML, Domingo-Pardo C, Engert T, Farinon F, Geissel H, Gerl J, Goel N, Gregor E, Habermann T, Hoischen R, Kojouharov I, Kurz N, Naqvi F, Nociforo C, Prochazka A, Prokopowicz W, Schaffner H, Sharma A, Wollersheim H-J, Bruce AM, Bunce M, Denis Bacelar AM, Grebosz J, Podolyák Z, Regan PH, Al-Dahan N, Bowry M, Deo AY, Farrelly GF, Reed MW, Swan TPD, Walker PM, Pfützner M, Alcántara Núñez J, Ayyad Y, Benlliure J, Alkhomashi N, Allegro PRP, Ribas RV, Casarejos E, Doncel M, Dombradi Z, Eppinger K, Klupp S, Steiger K, Rudolph D, Janik R, Sitar B, Strmen P, Szarka I, Mandal S, Siwal D. (2013) 'New μs isomers in the neutron-rich Hg nucleus'. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics,

    Abstract

    Neutron-rich nuclei in the lead region, beyond N = 126, have been studied at the FRS-RISING setup at GSI, exploiting the fragmentation of a primary uranium beam. Two isomeric states have been identified in Hg: the 8 isomer expected from the seniority scheme in the ν g shell and a second one at low spin and low excitation energy. The decay strength of the 8 isomer confirms the need of effective three-body forces in the case of neutron-rich lead isotopes. The other unexpected low-lying isomer has been tentatively assigned as a 3 state, although this is in contrast with theoretical expectations. © 2013 Elsevier B.V. All rights reserved.

  • Britton R, Regan PH, Burnett JL, Davies AV. (2013) 'Characterisation of cascade summing effects in gamma spectroscopy using Monte Carlo simulations'. Journal of Radioanalytical and Nuclear Chemistry, , pp. 1-6.

    Abstract

    A GEANT4 based Monte Carlo simulation has been successfully utilised to calculate peak efficiency characterisations and cascade summing (true coincidence summing) corrections in two source geometries commonly used for environmental monitoring. The cascade summing corrections are compared with values generated using an existing (validated) system, and found to be in excellent agreement for all radionuclides simulated. The calculated correction factors and peak efficiencies were also tested by analysing well defined sources used in the operation of the International Monitoring System, which undertakes radionuclide monitoring for verification of the Comprehensive Nuclear-Test-Ban Treaty. All abundances of the radionuclides measured matched the values that were previously determined using proprietary software. Using GEANT4 in this way, cascade summing corrections can now be extended to complex detector models and source matrices, such as Compton Suppression systems. © 2013 Akadémiai Kiadó, Budapest, Hungary.

  • Denis Bacelar AM, Bruce AM, Lalkovski S, Podolyák Z, Al-Dahan N, Alkhomashi N, Cullen IJ, Deo AY, Farrelly GF, Gelletly W, Regan PH, Steer SJ, Swan TPD, Walker PM, Górska M, Pietri S, Ricciardi MV, Boutachkov P, Domingo-Pardo C, Farinon F, Geissel H, Gerl J, Goel N, Grȩbosz J, Hoischen R, Kojouharov I, Kurz N, Nociforo C, Prochazka A, Prokopowicz W, Schmidt K-H, Schaffner H, Weick H, Wollersheim HJ, Detistov P, Algora A, Molina F, Rubio B, Dombradi Z, Benlliure J, Morales AI, Verma S, Bracco A, Leoni S, Montanari D, Nicolini R, Calore E, Napoli DR, Valiente-Dobón JJ, Casarejos E, Doncel M, Rudolph D, Musumarra A, Steiger K, Strmen P, Szarka I. (2013) 'The population of metastable states as a probe of relativistic-energy fragmentation reactions'. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics,

    Abstract

    Isomeric ratios have been measured for high-spin states in Po, At, Rn, Fr, Ra, and Ac following the projectile fragmentation of a 1 A GeV U beam by a Be target at GSI Helmholtzzentrum für Schwerionenforschung. The fragments were separated in the fragment separator (FRS) and identified by means of energy loss and time-of-flight techniques. They were brought to rest at the centre of the RISING gamma-ray detector array and intensities of gamma rays emitted in the decay of isomeric states with half-lives between 100 ns and 40 μs and spin values up to 55 / 2 ℏ were used to obtain the corresponding isomeric ratios. The data are compared to theoretical isomeric ratios calculated in the framework of the abrasion-ablation model. Large experimental enhancements are obtained for high-spin isomers in comparison to expected values. © 2013 Elsevier B.V. All rights reserved.

  • Roberts OJ, Bruce AM, Patel Z, Podolyák Z, Regan PH, Townsley CM, Smith A, Mulholland KF, Smith JF. (2013) 'Development of a LaBr(Ce) Fast-timing Array for FAIR'. EPJ Web of Conferences, 63

    Abstract

    A γ-ray spectrometer with fast-timing capabilities, constructed of LaBr3(Ce:5%) detectors, is under development for use at the future Facility for Anti-proton and Ion Research (FAIR). The physics aims of this device are to measure the half-lives of excited states in the region of ∼50 ps to several ns, in exotic nuclei. Monte-Carlo simulations using the GEANT4 software package have determined the final design of this fast-timing array by calculating the full-energy peak efficiencies of several different detector geometries. The results of the simulated efficiencies for each configuration were used to calculate the timing precision. Consequently, an array of thirty six, ø3.8×5.1 cm cylindrical crystals was found to be the optimum configuration. The detectors were purchased and subsequently characterised, with each detector found to have intrinsic energy and timing resolutions of ∼ 2.8 % (FWHM) and ∼ 210 ps (FWHM) for the 1173 and 1332 keV decays from Co. © Owned by the authors, published by EDP Sciences, 2013.

  • Regan PH, Podolyák Z, Alharbi T, Mason PJR, Townsley C, Britton R, Patel Z, Nakhostin M, Rice S, Wilson E, Alazemi N, Bruce AM, Roberts OJ, Browne F, Mǎrginean N, Mǎrginean R, Ghitǎ D, Bucurescu D, Cata-Danil G, Deleanu D, Filipescu D, Glodariu T, Cata-Danil I, Mihai C, Negret A, Nita CR, Sava T, Stroe L, Suliman G, Mullholland K, Smith JF, Alkhomashi N, Detistov P, Garg U, Bender PC, Algora A, Liddick S, Cooper N, Werner V, Lalkovski S, Kisyov S, Söderström P-A, Watanabe H, Sumikama T. (2013) 'Precision lifetime measurements using LaBrdetectors with stable and radioactive beams'. EPJ Web of Conferences, 63

    Abstract

    A range of high resolution gamma-ray spectroscopy measurements have been carried out using arrays which include a number of Cerium-doped Lanthanum-Tribromide (LrBr(Ce)) scintillation detectors used in conjunction with high-resolution hyper-pure germanium detectors. Examples of the spectral and temporal responses of such set-ups, using both standard point radioactive sources Eu and Co, and in-beam fusionevaporation reaction experiments for precision measurements of nuclear excited states in P and Ce are presented. The current and future use of such arrays at existing (EURICA at RIKEN) and future (NUSTAR at FAIR) secondary radioactive beam facilities for precision measurements of excited nuclear state lifetimes in the 10 ps to 10 ns regime are also discussed. © Owned by the authors, published by EDP Sciences, 2013.

  • Britton R, Regan PH, Burnett J, Davies A. (2013) 'Preliminary simulations of NaI(Tl) detectors, and coincidence analysis using event stamping'. Journal of Radioanalytical and Nuclear Chemistry, 295 (1), pp. 573-577.

    Abstract

    This paper discusses preliminary work into the modelling and processing of coincidence measurements, for which a Monte-Carlo simulation and a post-processing program have both been developed. In the current work, a GEANT4 code is used to simulate a pair of NaI(Tl) scintillators, which are used experimentally to both develop the post-processing program and validate the GEANT4 model. This is found to be accurate to within 9 % at a confidence level of 93.0 % for energies from 30 to 3,000 keV. © 2012 Akadémiai Kiadó, Budapest, Hungary.

  • Zakari-Issoufou A-A, Bui VM, Fallot M, Porta A, Algora A, Agramunt J, Estevez E, Jordan MD, Molina F, Perez A, Rubio B, Tain JL, Valencia E, Bowry M, Farrelly GF, Gelletly W, Podolyak Z, Regan PH, Rice S, Aysto J, Eloma V, Hakala J, Jokinen A, Kankainen A, Moore I, Penttila H, Rissanen J, Weber C, Cano-Ott D, Garcia A, Martinez T, Mendoza E, Caballero-Folch R, Gomez-Hornillos MB, Gorlychev V, Kondev FG. (2013) 'The total absorption spectroscopy technique for reactor technology and basic nuclear physics'. IEEE Nuclear Science Symposium Conference Record,

    Abstract

    Understanding the β-decay properties of fission products is very important for nuclear reactor monitoring & safety. Indeed, the β-decay of fission products is a source of power during nuclear reactor operation and after, this activity is the main contributor to the decay-heat representing ∼7-8% of a reactor nominal power. β-decay is also at the origin of the antineutrinos coming from nuclear reactor. The study of antineutrinos is mandatory for nuclear safeguard policies based on antineutrino detection. But there are still some discrepancies in the calculation of the decay-heat and antineutrino spectra. One reason of the distortions observed seems to be linked to the Pandemonium effect. In order to improve the accuracy in the prediction of these quantities, new measurements of fission products β-decay properties, not sensitive to this effect, have been performed with a Total Absorption spectrometer (TAS). An overview of the TAS technique and first results from the latest experiment will be presented. © 2013 IEEE.

  • Zakari-Issoufou A-A, Porta A, Fallot M, Bui VM, Algora A, Tain JL, Valencia E, Agramunt J, Estévez E, Jordan MD, Molina F, Perez A, Rubio B, Rice S, Bowry M, Farrelly GF, Gelletly W, Podolyak Z, Regan PH, Äystö J, Eloma V, Hakala J, Jokinen A, Kankainen A, Moore I, Penttilä H, Rissanen J, Weber C, Cano-Ott D, Garcia A, Martinez T, Mendoza E, Caballero-Folch R, Gomez-Hornillos MB, Gorlychev V, Kondev FG. (2013) 'Measurement of fission products β decay properties using a total absorption spectrometer'. EPJ Web of Conferences, 62

    Abstract

    In a nuclear reactor, the decay of fission fragments is at the origin of decay heat and antineutrino flux. These quantities are not well known while they are very important for reactor safety and for our understanding of neutrino physics. One reason for the discrepancies observed in the estimation of the decay heat and antineutrinos flux coming from reactors could be linked with the Pandemonium effect. New measurements have been performed at the JYFL facility of Jyväskylä with a Total Absorption Spectrometer (TAS) in order to circumvent this effect. An overview of the TAS technique and first results from the 2009 measurement campaign will be presented. © Owned by the authors, published by EDP Sciences, 2013.

  • Britton R, Regan PH, Burnett JL, Davies AV. (2013) 'Improving the effectiveness of a low-energy Compton suppression system'. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 729, pp. 64-68.

    Abstract

    A novel method for collecting and processing coincidence data from a Compton Suppressed Low Energy Photon Spectrometer (LEPS) is presented, greatly simplifying the current setup and extending the suppression abilities of the system. Offline analysis is used, eliminating the need to discard coincidence data when vetoing coincident events with fast-timing electronics. Additional coincident events are identified that are usually missed, and which represent interactions in the active NaI(Tl) shield prior to an interaction in the LEPS detector. By suppressing these events, the Compton Suppression factor was improved by 144% for the 661.66 keV decay line in a Cs source. The geometry used for this particular Compton suppression system is highly sensitive to these effects, however similar event profiles are expected in all coincidence systems. © 2013 Elsevier B.V.

  • Régis J-M, Jolie J, Pascovici G, Saed-Samii N, Warr N, Degenkolb J, Fransen C, Rudigier M, Wilmsen D, Mach H, Fraile LM, Olaizola B, Simpson GS, Bruce A, Roberts OJ, Ghita DG, Mǎrginean N, Stroe L, Kisyov S, Lalkovski S, Koester U, Mutti P, Urban W, Korgul A, Podolyak Z, Regan PH. (2013) 'The generalized centroid difference method for picosecond sensitive determination of lifetimes of nuclear excited states using large fast-timing arrays'. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 726

    Abstract

    A novel method for direct electronic "fast-timing" lifetime measurements of nuclear excited states via γ-γ coincidences using an array equipped with Nâ̂̂N equally shaped very fast high-resolution LaBr(Ce) scintillator detectors is presented. Analogous to the mirror symmetric centroid difference method, the generalized centroid difference method provides two independent "start" and "stop" time spectra obtained by a superposition of the N(N-1) γ-γ time difference spectra of the N detector fast-timing system. The two fast-timing array time spectra correspond to a forward and reverse gating of a specific γ-γ cascade. Provided that the energy response and the electronic time pick-off of the detectors are almost equal, a mean prompt response difference between start and stop events is calibrated and used as a single correction for lifetime determination. These combined fast-timing arrays mean γ-γ time-walk characteristics can be determined for 40keV<<1.3MeV with an accuracy less than 5 ps using a Eu γ-ray source. Due to reduction and cancellation of many possible systematic errors, the lifetime determination limit of the method over the total dynamic range is mainly determined by the statistics. The setup of an N=4 detector fast-timing array delivered an absolute time resolving power of 3 ps for 10 000 γ-γ events per total fast timing array start and stop time spectrum. The new method is tested over the total dynamic range by the measurements of known picosecond lifetimes in standard γ-ray sources. © 2013 Elsevier B.V.

  • Habib AS, Regan PH, Bradley DA, Matthews MC, Shutt AL, Alsulaiti H. (2013) 'Characterization of naturally occurring radioactive materials in Libyan oil pipe scale using a germanium detector and Monte Carlo simulation'. Radiation Physics and Chemistry,

    Abstract

    Radioactive scale formation in various oil production facilities is acknowledged to pose a potential significant health and environmental issue. The presence of such an issue in Libyan oil fields was recognized as early as 1998. The naturally occurring radioactive materials (NORM) involved in this matter are radium isotopes (Ra and Ra) and their decay products, precipitating into scales formed on the surfaces of production equipment. A field trip to a number of onshore Libyan oil fields has indicated the existence of elevated levels of specific activity in a number of locations in some of the more mature oil fields. In this study, oil scale samples collected from different parts of Libya have been characterized using gamma spectroscopy through use of a well shielded HPGe spectrometer. To avoid potential alpha-bearing dust inhalation and in accord with safe working practices at this University, the samples, contained in plastic bags and existing in different geometries, are not permitted to be opened. MCNP, a Monte Carlo simulation code, is being used to simulate the spectrometer and the scale samples in order to obtain the system absolute efficiency and then to calculate sample specific activities. The samples are assumed to have uniform densities and homogeneously distributed activity. Present results are compared to two extreme situations that were assumed in a previous study: (i) with the entire activity concentrated at a point on the sample surface proximal to the detector, simulating the sample lowest activity, and; (ii) with the entire activity concentrated at a point on the sample surface distal to the detector, simulating the sample highest activity. © 2013 Elsevier Ltd.

  • Bell SJ, Judge SM, Regan PH. (2012) 'An investigation of HPGe gamma efficiency calibration software (ANGLE V.3) for applications in nuclear decommissioning.'. Appl Radiat Isot, England: 70 (12), pp. 2737-2741.

    Abstract

    High resolution gamma spectrometry offers a rapid method to characterise waste materials on a decommissioning nuclear site. To meet regulatory requirements, measurements must be traceable to national standards, meaning that the spectrometers must be calibrated for a wide range of materials. Semi-empirical modelling software (such as ANGLE™) offers a convenient method to carry out such calibrations. This paper describes an assessment of the modelling software for use by a small laboratory based on a nuclear site. The results confirmed the need for accurate information on the detection construction if the calibration were to be accurate to within 10%.

  • Soderstrom P-A, Recchia F, Nyberg J, Gadea A, Lenzi SM, Poves A, Atac A, Aydin S, Bazzacco D, Bednarczyk P, Bellato M, Birkenbach B, Bortolato D, Boston AJ, Boston HC, Bruyneel B, Bucurescu D, Calore E, Cederwall B, Charles L, Chavas J, Colosimo S, Crespi FCL, Cullen DM, de Angelis G, Desesquelles P, Dosme N, Duchene G, Eberth J, Farnea E, Filmer F, Gorgen A, Gottardo A, Grebosz J, Gulmini M, Hess H, Hughes TA, Jaworski G, Jolie J, Joshi P, Judson DS, Jungclaus A, Karkour N, Karolak M, Kempley RS, Khaplanov A, Korten W, Ljungvall J, Lunardi S, Maj A, Maron G, Meczynski W, Menegazzo R, Mengoni D, Michelagnoli C, Molini P, Napoli DR, Nolan PJ, Norman M, Obertelli A, Podolyak Z, Pullia A, Quintana B, Redon N, Regan PH, Reiter P, Robinson AP, Sahin E, Simpson J, Salsac MD, Smith JF, Stezowski O, Theisen C, Tonev D, Unsworth C, Ur CA, Valiente-Dobon JJ, Wiens A. (2012) 'High-spin structure in K-40'. PHYSICAL REVIEW C, 86 (5) Article number ARTN 054320
  • Kurcewicz J, Farinon F, Geissel H, Pietri S, Nociforo C, Prochazka A, Weick H, Winfield JS, Estradé A, Dillmann I, Evdokimov A, Gerl J, Gregor E, Kelić-Heil A, Knöbel R, Litvinov Y, Merchan E, Mukha I, Naqvi F, Pfützner M, Riese B, Ricciardi MV, Scheidenberger C, Spiller P, Stadlmann J, Terashima S, Winkler M, Sun B, Allegro PRP, Bail A, Bélier G, Taïeb J, Benlliure J, Benzoni G, Bunce M, Bowry M, Podolyák Z, Regan PH, Caballero-Folch R, Gottardo A, Valiente-Dobón JJ, Janik R, Sitar B, Strmen P, Szarka I, Kubo T, Pomorski M, Woods P. (2012) 'Discovery and cross-section measurement of neutron-rich isotopes in the element range from neodymium to platinum with the FRS'. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 717 (4-5), pp. 371-375.

    Abstract

    Using the high-resolution performance of the fragment separator FRS at GSI we have discovered 60 new neutron-rich isotopes in the atomic number range of 60≥Z≥78. The new isotopes were unambiguously identified in reactions with a U238 beam impinging on a Be target at 1 GeV/nucleon. The production cross-section for the new isotopes have been measured down to the pico-barn level and compared with predictions of different model calculations. For elements above hafnium fragmentation is the dominant reaction mechanism which creates the new isotopes, whereas fission plays a dominant role for the production of the new isotopes up to thulium. © 2012 Elsevier B.V.

  • Gottardo A, Valiente-Dobón JJ, De Angelis G, Napoli DR, Sahin E, Lunardi S, Lenzi SM, Maglione E, Benzoni G, Nicolini R, Bracco A, Camera F, Crespi FCL, Corsi A, Leoni S, Million B, Morales AI, Wieland O, Gadea A, Algora A, Bazzacco D, Farnea E, Menegazzo R, Mengoni D, Recchia F, Ur CA, Boutachkov P, Górska M, Pietri S, Weick H, Cortes ML, Domingo-Pardo C, Engert T, Farinon F, Geissel H, Gerl J, Goel N, Gregor E, Habermann T, Hoischen R, Kojouharov I, Kurz N, Naqvi F, Nociforo C, Prochazka A, Prokopowicz W, Schaffner H, Sharma A, Wollersheim H-J, Bruce AM, Bunce M, Denis Bacelar AM, Grebosz J, Podolyák Z, Regan PH, Al-Dahan N, Bowry M, Deo AY, Farrelly GF, Reed MW, Swan TPD, Walker PM, Pfützner M, Alcántara Núñez J, Ayyad Y, Benlliure J, Alkhomashi N, Allegro PRP, Ribas RV, Casarejos E, Doncel M, Dombradi Z, Eppinger K, Klupp S, Steiger K, Rudolph D, Janik R, Sitar B, Strmen P, Szarka I, Mandal S, Siwal D, Nowacki F, Zuker AP. (2012) 'New isomers in the full seniority scheme of neutron-rich lead isotopes: The role of effective three-body forces'. Physical Review Letters, 109 (16)

    Abstract

    The neutron-rich lead isotopes, up to Pb216, have been studied for the first time, exploiting the fragmentation of a primary uranium beam at the FRS-RISING setup at GSI. The observed isomeric states exhibit electromagnetic transition strengths which deviate from state-of-the-art shell-model calculations. It is shown that their complete description demands the introduction of effective three-body interactions and two-body transition operators in the conventional neutron valence space beyond Pb208. © 2012 American Physical Society.

  • Nara Singh BS, Brock TS, Wadsworth R, Grawe H, Boutachkov P, Górska M, Pietri S, Domingo-Pardo C, Cáceres L, Engert T, Farinon F, Gerl J, Goel N, Hoischen R, Kojouharov I, Kurz N, Merchán E, Nociforo C, Prochazka A, Schaffner H, Weick H, Wollersheim H-J, Braun N, Blazhev A, Bettermann L, Finke F, Geibel K, Ilie G, Iwasaki H, Jolie J, Reiter P, Scholl C, Warr N, Liu Z, Gottardo A, Woods PJ, Rudolph D, Steer SJ, Podolyák Z, Regan PH, Ataç A, Kaşkaş A, Faestermann T, Gernhäuser R, Hinke C, Krücken R, Grȩbosz J, Nyberg J, Söderström P-A, Pfützner M, Rinta-Antila S, Nowacki F. (2012) 'Influence of the np interaction on the β decay of 94Pd'. Physical Review C - Nuclear Physics, 86 (4)

    Abstract

    We present results from stopped beam rare isotope spectroscopic investigations at the GSI (RISING) experiment based on the detection of γ-ray transitions following the β decay of 94Pd. A comparison between the measured low-lying level scheme of 94Rh and the prediction from shell-model calculations reveals the important roles of the g and g orbitals in explaining the structural features. The low values of the Gamow-Teller strengths B(GT) can be attributed to the influence of the neutron-proton interaction, which gives rise to an increased seniority mixing for the nuclear states, thereby leading to a fragmentation of the strength to several daughter levels. These results provide further strong indications that 94Pd resides in the middle of a structural transition region in the Pd isotopes as the N=Z line is approached. © 2012 American Physical Society.

  • Benzoni G, Morales AI, Bracco A, Camera F, Crespi FCL, Corsi AM, Leoni S, Million B, Nicolini R, Wieland O, Valiente-Dobón JJ, Gottardo A, de Angelis G, Napoli DR, Sahin E, Lunardi S, Gadea A, Algora A, Bazzacco D, Farnea E, Menegazzo R, Mengoni D, Recchia F, Ur CA, Boutachkov P, Górska M, Pietri S, Weick H, Cortes ML, Domingo-Pardo C, Engert T, Farinon F, Geissel H, Gerl J, Goel N, Gregor E, Habermann T, Hoischen R, Kojouharov I, Kurz N, Naqvi F, Nociforo C, Prochazka A, Prokopowicz W, Schaffner H, Sharma A, Wollersheim H-J, Bruce AM, Denis Bacelar AM, Grebosz J, Podolyak Z, Regan PH, Al-Dahan N, Bowry M, Bunce M, Deo AY, Farrelly GF, Reed MW, Swan TPD, Walker PM, Pfützner M, Alcántara Núñez J, Ayyad Y, Benlliure J, Alkhomashi N, Allegro PRP, Ribas RV, Casarejos E, Doncel M, Dombradi Z, Eppinger K, Klupp S, Steiger K, Rudolph D, Janik R, Sitar B, Strmen P, Szarka I, Mandal S, Siwal D. (2012) 'First measurement of beta decay half-lives in neutron-rich Tl and Bi isotopes'. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 715 (4-5), pp. 293-297.

    Abstract

    Neutron-rich isotopes around lead, beyond N= 126, have been studied exploiting the fragmentation of an uranium primary beam at the FRS-RISING setup at GSI. For the first time β-decay half-lives of Bi and Tl isotopes have been derived. The half-lives have been extracted using a numerical simulation developed for experiments in high-background conditions. Comparison with state of the art models used in r-process calculations is given, showing a systematic underestimation of the experimental values, at variance from close-lying nuclei. © 2012 Elsevier B.V.

  • Nasir T, Al-Sulaiti H, Regan PH. (2012) 'Assessment of radioactivity in some soil samples of qatar by gamma-ray spectroscopy and the derived dose rates'. Pakistan Journal of Scientific and Industrial Research Series A: Physical Sciences, 55 (3), pp. 128-134.

    Abstract

    The activity concentrations of some natural and artificial radionuclides have been measured in soil samples by gamma-ray spectroscopy using a high purity germanium detector. From the obtained gamma-ray spectra, the activity concentrations of U and Th natural decay series and the long-lived naturally occurring radionuclide K have been determined, in addition to the fission product Cs. A wide range of different gamma-ray lines ranging from -100 keV up to 2.6 MeV, associated with the decay products ofU andTh series have been analyzed independently to obtain more statistically significant overall results. The data have been analyzed, when secular equilibrium of the radionuclides is achieved within the samples. The weighted activity concentrations of U andTh series vary from 4.4 to 64.4 and 0.8 to 7.6 Bq/kg, respectively. The activity concentrations of K and Cs have been found in the range of13.6 to 179.5 and 0.3 to 3.7 Bq/kg, respectively. Based on the measured activity concentrations, dose rate, radium equivalent, radiation hazard index and annual effective dose rates have been estimated. The values obtained are within the recommended safety limits.

  • Malain D, Regan PH, Bradley DA, Matthews M, Al-Sulaiti HA, Santawamaitre T. (2012) 'An evaluation of the natural radioactivity in Andaman beach sand samples of Thailand after the 2004 tsunami.'. Appl Radiat Isot, England: 70 (8), pp. 1467-1474.

    Abstract

    Following the 2004 'Boxing day' tsunami, a determination has been made of the activity concentrations of (226)Ra, (232)Th and (40)K in beach sand samples which have been collected from various locations along the Andaman coast of the Thai peninsula. Use has been made of a HPGe detector-based, low-background gamma-ray counting system. The natural radioactivity levels of (226)Ra, (232)Th and (40)K measured from these samples was found to lie in the range 1.6-52.5, 0.3-73.9 and 2.8-1111.9Bq/kg respectively for the west coast and 3.5-83.1, 4.5-42.0, and 9.6-1376 Bq/kg respectively for the east coast. The radioactivity concentrations of (226)Ra, (232)Th and (40)K along the Andaman coast are comparable to that of the east coast, which was not exposed to the tsunami. The corresponding annual effective dose varies from 1.6-105.9 μSv/y with a mean value of 59.1 ± 0.3 μSv/y, significantly lower than the worldwide average as reported by United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) (2000).

  • Anagnostatou V, Regan PH, Bunce MR, McCarthy D, Werner V, Bettermann L, Casperson R, Chevrier R, Cooper N, Heinz A, Radeck D, Smith MK, Williams E, Boniwell C, Paurstein P, Xu FR, Dong GX. (2012) 'Electromagnetic transition rates in Pd using the Recoil Doppler Shift Technique'. Applied Radiation and Isotopes, 70 (7), pp. 1321-1324.

    Abstract

    The quadrupole deformations for the low-lying states in the transitional nuclei Pd have been deduced through the measurement of their electric quadrupole transition probabilities using the Recoil Distance Doppler Shift Method. The nuclei were studied using a 268MeV Se beam impinging on a thin, self-supporting Mg target. States in Pd and Pd populated by the four and three neutron evaporation channels respectively, with reaction gamma-rays detected using the SPEEDY gamma-ray detection array. The recoiling nuclei were stopped in a copper foil and gamma-ray coincidence data taken at 10 separate target-stopper distances between 35μm and 750μm. The mean-lifetimes for the lowest lying 2 (in Pd) and 15/2 (in Pd) states were measured to be 13.3(9)ps and 10.8(8)ps respectively. These data are compared with predictions from nuclear Total Routhian Surface calculations, which are found to agree with the experimentally deduced values to within 10%. © 2011 Elsevier Ltd.

  • Regan PH. (2012) 'From RISING to the DESPEC fast-timing project within NUSTAR at FAIR: Sub-nanosecond nuclear timing spectroscopy with LaBr scintillators'. Applied Radiation and Isotopes, 70 (7), pp. 1125-1130.

    Abstract

    This paper summarises a presentation given at the IRRMA8 conference in June 2011 which reviewed briefly the topic of current research studies in the evolution of nuclear structure with changing proton and neutron numbers. A short review of relevant contemporary spectroscopic studies of the structure of nuclei with highly exotic N/Z ratios using projectile fragmentation and fission reactions is given, together with an overview of some of the physics research aims to be attacked using the proposed Decay Spectroscopy (DESPEC) LaBr Fast-Timing gamma-ray array for the NUSTAR project at the upcoming Facility for Anti-Proton and Ion Research (FAIR). Examples of recent results using both 'isomer' and Β -delayed gamma-ray decay measurements with the Stopped RISING hyper-pure germanium array at GSI are summarised and used to highlight some of the fundamental physics studies which are expected to become available in this area of research in the coming decade. Examples of the performance of cerium-doped LaBr detectors from 'in-beam' test experiments are presented together with initial plans for the geometry of the planned multi-detector LaBr (Ce) array for DESPEC. © 2012 Elsevier Ltd.

  • Al-Sulaiti L, Shipley D, Thomas R, Owen P, Kacperek A, Regan PH, Palmans H. (2012) 'Water equivalence of some plastic-water phantom materials for clinical proton beam dosimetry.'. Appl Radiat Isot, England: 70 (7), pp. 1052-1057.

    Abstract

    Plastic-water phantom materials are not exactly water equivalent since they have a different elemental composition and different interaction cross sections for protons than water. Several studies of the water equivalence of plastic-water phantom materials have been reported for photon and electron beams, but none for clinical proton beams. In proton beams, the difference between non-elastic nuclear interactions in plastic-water phantom materials compared to those in water should be considered. In this work, the water equivalence of Plastic Water® (PW)1, Plastic Water® Diagnostic Therapy (PWDT)1 and solid water (WT1)2 phantoms was studied for clinical proton energies of 60 MeV and 200 MeV. This was done by evaluating the fluence correction factor at equivalent depths; first with respect to water and then with respect to graphite by experiment and Monte Carlo (MC) simulations using FLUKA. MC simulations showed that the fluence correction with respect to water was less than 0.5% up to the entire penetration depth of the protons at 60 MeV and less than 1% at 200 MeV up to 20 cm depth for PWDT, PW and WT1. With respect to graphite the fluence correction was about 0.5% for 60 MeV and about 4% for 200 MeV. The experimental results for modulated and un-modulated 60 MeV proton beams showed good agreement with the MC simulated fluence correction factors with respect to graphite deviating less than 1% from unity for the three plastic-water phantoms.

  • Al-Sulaiti L, Owen P, Regan PH, Shipley D, Thomas R, Palmans H, Kacperek A. (2012) 'Water equivalence of some plastic-water phantom materials for clinical proton beam dosimetry'. Applied Radiation and Isotopes, 70 (7), pp. 1052-1057.

    Abstract

    Plastic-water phantom materials are not exactly water equivalent since they have a different elemental composition and different interaction cross sections for protons than water. Several studies of the water equivalence of plastic-water phantom materials have been reported for photon and electron beams, but none for clinical proton beams. In proton beams, the difference between non-elastic nuclear interactions in plastic-water phantom materials compared to those in water should be considered. In this work, the water equivalence of Plastic Water (PW) , Plastic Water Diagnostic Therapy (PWDT) and solid water (WT1) phantoms was studied for clinical proton energies of 60MeV and 200MeV. This was done by evaluating the fluence correction factor at equivalent depths; first with respect to water and then with respect to graphite by experiment and Monte Carlo (MC) simulations using FLUKA. MC simulations showed that the fluence correction with respect to water was less than 0.5% up to the entire penetration depth of the protons at 60MeV and less than 1% at 200MeV up to 20cm depth for PWDT, PW and WT1. With respect to graphite the fluence correction was about 0.5% for 60MeV and about 4% for 200MeV. The experimental results for modulated and un-modulated 60MeV proton beams showed good agreement with the MC simulated fluence correction factors with respect to graphite deviating less than 1% from unity for the three plastic-water phantoms. © 2012 Elsevier Ltd.

  • Regan PH. (2012) 'From RISING to the DESPEC fast-timing project within NUSTAR at FAIR: sub-nanosecond nuclear timing spectroscopy with LaBr3 scintillators.'. Appl Radiat Isot, England: 70 (7), pp. 1125-1130.

    Abstract

    This paper summarises a presentation given at the IRRMA8 conference in June 2011 which reviewed briefly the topic of current research studies in the evolution of nuclear structure with changing proton and neutron numbers. A short review of relevant contemporary spectroscopic studies of the structure of nuclei with highly exotic N/Z ratios using projectile fragmentation and fission reactions is given, together with an overview of some of the physics research aims to be attacked using the proposed Decay Spectroscopy (DESPEC) LaBr3 Fast-Timing gamma-ray array for the NUSTAR project at the upcoming Facility for Anti-Proton and Ion Research (FAIR). Examples of recent results using both 'isomer' and β--delayed gamma-ray decay measurements with the Stopped RISING hyper-pure germanium array at GSI are summarised and used to highlight some of the fundamental physics studies which are expected to become available in this area of research in the coming decade. Examples of the performance of cerium-doped LaBr3 detectors from 'in-beam' test experiments are presented together with initial plans for the geometry of the planned multi-detector LaBr3(Ce) array for DESPEC.

  • Al-Sulaiti H, Nasir T, Al Mugren KS, Al-Dahan N, Bradley DA, Regan PH, Malain D, Habib A, Al-Dosari M, Santawamaitre T, Alkhomashi N, Bukhari S, Matthews M. (2012) 'Determination of the natural radioactivity levels in north west of Dukhan, Qatar using high-resolution gamma-ray spectrometry'. Applied Radiation and Isotopes, 70 (7), pp. 1344-1350.

    Abstract

    This study is aimed at the determination of the activity concentrations of naturally occuring and technologically enhanced levels of radiation in 34 representative soil samples that have been collected from an inshore oil field area which was found to have, in a previous study, the highest observed value of Ra concentration among 129 soil samples. The activity concentrations of U and Ra have been inferred from gamma-ray transitions associated with their decay progenies and measured using a hyper-pure germanium detector. Details of the sample preparation and the gamma-ray spectroscopic analysis techniques are presented, together with the values of the activity concentrations associated with the naturally occuring radionuclide chains for all the samples collected from NW Dukhan. Discrete-line, gamma-ray energy transitions from spectral lines ranging in energy from ~100keV up to 2.6MeV have been associated with characteristic decays of the various decay products within the U and Th radioactive decay chains. These data have been analyzed, under the assumption of secular equilibrium for the U and Th decay chains. Details of the sample preparation and the gamma-ray spectroscopic analysis techniques are presented. The weighted mean value of the activity concentrations of Ra in one of the samples was found to be around a factor of 2 higher than the values obtained in the previous study and approximately a factor of 10 higher than the accepted worldwide average value of 35Bq/kg. The weighted mean values of the activity concentrations of Th and K were also deduced and found to be within the worldwide average values of 30 and 400Bq/kg, respectively. Our previous study reported a value of 201.9±1.5 ±13 Bq/kg for Ra in one sample and further investigation in the current work determined a measured value for Ra of 342.00±1.9 ±25 Bq/kg in a sample taken from the same locality. This is significantly higher than all the other investigated soil samples in the current and previous works. Notably, the Th levels in the same sample are within the worldwide average expectations, implying that the increased Ra concentration arises from TENORM processes. © 2011 Elsevier Ltd.

  • Alharbi T, Mason PJR, Regan PH, Podolyák Z, Nakhostin M, Bowry M, Mârginean N, Bucurescu D, Câta-Danil G, Câta-Danil I, Deleanu D, Filipescu D, Glodariu T, Ghiţâ D, Mârginean R, Mihai C, Negret A, Pascu S, Sava T, Stroe L, Suliman G, Zamfir NV, Bruce AM, Rodriguez Triguero C, Bender PC, Garg U, Erduran MN, Kusoglu A, Bostan M, Detistov P, Alkhomashi N, Sinha AK, Chakrabarti R, Ghugre SS. (2012) 'Gamma-ray fast-timing coincidence measurements from the O+ O fusion-evaporation reaction using a mixed LaBr -HPGe array'. Applied Radiation and Isotopes, 70 (7), pp. 1337-1339.

    Abstract

    We report on a gamma-ray coincidence analysis using a mixed array of hyperpure germanium and cerium-doped lanthanum tri-bromide (LaBr :Ce) scintillation detectors to study nuclear electromagnetic transition rates in the pico-to-nanosecond time regime in P and S following fusion-evaporation reactions between an O beam and an isotopically enriched O implanted tantalum target. Energies from decay gamma-rays associated with the reaction residues were measured in event-by-event coincidence mode, with the measured time difference information between the pairs of gamma-rays in each event also recorded using the ultra-fast coincidence timing technique. The experiment used the good full-energy peak resolution of the LaBr :Ce detectors coupled with their excellent timing responses in order to determine the excited state lifetime associated with the lowest lying, cross-shell, I =4 "intruder" state previously reported in the N=19 isotone P. The extracted lifetime is consistent with a mainly single-particle M2 multipolarity associated with a f →d single particle transition. © 2011 Elsevier Ltd.

  • Al-Sulaiti H, Nasir T, Al Mugren KS, Alkhomashi N, Al-Dahan N, Al-Dosari M, Bradley DA, Bukhari S, Matthews M, Regan PH, Santawamaitre T, Malain D, Habib A. (2012) 'Determination of the natural radioactivity levels in north west of Dukhan, Qatar using high-resolution gamma-ray spectrometry.'. Appl Radiat Isot, England: 70 (7), pp. 1344-1350.

    Abstract

    This study is aimed at the determination of the activity concentrations of naturally occuring and technologically enhanced levels of radiation in 34 representative soil samples that have been collected from an inshore oil field area which was found to have, in a previous study, the highest observed value of 226Ra concentration among 129 soil samples. The activity concentrations of 238U and 226Ra have been inferred from gamma-ray transitions associated with their decay progenies and measured using a hyper-pure germanium detector. Details of the sample preparation and the gamma-ray spectroscopic analysis techniques are presented, together with the values of the activity concentrations associated with the naturally occuring radionuclide chains for all the samples collected from NW Dukhan. Discrete-line, gamma-ray energy transitions from spectral lines ranging in energy from ∼100 keV up to 2.6 MeV have been associated with characteristic decays of the various decay products within the 235.8U and 232Th radioactive decay chains. These data have been analyzed, under the assumption of secular equilibrium for the U and Th decay chains. Details of the sample preparation and the gamma-ray spectroscopic analysis techniques are presented. The weighted mean value of the activity concentrations of 226Ra in one of the samples was found to be around a factor of 2 higher than the values obtained in the previous study and approximately a factor of 10 higher than the accepted worldwide average value of 35 Bq/kg. The weighted mean values of the activity concentrations of 232Th and 40K were also deduced and found to be within the worldwide average values of 30 and 400 Bq/kg, respectively. Our previous study reported a value of 201.9±1.5Stat.±13Syst.Bq/kg for 226Ra in one sample and further investigation in the current work determined a measured value for 226Ra of 342.00±1.9Stat.±25Syst.Bq/kg in a sample taken from the same locality. This is significantly higher than all the other investigated soil samples in the current and previous works. Notably, the Th levels in the same sample are within the worldwide average expectations, implying that the increased 226Ra concentration arises from TENORM processes.

  • Hinke CB, Boehmer M, Boutachkov P, Faestermann T, Geissel H, Gerl J, Gernhaeuser R, Gorska M, Gottardo A, Grawe H, Grebosz JL, Kruecken R, Kurz N, Liu Z, Maier L, Nowacki F, Pietri S, Podolyak Z, Sieja K, Steiger K, Straub K, Weick H, Wollersheim H-J, Woods PJ, Al-Dahan N, Alkhomashi N, Atac A, Blazhev A, Braun NF, Celikovic IT, Davinson T, Dillmann I, Domingo-Pardo C, Doornenbal PC, de France G, Farrelly GF, Farinon F, Goel N, Habermann TC, Hoischen R, Janik R, Karny M, Kaskas A, Kojouharov IM, Kroell T, Litvinov Y, Myalski S, Nebel F, Nishimura S, Nociforo C, Nyberg J, Parikh AR, Prochazka A, Regan PH, Rigollet C, Schaffner H, Scheidenberger C, Schwertel S, Soederstroem P-A, Steer SJ, Stolz A, Strmen P. (2012) 'Superallowed Gamow-Teller decay of the doubly magic nucleus Sn-100'. NATURE, 486 (7403), pp. 341-345.
  • Mason PJR, Alharbi T, Regan PH, Marginean N, Podolyak Z, Simpson EC, Alkhomashi N, Bender PC, Bowry M, Bostan M, Bucurescu D, Bruce AM, Cata-Danil G, Cata-Danil I, Chakrabarti R, Deleanu D, Detistov P, Erduran MN, Filipescu D, Garg U, Glodariu T, Ghita D, Ghugre SS, Kusoglu A, Marginean R, Mihai C, Nakhostin M, Negret A, Pascu S, Triguero CR, Sava T, Sinha AK, Stroe L, Suliman G, Zamfir NV. (2012) 'Half-life of the I-pi=4(-) intruder state in P-34: M2 transition strengths approaching the island of inversion'. PHYSICAL REVIEW C, 85 (6) Article number ARTN 064303
  • Al-Dahan N, Regan PH, Podolyák Z, Walker PM, Farrelly G, Pietri SB, Stevenson PD, Gelletly W, Steer SJ, Garnsworthy AB, Cullen IJ, Deo AY, Mason PJ, Alkhomashi N, Dracoulis GD, Benlliure J, Casarejos E, Estevez ME, Gerl J, Wollersheim HJ, Górska M, Kojouharov I, Schaffner H, Boutachkov P, Tashenov S, Casten RF, Grebosz J, Algora A, Molina F, Rubio B, Benzoni G, Blazhev A, Mücher D, Bruce AM, Denis Bacelar AM, Lalkovski S, Fujita Y, Hoischen R, Kumar R, Liu Z, Woods PJ, Mihai C, Tamii A, Valiente-Dobón JJ. (2012) 'Multiple β Decaying states in 194Re: Shape evolution in neutron-rich osmium isotopes'. Physical Review C - Nuclear Physics, 85 (3)

    Abstract

    β decays from heavy, neutron-rich nuclei with A∼190 have been investigated following their production via the relativistic projectile fragmentation of an E/A=1 GeV 208Pb primary beam on a ∼2.5 g/cm2 9Be target. The reaction products were separated and identified using the GSI FRagment Separator (FRS) and stopped in the RISING active stopper. γ decays were observed and correlated with these secondary ions on an event-by-event basis such that γ-ray transitions following from both internal (isomeric) and β decays were recorded. A number of discrete, β-delayed γ-ray transitions associated with β decays from 194Re to excited states in 194Os have been observed, including previously reported decays from the yrast Iπ=(6 ) state. Three previously unreported γ-ray transitions with energies 194, 349, and 554 keV are also identified; these transitions are associated with decays from higher spin states in 194Os. The results of these investigations are compared with theoretical predictions from Nilsson multi-quasiparticle (MQP) calculations. Based on lifetime measurements and the observed feeding pattern to states in 194Os, it is concluded that there are three β -decaying states in 194Re. © 2012 American Physical Society.

  • Al-Dahan N, Regan PH, Podolyák Z, Walker PM, Alkhomashi N, Dracoulis GD, Farrelly G, Benlliure J, Pietri SB, Casten RF, Stevenson PD, Gelletly W, Steer SJ, Garnsworthy AB, Casarejos E, Gerl J, Wollersheim HJ, Grebosz J, Górska M, Kojouharov I, Schaffner H, Algora A, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Cullen IJ, Denis Bacelar AM, Deo AY, Estevez ME, Fujita Y, Hoischen R, Kumar R, Lalkovski S, Liu Z, Mason PJ, Mihai C, Molina F, Mücher D, Rubio B, Tamii A, Tashenov S, Valiente-Dobón JJ, Woods PJ. (2012) 'Multiple β - Decaying states in 194Re: Shape evolution in neutron-rich osmium isotopes'. Physical Review C - Nuclear Physics, 85 (3) Article number 034301

    Abstract

    decays from heavy, neutron-rich nuclei with A∼190 have been investigated following their production via the relativistic projectile fragmentation of an E/A=1 GeV 208Pb primary beam on a ∼2.5 g/cm2 9Be target. The reaction products were separated and identified using the GSI FRagment Separator (FRS) and stopped in the RISING active stopper. γ decays were observed and correlated with these secondary ions on an event-by-event basis such that γ-ray transitions following from both internal (isomeric) and β decays were recorded. A number of discrete, β-delayed γ-ray transitions associated with β decays from 194Re to excited states in 194Os have been observed, including previously reported decays from the yrast Iπ=(6+) state. Three previously unreported γ-ray transitions with energies 194, 349, and 554 keV are also identified; these transitions are associated with decays from higher spin states in 194Os. The results of these investigations are compared with theoretical predictions from Nilsson multi-quasiparticle (MQP) calculations. Based on lifetime measurements and the observed feeding pattern to states in 194Os, it is concluded that there are three β−-decaying states in 194Re.

  • Lalkovski S, Kisyov S, Zhekova M, Bruce AM, Bacelar AMD, Górska M, Pietri S, Bednarczyk P, Caceres L, Doornenbal P, Geissel H, Gerl J, Grȩbosz J, Kojouharov I, Kurz N, Prokopowicz W, Schaffner H, Tashenov S, Wollersheim HJ, Podolyák Z, Cullen IJ, Farrelly GF, Garnsworthy AB, Gelletly W, Regan PH, Steer S, Walker PM, Casarejos E, Myalski S, Hinke C, Ilie G, Jaworski G, Palacz M. (2012) 'Single-particle isomeric states in Pd and Ru'. Journal of Physics: Conference Series, 366 (1)

    Abstract

    Neutron-rich nuclei were populated in a relativistic fission of U. Gamma-rays with energies of 135 keV and 184 keV were associated with two isomeric states in Pd and Ru. Half-lives of 0.63(5) μs and 2.0(3) μs were deduced and the isomeric states were interpreted in terms of prolate deformed single-particle states.

  • Bruce AM, Bacelar AMD, Benzoni G, Gottardo A, Nicolini R, Sahin E, Gadea A, Algora A, Górska M, Pietri S, Boutachkov P, Cortés ML, Domingo-Prado C, Farinon F, Geissel H, Gerl J, Goel N, Gregor E, Haberman T, Hoischen R, Kojouharov I, Kurz N, Nociforo C, Prochazka A, Prokopowicz W, Schaffner H, Sharma A, Weick H, Wollersheim H-J, Valiente-Dobón JJ, Mengoni D, Podolyák Z, Al-Dahan N, Alkhomashi N, Bowry M, Bunce M, Deo AY, Farrelly GF, Regan PH, Walker PM, Alcántara-Núñez JA, Ayyad Y, Allegro PRP, Casarejos E, Doncel M, Eppinger K, Klupp S, Steiger K, Grȩbosz J, Rudolph D, Janik R, Sitar B, Strmen P, Szarka I, Lunardi S, Menegazzo R, Mandal S, Siwal D, Naqvi F, Pissulla T. (2012) 'β decay of Y produced in projectile fission of U'. Journal of Physics: Conference Series, 381 (1)

    Abstract

    The population of Zr following the β decay of Y produced in the projectile fission of U at the GSI facility in Darmstadt, Germany has been studied. Y is known to decay into Zr via two states, one of high spin and the other low spin. These states preferentially populate different levels in the Zr daughter. In this paper the intensities of transitions in Zr observed are compared with those from the decay of the low-spin level studied at the TRISTAN facility at Brookhaven National Laboratory and of the high-spin level studied at the JOSEF separator at the Kernforschungsanlage Jülich. © Published under licence by IOP Publishing Ltd.

  • Alharbi T, Mason PJ, Regan PH, Podolyák Z, Mărginean N, Nakhostin M, Bowry M, Bucurescu D, Căta-Danil G, Căta-Danil I, Deleanu D, Filipescu D, Glodariu T, Ghiţă D, Mărginean R, Mihai C, Negret A, Pascu S, Sava T, Stroe L, Suliman G, Zamfir NV, Bruce AM, Rodriguez Triguero C, Bender PC, Garg U, Erduran MN, Kusoglu A, Bostan M, Detistov P, Alkhomashi N, Sinha AK, Chakrabarti R, Ghugre SS. (2012) 'Gamma-ray fast-timing coincidence measurements from the (18)O+(18)O fusion-evaporation reaction using a mixed LaBr(3)-HPGe array'. Appl Radiat Isot, 70 (7), pp. 1337-1339.

    Abstract

    We report on a gamma-ray coincidence analysis using a mixed array of hyperpure germanium and cerium-doped lanthanum tri-bromide (LaBr(3):Ce) scintillation detectors to study nuclear electromagnetic transition rates in the pico-to-nanosecond time regime in (33,34)P and (33)S following fusion-evaporation reactions between an (18)O beam and an isotopically enriched (18)O implanted tantalum target. Energies from decay gamma-rays associated with the reaction residues were measured in event-by-event coincidence mode, with the measured time difference information between the pairs of gamma-rays in each event also recorded using the ultra-fast coincidence timing technique. The experiment used the good full-energy peak resolution of the LaBr(3):Ce detectors coupled with their excellent timing responses in order to determine the excited state lifetime associated with the lowest lying, cross-shell, I(π)=4(-) "intruder" state previously reported in the N=19 isotone (34)P. The extracted lifetime is consistent with a mainly single-particle M2 multipolarity associated with a f(7/2)→d(5/2) single particle transition.

  • Bunce M, Regan PH, Anagnostatou V, Bowry M, Goddard P, Mason PJR, Reed MW, Ross TJ, Werner V, Cooper N, Ilie G, Beausang CW, Chen D, Hughes RO, Pauerstein B, Casperson RJ. (2012) 'A shell model study of the high spin states of Y'. Journal of Physics: Conference Series, 381 (1)

    Abstract

    Experiments were carried out at the Wright Nuclear Structure Laboratory at Yale University using the 21MV ESTU Tandem Van de Graaff accelerator with the purpose of studying Y. A beam of O impinged at laboratory energies of 60, 65 and 70 MeV on a 600 μg/cm Ge target with a thick (10mg/cm ) Au backing. This experiment was performed with the specific aim of accessing medium spin states of the nucleus of interest. A second experiment was undertaken to populate the nucleus of interest in higher spin states by impinging the same O beam on a thin 62 μg/cm Ge target with a 20 μg/cm carbon backing at a laboratory beam energy of 90 MeV. Gamma rays emitted following the decay of excited states in Y and other nuclei populated in the reactions were measured using the YRAST ball detector array, consisting of 10 Compton suppressed HPGe clover detectors. In conjunction with the experimental study presented here, nuclear shell model calculations using a truncated valence space have also been performed in an attempt to describe the single-particle make-up of the states observed. Preliminary results from these experiments and theoretical calculations are presented. © Published under licence by IOP Publishing Ltd.

  • Rice S, Regan PH, Podolyák Z, Gelletly W, Nichols AL, Valencia E, Algora A, Taín JL, Agramunt J. (2012) 'Decay heat measurements using total absorption gamma-ray spectroscopy'. Journal of Physics: Conference Series, 381 (1)

    Abstract

    A knowledge of the decay heat emitted by thermal neutron-irradiated nuclear fuel is an important factor in ensuring safe reactor design and operation, spent fuel removal from the core, and subsequent storage prior to and after reprocessing, and waste disposal. Decay heat can be readily calculated from the nuclear decay properties of the fission products, actinides and their decay products as generated within the irradiated fuel. Much of the information comes from experiments performed with HPGe detectors, which often underestimate the beta feeding to states at high excitation energies. This inability to detect high-energy gamma emissions effectively results in the derivation of decay schemes that suffer from the pandemonium effect, although such a serious problem can be avoided through application of total absorption γ-ray spectroscopy (TAS). The beta decay of key radionuclei produced as a consequence of the neutron-induced fission of U and Pu are being re-assessed by means of this spectroscopic technique. A brief synopsis is given of the Valencia-Surrey (BaF ) TAS detector, and their method of operation, calibration and spectral analysis. © Published under licence by IOP Publishing Ltd.

  • Britton R, Burnett J, Davies A, Regan PH. (2012) 'Preliminary simulations of NaI(Tl) detectors, and coincidence analysis using event stamping'. Journal of Radioanalytical and Nuclear Chemistry, , pp. 1-5.

    Abstract

    This paper discusses preliminary work into the modelling and processing of coincidence measurements, for which a Monte-Carlo simulation and a post-processing program have both been developed. In the current work, a GEANT4 code is used to simulate a pair of NaI(Tl) scintillators, which are used experimentally to both develop the post-processing program and validate the GEANT4 model. This is found to be accurate to within 9% at a confidence level of 93.0% for energies from 30 to 3,000 keV.

  • Akkoyun S, Algora A, Alikhani B, Ameil F, De Angelis G, Arnold L, Astier A, Ataç A, Aubert Y, Aufranc C, Austin A, Aydin S, Azaiez F, Badoer S, Balabanski DL, Barrientos D, Baulieu G, Baumann R, Bazzacco D, Beck FA, Beck T, Bednarczyk P, Bellato M, Bentley MA, Benzoni G, Berthier R, Berti L, Beunard R, Lo Bianco G, Birkenbach B, Bizzeti PG, Bizzeti-Sona AM, Le Blanc F, Blasco JM, Blasi N, Bloor D, Boiano C, Borsato M, Bortolato D, Boston AJ, Boston HC, Bourgault P, Boutachkov P, Bouty A, Bracco A, Brambilla S, Brawn IP, Brondi A, Broussard S, Bruyneel B, Bucurescu D, Burrows I, Bürger A, Cabaret S, Cahan B, Calore E, Camera F, Capsoni A, Carrió F, Casati G, Castoldi M, Cederwall B, Cercus J-L, Chambert V, El Chambit M, Chapman R, Charles L, Chavas J, Clément E, Cocconi P, Coelli S, Coleman-Smith PJ, Colombo A, Colosimo S, Commeaux C, Conventi D, Cooper RJ, Corsi A, Cortesi A, Costa L, Crespi FCL, Cresswell JR, Cullen DM, Curien D, Czermak A, Delbourg D, Depalo R, Descombes T, Désesquelles P, Detistov P, Diarra C, Didierjean F, Dimmock MR, Doan QT, Domingo-Pardo C, Doncel M, Dorangeville F, Dosme N, Drouen Y, Duchêne G, Dulny B, Eberth J, Edelbruck P, Egea J, Engert T, Erduran MN, Ertürk S, Fanin C, Fantinel S, Farnea E, Faul T, Filliger M, Filmer F, Finck C, De France G, Gadea A, Gast W, Geraci A, Gerl J, Gernhäuser R, Giannatiempo A, Giaz A, Gibelin L, Givechev A, Goel N, González V, Gottardo A, Grave X, Grȩbosz J, Griffiths R, Grint AN, Gros P, Guevara L, Gulmini M, Görgen A, Ha HTM, Habermann T, Harkness LJ, Harroch H, Hauschild K, He C, Hernández-Prieto A, Hervieu B, Hess H, Hüyük T, Ince E, Isocrate R, Jaworski G, Johnson A, Jolie J, Jones P, Jonson B, Joshi P, Judson DS, Jungclaus A, Kaci M, Karkour N, Karolak M, Kaşkaş A, Kebbiri M, Kempley RS, Khaplanov A, Klupp S, Kogimtzis M, Kojouharov I, Korichi A, Korten W, Kröll T, Krücken R, Kurz N, Ky BY, Labiche M, Lafay X, Lavergne L, Lazarus IH, Leboutelier S, Lefebvre F, Legay E, Legeard L, Lelli F, Lenzi SM, Leoni S, Lermitage A, Lersch D, Leske J, Letts SC, Lhenoret S, Lieder RM, Linget D, Ljungvall J, Lopez-Martens A, Lotodé A, Lunardi S, Maj A, Van Der Marel J, Mariette Y, Marginean N, Marginean R, Maron G, Mather AR, Mȩczyński W, Mendéz V, Medina P, Melon B, Menegazzo R, Mengoni D, Merchan E, Mihailescu L, Michelagnoli C, Mierzejewski J, Milechina L, Million B, Mitev K, Molini P, Montanari D, Moon S, Morbiducci F, Moro R, Morrall PS, Möller O, Nannini A, Napoli DR, Nelson L, Nespolo M, Ngo VL, Nicoletto M, Nicolini R, Le Noa Y, Nolan PJ, Norman M, Nyberg J, Obertelli A, Olariu A, Orlandi R, Oxley DC, Özben C, Ozille M, Oziol C, Pachoud E, Palacz M, Palin J, Pancin J, Parisel C, Pariset P, Pascovici G, Peghin R, Pellegri L, Perego A, Perrier S, Petcu M, Petkov P, Petrache C, Pierre E, Pietralla N, Pietri S, Pignanelli M, Piqueras I, Podolyak Z, Le Pouhalec P, Pouthas J, Pugnére D, Pucknell VFE, Pullia A, Quintana B, Raine R, Rainovski G, Ramina L, Rampazzo G, La Rana G, Rebeschini M, Recchia F, Redon N, Reese M, Reiter P, Regan PH, Riboldi S, Richer M, Rigato M, Rigby S, Ripamonti G, Robinson AP, Robin J, Roccaz J, Ropert J-A, Rossé B, Rossi Alvarez C, Rosso D, Rubio B, Rudolph D, Saillant F, Şahin E, Salomon F, Salsac M-D, Salt J, Salvato G, Sampson J, Sanchis E, Santos C, Schaffner H, Schlarb M, Scraggs DP, Seddon D, Şenyiǧit M, Sigward M-H, Simpson G, Simpson J, Slee M, Smith JF, Sona P, Sowicki B, Spolaore P, Stahl C, Stanios T, Stefanova E, Stézowski O, Strachan J, Suliman G, Söderström P-A, Tain JL, Tanguy S, Tashenov S, Theisen C, Thornhill J, Tomasi F, Toniolo N, Touzery R, Travers B, Triossi A, Tripon M, Tun-Lanoë KMM, Turcato M, Unsworth C, Ur CA, Valiente-Dobon JJ, Vandone V, Vardaci E, Venturelli R, Veronese F, Veyssiere C, Viscione E, Wadsworth R, Walker PM, Warr N, Weber C, Weisshaar D, Wells D, Wieland O, Wiens A, Wittwer G, Wollersheim HJ, Zocca F, Zamfir NV, Ziȩbliński M, Zucchiatti A. (2012) 'AGATA - Advanced GAmma Tracking Array'. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 668, pp. 26-58.
  • Grieser M, Blaum K, Fischer D, von Hahn R, Kreim S, Repnow R, Schwalm D, Shubina D, Winckler N, Wolf A, Litvinov YA, Artemyev A, Surzhykov A, Aumann T, Bosch F, Dillmann I, Dimopoulou C, Düllmann CE, Egelhof P, Estrade A, Geissel H, Gerl J, Grisenti RE, Heil M, Kiselev O, Kluge H-J, Kozhuharov C, Lestinsky M, Marta M, Mukha I, Nociforo C, Scheidenberger C, Simon H, Steck M, Stöhlker T, Winters DFA, Yakushev A, Raabe R, Huyse M, Neyens G, Van Duppen P, Blumenfeld Y, Wenander F, Bernardes A-P, Catherall R, Cederkäll J, Flanagan K, Fraser MA, Kadi Y, Kowalska M, Kurcewicz J, Pasini M, Siesling E, Stora T, Voulot D, Walker PM, Wildner E, Butler PA, Boston AJ, Joss DT, Page RD, Woods PJ, Aliotta M, Davinson T, Lotay G, Murphy AS, Andreyev A, Smith J, Atanasov D, Kröll T, Pietralla N, Balabanski D, Barzakh A, Batist L, Bernhardt D, Müller A, Schippers S, Billowes J, Cullen D, Freeman SJ, Bishop S, Mücher D, Borge M, Borzov I, Brandau C, Catford W, Podolyák Z, Regan P, Reed MW, Dracoulis G, Nörtershäuser W, Fraile L, Greenlees P, Jokinen A, Hagmann S, Petridis N, Reifarth R, Sanjari MS, Sonnabend K, Habs D, Hausmann M, Tarasov O, He JJ, Ma XW, Tu XL, Xu HS, Yuan YJ, Zhang YH, Jenkins D, Kay BP, Jonson B, Nilsson T, Kalantar-Nayestanaki N, Labiche M, Lemmon RC, Simpson J, Meng J, Sun B, Pfützner M, Reiter P, Riisager K, Rubio B, Savin DW, Schneider D, Schuch R, Schweikhard L, Trotsenko S, Suzaki F, Yamaguchi T, Volpe C, Zuber K. (2012) 'Storage ring at HIE-ISOLDE: Technical design report: Technical design report'. European Physical Journal: Special Topics, 207 (1), pp. 1-117.

    Abstract

    We propose to install a storage ring at an ISOL-type radioactive beam facility for the first time. Specifically, we intend to setup the heavy-ion, low-energy ring TSR at the HIE-ISOLDE facility in CERN, Geneva. Such a facility will provide a capability for experiments with stored secondary beams that is unique in the world. The envisaged physics programme is rich and varied, spanning from investigations of nuclear ground-state properties and reaction studies of astrophysical relevance, to investigations with highly-charged ions and pure isomeric beams. The TSR might also be employed for removal of isobaric contaminants from stored ion beams and for systematic studies within the neutrino beam programme. In addition to experiments performed using beams recirculating within the ring, cooled beams can also be extracted and exploited by external spectrometers for high-precision measurements. The existing TSR, which is presently in operation at the Max-Planck Institute for Nuclear Physics in Heidelberg, is well-suited and can be employed for this purpose. The physics cases as well as technical details of the existing ring facility and of the beam and infrastructure requirements at HIE-ISOLDE are discussed in the present technical design report. © 2012 EDP Sciences and Springer.

  • Britton R, Regan PH, Burnett J, Davies A. (2012) 'Determining the efficiency of a broad-energy HPGe detector using Monte Carlo simulations'. Journal of Radioanalytical and Nuclear Chemistry, , pp. 1-7.

    Abstract

    Broad-energy HPGe detectors have a useful range of 3 keV to 3 MeV, making them ideal for the assay of environmental samples. Such measurements however, are hindered by variations in the sample matrix, summing effects, and the Compton continuum. Detectors may be characterised by proprietary software in such a situation, however Monte-Carlo modelling is a useful, inexpensive alternative that also provides greater flexibility when determining the detector response and efficiency during a measurement. In the current work, a full GEANT4 model of a broad-energy HPGe detector is presented, and simulations of various samples are compared to experimental data. These are found to be accurate within 3 % at a confidence level of 95 % for energies from 30 to 3,000 keV, with greater variations below 100 keV due to an increased sensitivity to geometrical inaccuracies. © 2012 Akadémiai Kiadó, Budapest, Hungary.

  • Benzoni G, Morales AI, Bracco A, Camera F, Crespi FCL, Corsi AM, Leoni S, Million B, Nicolini R, Wieland O, Valiente-Dobón JJ, Gottardo A, de Angelis G, Napoli DR, Sahin E, Gottardo A, Lunardi S, Bracco A, Camera F, Crespi FCL, Corsi AM, Leoni S, Nicolini R, Gadea A, Algora A, Lunardi S, Bazzacco D, Farnea E, Menegazzo R, Mengoni D, Recchia F, Ur CA, Boutachkov P, Górska M, Pietri S, Weick H, Cortes ML, Domingo-Pardo C, Engert T, Farinon F, Geissel H, Gerl J, Goel N, Gregor E, Habermann T, Hoischen R, Kojouharov I, Kurz N, Naqvi F, Nociforo C, Prochazka A, Prokopowicz W, Schaffner H, Sharma A, Wollersheim H-J, Bruce AM, Denis Bacelar AM, Grebosz J, Podolyak Z, Regan PH, Al-Dahan N, Bowry M, Bunce M, Deo AY, Farrelly GF, Reed MW, Swan TPD, Walker PM, Pfützner M, Alcántara Núñez J, Ayyad Y, Benlliure J, Alkhomashi N, Allegro PRP, Ribas RV, Casarejos E, Doncel M, Dombradi Z, Eppinger K, Klupp S, Steiger K, Hoischen R, Rudolph D, Janik R, Sitar B, Strmen P, Szarka I, Mandal S, Siwal D, Naqvi F. (2012) 'First measurement of beta decay half-lives in neutron-rich Tl and Bi isotopes'. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics,

    Abstract

    Neutron-rich isotopes around lead, beyond N = 126, have been studied exploiting the fragmentation of an uranium primary beam at the FRS-RISING setup at GSI. For the first time β-decay half-lives of Bi and Tl isotopes have been derived. The half-lives have been extracted using a numerical simulation developed for experiments in high-background conditions. Comparison with state of the art models used in r-process calculations is given, showing a systematic underestimation of the experimental values, at variance from close-lying nuclei. © 2012 Elsevier B.V. All rights reserved.

  • Alharbi T, Mason PJR, Regan PH, Podolyák Z, Alazemi N, Britton R, Bunce MR, Gelletly W, Lintott J, Nakhostin M, Rice S, Townsley C, Wilson E, Mrginean N, Bucurescu D, Deleanu D, Filipescu D, Ghit D, Glodariu T, Ilie G, Mihai C, Mrginean R, Negret A, Stroe L, Sava T, Zamfir NV, Algora A, Bruce AM, Roberts OJ, Cooper N, Werner V, Kisyov S, Lalkovski S, Zhekova M, Liddick S, Mulholland K, Smith JF. (2012) 'Electromagnetic transition rate measurements in the N=80 isotone, Ce'. Journal of Physics: Conference Series, 381 (1)

    Abstract

    A study of intrinsic state halflife measurements in the N=80 nucleus Ce has been made using the Te( C,4n) Ce fusion evaporation reaction at beam energy of 56 MeV. The fast-timing gamma-ray coincidence method was used with a mixed LaBr (Ce)-HPGe array to establish the lifetimes of the yrast 6 state at 2294 keV, the I =5 state at 2218 keV, the I =11 state at 3943 keV and the 14 state at that at 5312 keV, all of which are in the sub nanosecond regime. Reduced transition probabilities have been calculated for the electromagnetic decays from these states. © Published under licence by IOP Publishing Ltd.

  • Wadsworth R, Singh BSN, Brock TS, Liu Z, Gottardo A, Woods PJ, Grawe H, Boutachkov P, Gorska M, Pietri S, Domingo-Pardo C, Caceres L, Engert T, Farinon F, Gerl J, Goel N, Hoischen R, Kojouharov I, Kurz N, Merchan E, Nociforo C, Prochazka A, Schaffner H, Weick H, Wollersheim H-J, Braun N, Blazhev A, Bettermann L, Finke F, Geibel K, Ilie G, Iwasaki H, Jolie J, Reiter P, Scholl C, Warr N, Rudolph D, Steer SJ, Podolyak Z, Regan PH, Atac A, Kaskas A, Eppinger K, Faestermann T, Gernhauser R, Hinke C, Krucken R, Grebosz J, Nyberg J, Soderstrom P-A, Pfutzner M, Rinta-Antila S, Nowacki F, Sieja K. (2012) 'Spin-gap isomer in Cd'. Journal of Physics: Conference Series, 381 (1)

    Abstract

    Evidence has been obtained for the existence of the long predicted 16 spin-gap isomer in Cd. The decay of the isomer was identified and studied following the use of an 850 MeV/u beam of Xe impinging on a Be target and the fragment recoil separator at the GSI Laboratory. Gamma decays from the fragments were detected using the RISING gamma ray array, in its stopped beam configuration, plus a silicon active stopper. The data obtained have been compared with shell model predictions, which indicate that the isoscalar neutron-proton interaction plays a key role in the formation of the isomer. © Published under licence by IOP Publishing Ltd.

  • Myalski S, Maj A, Kmiecik M, Bednarczyk P, Grebosz J, Podolyák Z, Regan PH, Garnsworthy AB, Pietri S, Steer SJ, Brandau C, Catford WN, Cullen IJ, Gelletly W, Jones GA, Liu Z, Shizuma T, Simons AJ, Walker PM, Becker F, Gerl J, Górska M, Grawe H, Kojouharov I, Schaffner H, Wollersheim HJ, Prokopowicz W, Doornenbal P, Geissel H, Kelic A, Kurz N, Saito T, Tachenov S, Werner-Malento E, Rudolph D, Cáceres L, Hoischen R, Montes F, Benzoni G, Wieland O, Camera F, Blank B, Bruce AM, Jungclaus A, Dombradi Z, Estevez E, Kurtukian-Nieto T, Heinz A, Ilie G, Kondev FG, Lalkovski S, Pfützner M, Schwertel S. (2012) 'Study of isomer production rates for A = 142-152 and Z = 62-67 in fragmentation of a relativistic 208Pb beam'. Acta Physica Polonica B, 43 (2), pp. 253-259.

    Abstract

    We have investigated nuclear fragmentation reactions of a relativistic Pb beam.Ten isomeric states for nuclei with A = 142-152 and Z = 62-67 were observed. Measured isomeric ratios were compared, together with values from other experiments, with prediction of theoretical models. The discrepancies between the experimental and theoretical values were discussed in terms of transitions by-passing the isomer that are not included in the models.

  • Mason PJR, Alharbi T, Regan PH, Podolyàk Z, Bowry M, Nakhostin M, Simpson EC, Mrginean N, Bucurescu D, Cta-Danil G, Cta-Danil I, Deleanu D, Filipescu D, Glodariu T, Ghiţ D, Mrginean R, Mihai C, Negret A, Pascu S, Sava T, Stroe L, Suliman G, Zamfir NV, Alkhomashi N, Bender PC, Bostan M, Kusoglu A, Bruce AM, Triguero CR, Erduran MN, Chakrabarti R, Ghugre SS, Detistov P, Garg U, Sinha AK. (2012) 'Half-life of the I 4 intruder state in P using LaBr :Ce fast timing'. Journal of Physics: Conference Series, 381 (1)

    Abstract

    The half-life of the I 4 intruder state at 2305 keV in has been measured using γ-ray coincident fast timing with LaBr :Ce scintillation detectors. Excited states in P were populated in the O( O,pn) P reaction at a beam energy of 36 MeV at the Tandem Laboratory at the National Institute of Physics and Nuclear Engineering, Bucharest, Romania. A half-life of t ∼ 2 ns was obtained for the 4 state, giving an M2 reduced transition probability consistent with similar transitions in this mass region and confirming the intruder-parity nature of the state. © Published under licence by IOP Publishing Ltd.

  • Anagnostatou V, Regan PH, Werner V, Xu FR, Dong GX, Bunce MR, McCarthy D, Bettermann L, Boniwell C, Casperson R, Chevrier R, Cooper N, Heinz A, Paurstein P, Radeck D, Smith MK, Williams E. (2011) 'Electromagnetic transition rates in (100,101)Pd using the Recoil Doppler Shift Technique.'. Appl Radiat Isot,

    Abstract

    The quadrupole deformations for the low-lying states in the transitional nuclei (100,101)Pd have been deduced through the measurement of their electric quadrupole transition probabilities using the Recoil Distance Doppler Shift Method. The nuclei were studied using a 268MeV (80)Se beam impinging on a thin, self-supporting (24)Mg target. States in (100)Pd and (101)Pd populated by the four and three neutron evaporation channels respectively, with reaction gamma-rays detected using the SPEEDY gamma-ray detection array. The recoiling nuclei were stopped in a copper foil and gamma-ray coincidence data taken at 10 separate target-stopper distances between 35μm and 750μm. The mean-lifetimes for the lowest lying 2(+) (in (100)Pd) and 15/2(-) (in (101)Pd) states were measured to be 13.3(9)ps and 10.8(8)ps respectively. These data are compared with predictions from nuclear Total Routhian Surface calculations, which are found to agree with the experimentally deduced values to within 10%.

  • Regan P. (2011) 'A taste of the exotic'. PHYSICS WORLD, 24 (11), pp. 37-41.
  • Singh BSN, Liu Z, Wadsworth R, Grawe H, Brock TS, Boutachkov P, Braun N, Blazhev A, Gorska M, Pietri S, Rudolph D, Domingo-Pardo C, Steer SJ, Atac A, Bettermann L, Caceres L, Eppinger K, Engert T, Faestermann T, Farinon F, Finke F, Geibel K, Gerl J, Gernhaeuser R, Goel N, Gottardo A, Grebosz J, Hinke C, Hoischen R, Ilie G, Iwasaki H, Jolie J, Kaskas A, Kojouharov I, Kruecken R, Kurz N, Merchan E, Nociforo C, Nyberg J, Pfuetzner M, Prochazka A, Podolyak Z, Regan PH, Reiter P, Rinta-Antila S, Scholl C, Schaffner H, Soderstrom P-A, Warr N, Weick H, Wollersheim H-J, Woods PJ, Nowacki F, Sieja K. (2011) '16(+) Spin-Gap Isomer in Cd-96'. PHYSICAL REVIEW LETTERS, 107 (17) Article number ARTN 172502
  • Al-Sulaiti H, Alkhomashi N, Al-Dahan N, Al-Dosari M, Bradley DA, Bukhari S, Matthews M, Regan PH, Santawamaitre T. (2011) 'Determination of the natural radioactivity in Qatarian building materials using high-resolution gamma-ray spectrometry'. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 652 (1), pp. 915-919.
  • Santawamaitre T, Malain D, Al-Sulaiti HA, Matthews M, Bradley DA, Regan PH. (2011) 'Study of natural radioactivity in riverbank soils along the Chao Phraya river basin in Thailand'. SORMA XII 2010: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 652 (1), pp. 920-924.
  • Morales AI, Benlliure J, Agramunt J, Algora A, Alkhomashi N, Alvarez-Pol H, Boutachkov P, Bruce AM, Caceres LS, Casarejos E, Bacelar AMD, Doornenbal P, Dragosavac D, Farrelly G, Gadea A, Gelletly W, Gerl J, Gorska M, Grebosz J, Kojouharov I, Molina F, Perez-Loureiro D, Pietri S, Podolyak Z, Regan PH, Rubio B, Shaffner H, Steer SJ, Tashenov S, Verma S, Wollersheim HJ. (2011) 'Synthesis of N=127 isotones through (p,n) charge-exchange reactions induced by relativistic Pb-208 projectiles'. PHYSICAL REVIEW C, 84 (1) Article number ARTN 011601
  • Nomura K, Otsuka T, Rodriguez-Guzman R, Robledo LM, Sarriguren P, Regan PH, Stevenson PD, Podolyak Z. (2011) 'Spectroscopic calculations of the low-lying structure in exotic Os and W isotopes'. PHYSICAL REVIEW C, 83 (5) Article number ARTN 054303
  • Pietri S, Jungclaus A, Gorska M, Grawe H, Pfuetzner M, Caceres L, Detistov P, Lalkovski S, Modamio V, Podolyak Z, Regan PH, Rudolph D, Walker J, Werner-Malento E, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grebosz J, Kojouharov I, Kurz N, Prokopowicz W, Schaffner H, Wollersheim HJ, Andgren K, Benlliure J, Benzoni G, Bruce AM, Casarejos E, Cederwall B, Crespi FCL, Hadinia B, Hellstrom M, Hoischen R, Ilie G, Khaplanov A, Kmiecik M, Kumar R, Maj A, Mandal S, Montes F, Myalski S, Simpson G, Steer SJ, Tashenov S, Wieland O. (2011) 'First observation of the decay of a 15(-) seniority v=4 isomer in Sn-128'. PHYSICAL REVIEW C, 83 (4) Article number ARTN 044328
  • Hoischen R, Rudolph D, Ma HL, Montuenga P, Hellstrom M, Pietri S, Podolyak Z, Regan PH, Garnsworthy AB, Steer SJ, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Gerl J, Gorska M, Grebosz J, Kojouharov I, Kurz N, Prokopowicz W, Schaffner H, Wollersheim HJ, Andersson L-L, Atanasova L, Balabanski DL, Bentley MA, Blazhev A, Brandau C, Brown JR, Fahlander C, Johansson EK, Jungclaus A. (2011) 'Isomeric mirror states as probes for effective charges in the lower pf shell'. JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 38 (3) Article number ARTN 035104
  • Boutachkov P, Górska M, Grawe H, Pietri S, Domingo-Pardo C, Farinon F, Kojuharov I, Kurz N, Nociforo C, Prochazka A, Cáceres L, Engert T, Gerl J, Goel N, Schaffner H, Weick H, Wollersheim H-J, Merchán E, Braun N, Blazhev A, Bettermann L, Finke F, Geibel K, Ilie G, Iwasaki H, Jolie J, Reiter P, Scholl C, Warr N, Brock T, Singh BSN, Wadsworth R, Liu Z, Gottardo A, Woods P, Faestermann T, Eppinger K, Hinke C, Krücken R, Grebosz J, Podolyák Z, Steer S, Regan P, Hoischen R, Rudolph D, Nyberg J, Söderström P-A, Pfützner M, Rinta-Antila S, Ataç A. (2011) 'Isomer and β-decay spectroscopy of T=1 isotopes below the N=Z=50 shell gap'. Journal of Physics: Conference Series, 312 (SECTION 9)

    Abstract

    The RISING setup at the GSI-FRS facility was used to investigate the isomer and beta decays in N∼Z∼50 Cd, Ag and Pd isotopes. A preliminary analysis of the data has revealed new results on the T=1, Pd, Ag and Cd isotopes. In Pd a new high-spin isomer was observed, whilst in Ag 3 new isomeric states were identified, including core-excited states. In Cd a new high-energy isomeric γ-ray transition is observed, thus enabling us to confirm the previous spin assignment for the core-excited 12 isomer.

  • Boutachkov P, Górska M, Grawe H, Blazhev A, Braun N, Brock TS, Liu Z, Nara Singh BS, Wadsworth R, Pietri S. (2011) 'High-spin isomers in 96Ag: Excitations across the Z=38 and Z=50, N=50 closed shells'. Physical Review C - Nuclear Physics, 84 (4) Article number 044311
  • Steer SJ, Podolyak Z, Pietri S, Gorska M, Grawe H, Maier KH, Regan PH, Rudolph D, Garnsworthy AB, Hoischen R. (2011) 'Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a (208)Pb beam'. PHYSICAL REVIEW C, 84 (4) Article number ARTN 044313
  • Nara Singh BS, Liu Z, Wadsworth R, Grawe H, Brock TS, Boutachkov P, Braun N, Blazhev A, Górska M, Pietri S, Rudolph D, Domingo-Pardo C, Steer SJ, Ataç A, Bettermann L, Cáceres L, Eppinger K, Engert T, Faestermann T, Farinon F, Finke F, Geibel K, Gerl J, Gernhäuser R, Goel N, Gottardo A, Grabosz J, Hinke C, Hoischen R, Ilie G, Iwasaki H, Jolie J, Kaşkaş A, Kojouharov I, Krücken R, Kurz N, Merchán E, Nociforo C, Nyberg J, Pfützner M, Prochazka A, Podolyák Z, Regan PH, Reiter P, Rinta-Antila S, Scholl C, Schaffner H, Söderström P-A, Warr N, Weick H, Wollersheim H-J, Woods PJ, Nowacki F, Sieja K. (2011) '16+ spin-gap isomer in Cd96'. Physical Review Letters, 107 (17) Article number 172502
  • Bruce AM, Lalkovski S, Bacelar AMD, Gorska M, Pietri S, Podolyak Z, Shi Y, Walker PM, Xu FR, Bednarczyk P, Caceres L, Casarejos E, Cullen IJ, Doornenbal P, Farrelly GF, Garnsworthy AB, Geissel H, Gelletly W, Gerl J, Grebosz J, Hinke C, Ilie G, Jaworski G, Kojouharov I, Kurz N, Myalski S, Palacz M, Prokopowicz W, Regan PH, Schaffner H, Steer S, Tashenov S, Wollersheim HJ. (2010) 'Shape coexistence and isomeric states in neutron-rich Tc-112 and Tc-113'. PHYSICAL REVIEW C, 82 (4) Article number ARTN 044312
  • Nakhostin M, Podolyak Z, Regan PH, Walker PM. (2010) 'A digital method for separation and reconstruction of pile-up events in germanium detectors'. REVIEW OF SCIENTIFIC INSTRUMENTS, 81 (10) Article number ARTN 103507
  • Naqvi F, Gorska M, Caceres L, Jungclaus A, Pfuetzner M, Grawe H, Nowacki F, Sieja K, Pietri S, Werner-Malento E, Regan PH, Rudolf D, Podolyak Z, Jolie J, Andgren K, Beck T, Bednarczyk P, Benlliure J, Benzoni G, Bruce AM, Casarejos E, Cederwall B, Crespi FCL, Detistov P, Dombradi Z, Doornenbal P, Geissel H, Gerl J, Grebosz J, Hadinia B, Hellstrom M, Hoischen R, Ilie G, Khaplanov A, Kojouharov I, Kmiecik M, Kurz N, Lalkovski S, Maj A, Mandal S, Modamio V, Montes F, Myalski S, Prokopowicz W, Reiter P, Schaffner H, Simpson G, Sohler D, Steer SJ, Tashenov S, Walker J, Wieland O, Wollersheim HJ. (2010) 'Isomer spectroscopy of Cd-127'. PHYSICAL REVIEW C, 82 (3) Article number ARTN 034323
  • Simpson EC, Tostevin JA, Podolyak Z, Regan PH, Steer SJ. (2010) 'Differential isomeric ratios following two-proton knockout from Pb-208'. PHYSICAL REVIEW C, 82 (3) Article number ARTN 037602
  • Soderstrom P-A, Nyberg J, Regan PH, Algora A, de Angelis G, Ashley SF, Aydin S, Bazzacco D, Casperson RJ, Catford WN, Cederkall J, Chapman R, Corradi L, Fahlander C, Farnea E, Fioretto E, Freeman SJ, Gadea A, Gelletly W, Gottardo A, Grodner E, He CY, Jones GA, Keyes K, Labiche M, Liang X, Liu Z, Lunardi S, Marginean N, Mason P, Menegazzo R, Mengoni D, Montagnoli G, Napoli D, Ollier J, Pietri S, Podolyak Z, Pollarolo G, Recchia F, Sahin E, Scarlassara F, Silvestri R, Smith JF, Spohr K-M, Steer SJ, Stefanini AM, Szilner S, Thompson NJ, Tveten GM, Ur CA, Valiente-Dobon JJ, Werner V, Williams SJ, Xu FR, Zhu JY. (2010) 'Spectroscopy of neutron-rich Dy-168,Dy-170: Yrast band evolution close to the NpNn valence maximum'. PHYSICAL REVIEW C, 81 (3) Article number ARTN 034310
  • Daugas JM, Faul T, Grawe H, Pfuetzner M, Grzywacz R, Lewitowicz M, Achouri NL, Angelique JC, Baiborodin D, Bentida R, Beraud R, Borcea C, Bingham CR, Catford WN, Emsallem A, de France G, Grzywacz KL, Lemmon RC, Jimenez MJL, Santos FDO, Regan PH, Rykaczewski K, Sauvestre JE, Sawicka M, Stanoiu M, Sieja K, Nowacki F. (2010) 'Low-lying isomeric levels in Cu-75'. PHYSICAL REVIEW C, 81 (3) Article number ARTN 034304
  • Brock TS, Nara Singh BS, Boutachkov P, Braun N, Blazhev A, Liu Z, Wadsworth R, Górska M, Grawe H, Pietri S, Domingo-Pardo C, Rudolph D, Steer SJ, Ataç A, Bettermann L, Cáceres L, Engert T, Eppinger K, Faestermann T, Farinon F, Finke F, Geibel K, Gerl J, Gernhäuser R, Goel N, Gottardo A, Grȩbosz J, Hinke C, Hoischen R, Ilie G, Iwasaki H, Jolie J, Kaşkaş A, Kojuharov I, Krücken R, Kurz N, Merchán E, Nociforo C, Nyberg J, Pfützner M, Prochazka A, Podolyák Z, Regan PH, Reiter P, Rinta-Antila S, Schaffner H, Scholl C, Söderström P-A, Warr N, Weick H, Wollersheim H-J, Woods PJ. (2010) 'Observation of a new high-spin isomer in Pd94'. Physical Review C - Nuclear Physics, 82 (6)
  • Benzoni G, Azaiez F, Stefan GI, Franchoo S, Battacharyya S, Borcea R, Bracco A, Corradi L, Curien D, De France G, Dombradi Z, Fioretto E, Grevy S, Ibrahim F, Leoni S, Montanari D, Mukherjee G, Pollarolo G, Redon N, Regan PH, Schmitt C, Sletten G, Sohlers D, Stanoiu M, Szilner S, Verney D. (2010) 'Study of collisions of the radioactive Ne-24 beam at 7.9 MeV/u on Pb-208'. EUROPEAN PHYSICAL JOURNAL A, 45 (3), pp. 287-292.
  • Garnsworthy AB, Regan PH, Pietri S, Sun Y, Xu FR, Rudolph D, Gorska M, Caceres L, Podolyak Z, Steer SJ, Hoischen R, Heinz A, Becker F, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grawe H, Grebosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopwicz W, Saito T, Schaffner H, Tachenov S, Werner-Malento E, Wollersheim HJ, Benzoni G, Blank B, Brandau C, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Gelletly W, Ilie G, Jolie J, Jones GA, Jungclaus A, Kmiecik M, Kondev FG, Kurtukian-Nieto T, Lalkovski S, Liu Z, Maj A, Myalski S, Pfuetzner M, Schwertel S, Shizuma T, Simons AJ, Walker PM, Wieland O. (2009) 'Isomeric states in neutron-deficient A similar to 80-90 nuclei populated in the fragmentation of Ag-107'. PHYSICAL REVIEW C, 80 (6) Article number ARTN 064303
  • Al-Dahan N, Podolyak Z, Regan PH, Gorska M, Grawe H, Maier KH, Gerl J, Pietri SB, Wollersheim HJ, Alkhomashi N, Deo AY, Bacelar AMD, Farrelly G, Steer SJ, Bruce AM, Boutachkov P, Domingo-Pardo C, Algora A, Benlliure J, Bracco A, Calore E, Casarejos E, Cullen IJ, Detistov P, Dombradi Z, Doncel M, Farinon F, Gelletly W, Geissel H, Goel N, Grebosz J, Hoischen R, Kojouharov I, Kurz N, Lalkovski S, Leoni S, Molina F, Montanari D, Morales AI, Musumarra A, Napoli DR, Nicolini R, Nociforo C, Prochazka A, Prokopowicz W, Rubio B, Rudolph D, Schaffner H, Strmen P, Szarka I, Swan T, Thomas JS, Valiente-Dobon JJ, Verma S, Walker PM, Weick H. (2009) 'Nuclear structure "southeast" of Pb-208: Isomeric states in Hg-208 and Tl-209'. PHYSICAL REVIEW C, 80 (6) Article number ARTN 061302
  • Alkhomashi N, Regan PH, Podolyak Z, Pietri S, Garnsworthy AB, Steer SJ, Benlliure J, Caserejos E, Casten RF, Gerl J, Wollersheim HJ, Grebosz J, Farrelly G, Gorska M, Kojouharov I, Schaffner H, Algora A, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Bacelar AMD, Cullen IJ, Caceres L, Doornenbal P, Estevez ME, Fujita Y, Gelletly W, Hoischen R, Kumar R, Kurz N, Lalkovski S, Liu Z, Mihai C, Molina F, Morales AI, Muecher D, Prokopowicz W, Rubio B, Shi Y, Tamii A, Tashenov S, Valiente-Dobon JJ, Walker PM, Woods PJ, Xu FR. (2009) 'beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes'. PHYSICAL REVIEW C, 80 (6) Article number ARTN 064308
  • Simpson EC, Tostevin JA, Podolyak Z, Regan PH, Steer SJ. (2009) 'Population of low-seniority isomeric states of Hg-206 by two-proton knockout reactions at relativistic energies'. PHYSICAL REVIEW C, 80 (6) Article number ARTN 064608
  • Berant Z, Oster E, Casperson RJ, Wolf A, Werner V, Heinz A, Casten RF, Gurdal G, McCutchan EA, Brenner DS, Terry JR, Winkler R, Williams E, Qian J, Schmidt A, Smith MK, Ahn T, Beausang CW, Regan PH, Ross T, Bunce M, Darakchieva B, Meyer DA, LeBlanc J, Dudziak K, Bauer C, Henning G. (2009) 'g factor of the 2(1)(+) state of Hf-172'. PHYSICAL REVIEW C, 80 (5) Article number ARTN 057303
  • Gorska M, Caceres L, Grawe H, Pfuetzner M, Jungclaus A, Pietri S, Werner-Malento E, Podolyak Z, Regan PH, Rudolph D, Detistov R, Lalkovski S, Modamio V, Walker J, Beck T, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grebosz J, Hoischen R, Kojouharov I, Kurz N, Prokopowicz W, Schaffner H, Weick H, Wollersheim H-J, Andgren K, Benlliure J, Benzoni G, Bruce AM, Casarejos E, Cederwall B, Crespi FCL, Hadinia B, Hellstrom M, Ilie G, Khaplanov A, Kmiecik M, Kumar R, Maj A, Mandal S, Montes F, Myalski S, Simpson GS, Steer SJ, Tashenov S, Wieland O, Dombradi Z, Reiter R, Sohler D. (2009) 'Evolution of the N=82 shell gap below Sn-132 inferred from core excited states in In-131'. PHYSICS LETTERS B, 672 (4-5), pp. 313-316.
  • Podolyak Z, Steer SJ, Pietri S, Xu FR, Liu HL, Regan PH, Rudolph D, Garnsworthy AB, Hoischen R, Gorska M, Gerl J, Wollersheim HJ, Kurtukian-Nieto T, Benzoni G, Shizuma T, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Geissel H, Grebosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tashenov S, Heinz A, Pfutzner M, Jungclaus A, Balabanski DL, Brandau C, Bruce AM, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Gelletly W, Ilie G, Jolie J, Jones GA, Kmiecik M, Kondev FG, Kruecken R, Lalkovski S, Liu Z, Maj A, Myalski S, Schwertel S, Walker PM, Werner-Malento E, Wieland O. (2009) 'Weakly deformed oblate structures in Os-198(76)122'. PHYSICAL REVIEW C, 79 (3) Article number ARTN 031305
  • Podolyak Z, Farrelly GF, Regan PH, Garnsworthy AB, Steer SJ, Gorska M, Benlliure J, Casarejos E, Pietri S, Gerl J, Wollersheim HJ, Kumar R, Molina F, Algora A, Alkhomashi N, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Caceres L, Cullen IJ, Bacelar AMD, Doornenbal P, Estevez ME, Fujita Y, Gelletly W, Geissel H, Grawe H, Grebosz J, Hoischen R, Kojouharov I, Lalkovski S, Liu Z, Maier KH, Mihai C, Muecher D, Rubio B, Schaffner H, Tamii A, Tashenov S, Valiente-Dobon JJ, Walker PM, Woods PJ. (2009) 'Proton-hole excitation in the closed shell nucleus Au-205'. PHYSICS LETTERS B, 672 (2), pp. 116-119.
  • Kumar R, Molina FG, Pietri S, Casarejos E, Algora A, Benlliure J, Doornenbal P, Gerl J, Gorska M, Kojouharov I, Podolyak Z, Prokopowicz W, Regan PH, Rubio B, Schaffner H, Tashenov S, Wollersheim H-J. (2009) 'Testing of a DSSSD detector for the stopped RISING project'. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 598 (3), pp. 754-758.
  • Alkhomashi N, Regan PH, Podolyák Z, Pietri S, Garnsworthy AB, Steer SJ, Benlliure J, Caserejos E, Casten RF, Gerl J, Wollersheim HJ, Grebosz J, Farrelly G, Górska M, Kojouharov I, Schaffner H, Algora A, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Bacelar AMD, Cullen IJ, Cáceres L, Doornenbal P, Estevez ME, Fujita Y, Gelletly W, Hoischen R, Kumar R, Kurz N, Lalkovski S, Liu Z, Mihai C, Molina F, Morales AI, Mücher D, Prokopowicz W, Rubio B, Shi Y, Tamii A, Tashenov S, Valiente-Dobón JJ, Walker PM, Woods PJ, Xu FR. (2009) 'β - Dcopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes'. Physical Review C - Nuclear Physics, 80 (6) Article number 064308 , pp. 1-12.
  • Caceres L, Gorska M, Jungclaus A, Pfutzner M, Grawe H, Nowacki F, Sieja K, Pietri S, Rudolph D, Podolyak Z, Regan PH, Werner-Malento E, Detistov P, Lalkovski S, Modamio V, Walker J, Andgren K, Bednarczyk P, Benlliure J, Benzoni G, Bruce AM, Casarejos E, Cederwall B, Crespi FCL, Doornenbal P, Geissel H, Gerl J, Grebosz J, Hadinia B, Hellstrom M, Hoischen R, Ilie G, Khaplanov A, Kmiecik M, Kojouharov I, Kumar R, Kurz N, Maj A, Mandal S, Montes F, Martinez-Pinedo G, Myalski S, Prokopowicz W, Schaffner H, Simpson GS, Steer SJ, Tashenov S, Wieland O, Wollersheim HJ. (2009) 'Spherical proton-neutron structure of isomeric states in Cd-128'. PHYSICAL REVIEW C, 79 (1) Article number ARTN 011301
  • Higashiyama K, Yoshinaga N, Regan P. (2009) 'Shell model study of neutron rich Se and Ge isotopes'. AIP Conference Proceedings, 1090, pp. 599-600.
  • Al-Dahan N, Podolyák Z, Regan PH, Steer SJ, Bacelar AMD, Alkhomashi N, Górska M, Gerl J, Wollersheim HJ, Pietri SB, Grawe H, Deo AY, Farrelly G, Boutachkov P, Domingo-Pardo C, Algora A, Benlliure J, Bracco A, Bruce AM, Calore E, Casarejos E, Cullen IJ, Detistov P, Dombrádi Z, Doncel M, Farinon F, Geissel H, Gelletly W, Goel N, Grebosz J, Hoischen R, Kojouharov I, Kurz N, Lalkovski S, Leoni S, Molina F, Montanari D, Morales AI, Musumarra A, Napoli DR, Nicolini R, Nociforo C, Prochazka A, Prokopowicz W, Rubio B, Rudolph D, Schaffner H, Strmen P, Szarka I, Swan T, Valiente-Dobon JJ, Verma S, Walker PM, Weick H. (2009) 'Isomeric states in 208Hg and 209Tl populated in fragmentation of 238U'. Acta Physica Polonica B, 40 (3), pp. 871-874.

    Abstract

    The nuclear structure of neutron-rich N > 126 nuclei has been investigated following their production via relativistic projectile fragmentation of a E/A = 1 GeV (238)U beam on a Be target. The preliminary analysis indicates the presence of previously unreported isomeric states in the N = 128 isotones (208)Hg and (209)Tl.

  • Steer SJ, PodolyÁk ZS, Pietri S, GÓrska M, Farrelly GF, Regan PH, Rudolph D, Garnsworthy AB, Hoischen R, Gerl J, Wollersheim HJ, Grawe H, Maier KH, Becker F, Bednarczyk P, CÁceres L, Doornenbal P, Geissel H, Grbosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tashenov S, Heinz A, Kurtukian-Nieto T, Benzoni G, PfÜtzner M, Jungclaus A, Balabanski DL, Brandau C, Brown A, Bruce AM, Catford WN, Cullen IJ, DombrÁdi Z, Estevez ME, Gelletly W, Ilie G, Jolie J, Jones GA, Kmiecik M, Kondev FG, KrÜcken R, Lalkovski S, Liu Z, Maj A, Myalski S, Schwertel S, Shizuma T, Walker PM, Werner-Malento E, Wieland O. (2009) 'Isomeric decay studies in neutron-rich N ≈ 126 nuclei'. International Journal of Modern Physics E, 18 (4), pp. 1002-1007.

    Abstract

    Heavy neutron-rich nuclei were populated via relativistic energy fragmentation of a E/A=1 GeV 208Pb beam. The nuclei of interest were selected and identified by a fragment separator and then implanted in a passive plastic stopper. Delayed rays following internal isomeric decays were detected by the RISING array. Experimental information was obtained on a number of nuclei with Z=73-80 (Ta-Hg), providing new information both on the prolate-oblate transitional region as well as on the N=126 closed shell nuclei.

  • Steer SJ, Podolyak Z, Pietri S, Gorska M, Regan PH, Rudolph D, Werner-Malento E, Garnsworthy AB, Hoischen R, Gerl J, Wollersheim HJ, Maier KH, Grawe H, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Geissel H, Greabosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tashenov S, Heinz A, Pfuetzner M, Kurtukian-Nieto T, Benzoni G, Jungclaus A, Balabanski DL, Brandau C, Brown BA, Bruce AM, Catford WN, Cullen IJ, Dombradi Z, Estevez ME, Gelletly W, Ilie G, Jolie J, Jones GA, Kmiecik M, Kondev FG, Kruecken R, Lalkovski S, Liu Z, Maj A, Myalski S, Schwertel S, Shizuma T, Walker PM, Wieland O. (2008) 'Single-particle behavior at N=126: Isomeric decays in neutron-rich Pt-204'. PHYSICAL REVIEW C, 78 (6) Article number ARTN 061302
  • Garnsworthy AB, Regan PH, Caceres L, Pietri Y, Sun Y, Rudolph D, Gorska M, Podolyak Z, Steer SJ, Hoischen R, Heinz A, Becker F, Bednarczyk R, Doornenbal P, Geissel H, Gerl J, Grawe H, Grebosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tachenov S, Werner-Malento E, Wollersheim HJ, Benzoni G, Blank BB, Brandau C, Bruce AM, Camera F, Catford WN, Cullen IJ, Dornbradi Z, Estevez E, Gelletly W, Ilie G, Jolie J, Jones GA, Jungclaus A, Kmiecik M, Kondev FG, Kurtukian-Nieto T, Lalkovski S, Liu Z, Maj A, Myalski S, Pfutzner M, Schwertel S, Shizuma T, Simons AJ, Walker PM, Wieland O, Xu FR. (2008) 'Neutron-proton pairing competition in N = Z nuclei: Metastable state decays in the proton dripline nuclei (82)(41)Nb and (86)(43)TC (vol 660, pg 326, 2008)'. PHYSICS LETTERS B, 668 (5), pp. 460-460.
  • Yoshinaga N, Higashiyama K, Regan PH. (2008) 'High-spin structure of neutron-rich Se, As, Ge, and Ga isotopes'. PHYSICAL REVIEW C, 78 (4) Article number ARTN 044320
  • Garnsworthy AB, Lister CJ, Regan PH, Blank BB, Cullen IJ, Gros S, Henderson DJ, Jones GA, Liu Z, Seweryniak D, Shumard BR, Thompson NJ, Williams SJ, Zhu S. (2008) 'Optimizing recoil-isomer tagging with the Argonne fragment mass analyzer'. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 594 (2), pp. 184-187.
  • Rudolph D, Hoischen R, Hellstrom M, Pietri S, Podolyak Z, Regan PH, Garnsworthy AB, Steer SJ, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Gerl J, Gorska M, Grebosz J, Kojouharov I, Kurz N, Prokopowicz W, Schaffner H, Wollersheim HJ, Andersson L-L, Atanasova L, Balabanski DL, Bentley MA, Blazhev A, Brandau C, Brown JR, Fahlander C, Johansson EK, Jungclaus A, Lenzi SM. (2008) 'Isospin symmetry and proton decay: Identification of the 10(+) isomer in (54)Ni'. PHYSICAL REVIEW C, 78 (2) Article number ARTN 021301
  • McCutchan EA, Casten RF, Werner V, Williams E, Winkler R, Wolf A, Berant Z, Gurdal G, Qian J, Ai H, Amon L, Beausang CW, Brenner DS, Cakirli RB, Casperson RJ, Fitzpatrick CR, Frank D, Garnsworthy AB, Heinz A, Luettke R, Mertz AF, Oktem Y, Pietralla N, Regan PH, Shoraka B, Terry JR, Thompson NJ. (2008) 'Enhanced mixing of intrinsic states in deformed Hf nuclei'. PHYSICAL REVIEW C, 77 (5) Article number ARTN 054304
  • Garnsworthy AB, Regan PH, Caceres L, Pietri S, Sun Y, Rudolph D, Gorska M, Podolyak Z, Steer SJ, Hoischen R, Heinz A, Becker F, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grawe H, Grebosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tachenov S, Werner-Malento E, Wollersheim HJ, Benzoni G, Blank BB, Brandau C, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Gelletly W, Ilie G, Jolie J, Jones GA, Jungclaus A, Kmiecik M, Kondev FG, Kurtukian-Nieto T, Lalkovski S, Liu Z, Maj A, Myalski S, Pfutzner M, Schwertel S, Shizuma T, Simons AJ, Walker PM, Wielandi O, Xu FR. (2008) 'Neutron-proton pairing competition in N = Z nuclei: Metastable state decays in the proton dripline nuclei Nb-82(41) and Tc-86(43)'. PHYSICS LETTERS B, 660 (4), pp. 326-330.
  • Garnsworthy AB, Regan PH, Cáceres L, Pietri S, Sun Y, Rudolph D, Górska M, Podolyák Z, Steer SJ, Hoischen R, Heinz A, Becker F, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grawe H, Grȩbosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tachenov S, Werner-Malento E, Wollersheim HJ, Benzoni G, Blank BB, Brandau C, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombrádi Z, Estevez E, Gelletly W, Ilie G, Jolie J, Jones GA, Jungclaus A, Kmiecik M, Kondev FG, Kurtukian-Nieto T, Lalkovski S, Liu Z, Maj A, Myalski S, Pfützner M, Schwertel S, Shizuma T, Simons AJ, Walker PM, Wieland O, Xu FR. (2008) 'Erratum to: "Neutron-proton pairing competition in N = Z nuclei: Metastable state decays in the proton dripline nuclei 82 41Nb and 86 43Tc"'. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 668 (5), pp. 460-460.
  • Regan PH, Alkhomashi N, Al-Dahan N, PodolyÁk Z, Pietri SB, Steer SJ, Garnsworthy AB, Suckling EB, Stevenson PD, Farrelly G, Cullen IJ, Gelletly W, Walker PM, Benlliure J, Morales AI, Casajeros E, Estevez ME, Gerl J, GÓrska M, Wollersheim HJ, Boutachkov P, Tashenov S, Kojouharov I, Schaffner H, Kurz N, Kumar R, Rubio B, Algora A, Molina F, Grebosz J, Benzoni G, MÜcher D, Bruce AM, Bacelar AMD, Lalkovski S, Fujita Y, Tamii A, Hoischen R, Liu Z, Woods PJ, Mihai C, Valiente-DobÓn JJ. (2008) 'First results with the rising active stopper'. International Journal of Modern Physics E, 17 (SUPPL. 1), pp. 8-20.
  • Rudolph D, Hoischen R, Hellstrom M, Pietri S, Podolyak Z, Regan PH, Garnsworthy AB, Steer SJ, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Gerl J, Gorska M, Grebosz J, Kojouharov I, Kurz N, Prokopowicz W, Schaffner H, Wollersheim HJ, Andersson L-L, Atanasova L, Balabanski DL, Bentley MA, Blazhev A, Brandau C, Brown JR, Fahlander C, Johansson EK, Jungclaus A. (2008) 'Evidence for an isomeric 3/2(-) state in (53)Co'. EUROPEAN PHYSICAL JOURNAL A, 36 (2), pp. 131-138.
  • Bucurescu D, Rusu C, Marginean N, Ur CA, de Angelis G, Corradi L, Bazzacco D, Beghini S, Della Vedova F, Duchene G, Farnea E, Faul T, Fioretto E, Gadea A, Gelletly W, Guiot B, Ionescu-Bujor M, Iordachescu A, Landown SD, Lenzi SM, Lunardi S, Mason P, Mihai C, Marginean R, Menegazzo R, Montagnoli G, Napoli D, Podolyak Z, Regan PH, Scarlassara F, Stefanini AM, Suliman G, Szilner S, Trotta M, Valiente-Dobon JJ, Zhang YH. (2007) 'gamma-ray spectroscopy of the neutron-rich nuclei (89)Rb, (92)Y, and (93)Y with multinucleon transfer reactions'. PHYSICAL REVIEW C, 76 (6) Article number ARTN 064301
  • Ashley SF, Regan PH, Andgren K, McCutchan EA, Zamfir NV, Amon L, Cakirli RB, Casten RF, Clark RM, Gelletly W, Guerdal G, Keyes KL, Meyer DA, Erduran MN, Papenberg A, Pietralla N, Plettner C, Rainovski G, Ribas RV, Thomas NJ, Vinson J, Warner DD, Werner V, Williams E, Liu HL, Xu FR. (2007) 'Intrinsic state lifetimes in (103)Pd and (106,107)Cd'. PHYSICAL REVIEW C, 76 (6) Article number ARTN 064302
  • Wolf A, Berant Z, Heinz A, Werner V, McCutchan EA, Gurdal G, Cakirli RB, Oktem Y, Ai J, Amon L, Beausang CW, Brenner DS, Casten RF, Casperson RJ, Dusling K, Fitzpatrick CR, Gransworthy AB, Pietralla N, Qian J, Regan PH, Thompson NJ, Williams E, Winkler R. (2007) 'g factor of the 2(1)(+) state of (170)Hf'. PHYSICAL REVIEW C, 76 (4) Article number ARTN 047308
  • Jones GA, Regan PH, Walker PM, Podolyak Z, Stevenson PD, Carpenter MP, Carroll JJ, Chakrawarthy RS, Chowdhury P, Garnsworthy AB, Janssens RVF, Khoo TL, Kondev FG, Lane GJ, Liu Z, Seweryniak D, Thompson NJ, Zhu S, Williams SJ. (2007) 'Identification of a high-spin isomer in (99)Mo'. PHYSICAL REVIEW C, 76 (4) Article number ARTN 047303
  • Jungclaus A, Caceres L, Gorska M, Pfutzner M, Pietri S, Werner-Malento E, Grawe H, Langanke K, Martinez-Pinedo G, Nowacki F, Poves A, Cuenca-Garcia JJ, Rudolph D, Podolyak Z, Regan PH, Detistov P, Lalkovski S, Modamio V, Walker J, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grebosz J, Kojouharov I, Kurz N, Prokopowicz W, Schaffner H, Wollersheim HJ, Andgren K, Benlliure J, Benzoni G, Bruce AM, Casarejos E, Cederwall B, Crespi FCL, Hadinia B, Hellstrom M, Hoischen R, Ilie G, Jolie J, Khaplanov A, Kmiecik M, Kumar R, Maj A, Mandal S, Montes F, Myalski S, Simpson GS, Steer SJ, Tashenov S, Wieland O. (2007) 'Observation of isomeric decays in the r-process waiting-point nucleus Cd-130(82)'. PHYSICAL REVIEW LETTERS, 99 (13) Article number ARTN 132501
  • Bucurescu D, Mǎrginean N, Ur CA, Ionescu-Bujor M, Iordǎchescu A, Mihai C, Mǎrginean R, Suliman G, Rusu C, De Angelis G, Corradi L, Della Vedova F, Fioretto E, Gadea A, Guiot B, Napoli D, Stefanini AM, Szilner S, Valiente-Dobón JJ, Bazzacco D, Beghini S, Farnea E, Mason P, Menegazzo R, Duchene G, Faul T, Gelletly W, Landown SD, Podolyák Z, Regan PH, Lenzi SM, Lunardi S, Montagnoli G, Scarlassara F, Trotta M, Zhang YH. (2007) 'γ-ray spectroscopy of the neutron-rich nuclei Rb89, Y92, and Y93 with multinucleon transfer reactions'. Physical Review C - Nuclear Physics, 76 (6)

    Abstract

    The positive-parity yrast states in the Rb89, Y92, and Y93 nuclei were studied using γ-ray spectroscopy with heavy-ion induced reactions. In the multinucleon transfer reactions Pb208+Zr90 (590 MeV) and U238+Se82 (505 MeV), several γ-ray transitions were identified in these nuclei by means of coincidences between recoiling ions identified with the PRISMA spectrometer and γ rays detected with the CLARA γ-ray array in thin target experiments. Level schemes were subsequently determined from triple-γ coincidences recorded with the GASP array in a thick target experiment, in the reactions produced by a 470 MeV Se82 beam with a Os192 target. The observed level schemes are compared to shell-model calculations. © 2007 The American Physical Society.

  • Doornenbal P, Reiter P, Blazhev A, Richard A, Seidlitz M, Striepling T, Warr N, Grawe H, Banu A, Beck T, Becker F, Bednarczyk P, Caceres L, Geissel H, Gerl J, Górska M, Grȩbosz J, Kavatsyuk M, Kavatsyuk O, Kelic A, Kojouharov I, Kurz N, Lozeva R, Montes F, Prokopowicz W, Saito N, Saito T, Schaffner H, Tashenov S, Weick H, Werner-Malento E, Winkler M, Wollersheim H-J, Brandau C, Bürger A, Hübel H, Al-Khatib A, Bringel P, Chmel S, Neußer A, Rudolph D, Andersson L-L, Fahlander C, Hellström M, Hoischen R, Johansson EK, Regan PH, Garnsworthy AB, Pietri S, Podolyák Z, Steer SJ, Kmieciek M, Maj A, Meczynski W, Jungclaus A, Walker J, Atanasova L, Pfützner M, Balabanski DL, Bentley MA, Brown JR, Benzoni G, Bracco A, Brambilla S, Camera F, Crespi FCL, Million B, Wieland O, Clément E, Görgen A, Korten W, Hammond G, Honma H, Mandal S, Nowacki F, Otsuka T, Utsuno T, Wheldon C. (2007) 'RISING: Gamma-ray spectroscopy with radioactive beams at GSI'. AIP Conference Proceedings, 891, pp. 99-107.

    Abstract

    The Rare Isotope Spectroscopic INvestigation at GSI (RISING) project is a major pan-European collaboration. Its physics aims are the studies of exotic nuclear matter with abnormal proton-to-neutron ratios compared with naturally occurring isotopes. RISING combines the FRagment Separator (FRS) which allows relativistic energies and projectile fragmentation reactions with EUROBALL Ge Cluster detectors for γ spectroscopic research. The RISING setup can be used in two different configurations. Either the nuclei of interest are investigated after being stopped or the heavy ions hit a secondary target at relativistic energies and the thereby occurring excitations are studied. For the latter case, MINIBALL Ge detectors and the HECTOR array are used in addition. Example achievements of the Fast Beam setup are presented and compared to various shell model calculations, while for the Stopped Beam setup initial results are shown. © 2007 American Institute of Physics.

  • Regan PH, Garnsworthy AB, Pietri S, Caceres L, Gorska M, Rudolph D, Podolyak Z, Steer SJ, Hoischen R, Gerl J, Wollersheim HJ, Grebosz J, Schaffner H, Prokopwicz W, Kojouharov I, Becker F, Bednarczyk P, Doornenball P, Geissel H, Grawe H, Kelic A, Kurz N, Montes F, Saito T, Tashenov S, Werner-Malento E, Heinz A, Atanasova L, Balabanski D, Benzoni G, Blank B, Blazhev A, Brandau C, Bruce AM, Camera F, Cullen IJ, Estevez ME, Fahlander C, Gelletly W, Ilie G, Jungclaus A, Jolie J, Kurtukian-Nieto T, Liu Z, Kmiecik M, Maj A, Myalski S, Schwertel S, Shizuma T, Simons AJ, Walker PM, Wieland O. (2007) 'Isomer spectroscopy using relativistic projectile fragmentation at the N=Z line for A similar to 80 -> 90.'. NUCLEAR PHYSICS A, Rio de Janeiro, BRAZIL: 787, pp. 491C-498C.
  • Jones GA, Regan PH, Podolyak Z, Yoshinaga N, Higashiyama K, de Angelis G, Zhang YH, Gadea A, Ur CA, Axiotis M, Bazzacco D, Bucurescu D, Farnea E, Gelletly W, Ionescu-Bujor M, Iordachescu A, Kroell T, Langdown SD, Lenzi S, Lunardi S, Marginean N, Martinez T, Medina NH, Menegazzo R, Napoli DR, Quintana B, Rubio B, Rusu C, Schwenger R, Tonev D, Doban JJV, von Oertzen W. (2007) 'Yrast studies of (80,82)Se using deep-inelastic reactions'. PHYSICAL REVIEW C, 76 (5) Article number ARTN 054317
  • Myalski S, Kmiecik M, Maj A, Regan PH, Garnsworthy AB, Pietri S, Rudolph D, Podolyak Z, Steer SJ, Becker F, Bednarczyk P, Gerl J, Gorska M, Grawe H, Kojouharov I, Schaffner H, Wollersheim HJ, Prokopowicz W, Grebosz J, Benzoni G, Blank B, Brandau C, Bruce AM, Caceres L, Camera F, Catford WN, Cullen IJ, Dombradi Z, Doornenbal P, Estevez E, Geissel H, Gelletly W, Heinz A, Hoischen R, Ilie G, Jones GA, Jungclaus A, Kelic A, Kondev FG, Kurtukian-Nieto T, Kurz N, Lalkovski S, Liu Z, Montes F, Pfuetzner M, Saito T, Shizuma T, Simons AJ, Schwertel S, Tachenov S, Walker PM, Werner-Malento E, Wieland O. (2007) 'Isomeric ratio for the I-pi=8(+) yrast state in Pd-96 produced in the relativistic fragmentation of Ag-107'. ACTA PHYSICA POLONICA B, Zakopane, POLAND: 38 (4), pp. 1277-1282.
  • Podolyak Z, Steer SJ, Pietri S, Werner-Malento E, Regan PH, Rudolph D, Garnsworthy AB, Hoischen R, Gorska M, Gerl J, Wollersheim HJ, Kurtukian-Nieto T, Benzoni G, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Geissel H, Grebosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tashenov S, Heinz A, Pfutzner M, Hellstrom M, Jungclaus A, Andersson L-L, Atanasova L, Balabanski DL, Bentley A, Blank B, Blazhev A, Brandau C, Brown J, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Fahlander C, Gelletly W, Ilie G, Johansson EK, Jolie J, Jones GA, Kmiecik M, Kondev FG, Lalkovski S, Liu Z, Maj A, Myalski S, Shizuma T, Simons AJ, Schwertel S, Walker PM, Wieland O, Brown BA. (2007) 'Isomeric decay studies around Pt-204 and Tb-148'. EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS, Cortina, ITALY: 150, pp. 165-168.
  • Podolyak Z, Steer S, Pietri S, Regan P, Rudolph D, Garnsworthy A, Hoischen R, Werner-Malento E, Gerl J, Gorska M, Wollersheim H-J. (2006) 'NUCL 40-Nuclear structure and reaction studies: Isomers used as a tool'. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 232
  • Wheldon C, Valiente-Dobon JJ, Regan PH, Pearson CJ, Wu CY, Smith JF, Macchiavelli AO, Cline D, Chakrawarthy RS, Chapman R, Cromaz M, Fallon P, Freeman SJ, Gelletly W, Goergen AG, Hayes AB, Hua H, Langdown SD, Lee IY, Liang X, Podolyak Z, Sletten G, Teng R, Ward D, Warner DD, Yamamoto AD. (2006) 'Observation of an isomeric state in Au-197'. PHYSICAL REVIEW C, 74 (2) Article number ARTN 027303
  • Podolyak Z, Gerl J, Hellstrom M, Becker F, Gladnishki KA, Gorska M, Kelic A, Kopatch Y, Mandal S, Regan PH, Schmidt KH, Walker PM, Wollersheim HJ, Banu A, Benzoni G, Boardman H, Casarejos E, Ekman J, Geissel H, Grawe H, Hohn D, Kojouharov I, Leske J, Lozeva R, Mineva MN, Neyens G, Page RD, Pearson CJ, Portillo M, Rudolph D, Saito N, Schaffner H, Sohler D, Summerer K, Valiente-Dobon JJ, Wheldon C, Weick H, Winkler M. (2006) 'High angular momentum states populated in fragmentation reactions'. PHYSICS LETTERS B, 632 (2-3), pp. 203-206.
  • Podolyak Z, Gerl J, Hellstroem M, Becker F, Gladnishki KA, Gorska M, Kelic A, Kopatch Y, Mandal S, Regan PH, Schmidt K-H, Walker PM, Wollersheim HJ, Banu A, Benzoni G, Boardman H, Casarejos E, Ekman J, Geissel H, Grawe H, Hohn D, Kojouharov I, Leske J, Lozeva R, Mineva MN, Neyens G, Page RD, Pearson CJ, Portillo M, Rudolph D, Saito N, Schaffner H, Sohler D, Summerer K, Valiente-Dobon JJ, Wheldon C, Weick H, Winkler M, Harissopulos S, Demetriou P, Julin R. (2006) 'Neutron-deficient N approximate to 126 nuclei produced in U-238 fragmentation: Population of high-spin states'. Frontiers in Nuclear Structure Astrophysics, and Reactions: FINUSTAR, Kos, GREECE: 831, pp. 114-118.
  • Andgren K, Ashley SF, Regan PH, Thomas NJ, McCutchan EA, Zamfir NV, Casten RF, Gürdal G, Meyer DA, Plettner C, Vinson J, Werner V, Williams E, Amon L, Cakirli RB, Erduran MN, Clark RM, Keyes KL, Papenberg A, Pietralla N, Rainovski G, Ribas RV, Warner DD. (2006) 'Recoil distance method lifetime measurements in Cd and Pd'. AIP Conference Proceedings, 831, pp. 391-393.

    Abstract

    Preliminary lifetime values have been measured for a number of near-yrast states in the odd-A transitional nuclei Cd and Pd. The reaction used to populate the nuclei of interest was Mo( C,3nxα)Cd, Pd, with the beam delivered by the tandem accelerator of the Wright Nuclear Structure Laboratory at an incident beam energy of 60 MeV. Our experiment was aimed at the investigation of collective excitations built on the unnatural parity, ν h orbital, specifically by measuring the B(E2) values of decays from the excited levels built on this intrinsic structure, using the Doppler Recoil Distance Method. We report lifetimes and associated transition probabilities for decays from the 15/2 and the 19/2 states in Cd and the first measurement of the 15/2 state in Pd. These results suggest that neither a simple rotational or vibrational interpretation is sufficient to explain the observed structures. © 2006 American Institute of Physics.

  • Daugas JM, Bélier G, Girod M, Goutte H, Méot V, Perru O, Roig O, Sauvestre JE, Sawicka M, Pfützner M, Grzywacz R, Zylicz J, Matea I, Giovinazzo J, Grawe H, Becker F, Mayet P, Bingham C, Grzywacz-Jones KL, Rykaczewski K, Achouri NL, Angélique JC, Baiborodin D, De France G, Gorgiev G, Lewitowicz M, Lopez-Jimenez MJ, De Oliveira-Santos F, Saint-Laurent MG, Sorlin O, Stefan I, Stodel C, Bentida R, Béraud R, Emsallem A, Borcea C, Borcea R, Buta A, Dragulescu E, Negoita F, Bouchez E, Theisen C, Catford WN, Regan PH, Hammache F, Ibrahim F, Stanoiu M, Verney D, Lemmon RC, Sletten G. (2006) 'Isomeric island in the vicinity of Fe'. AIP Conference Proceedings, 831, pp. 427-429.

    Abstract

    An island of isomers have recently been observed on both sides of the N=40 shell below the Ni isotopes. Isomeric states in the Fe and Fe allow the knowledge of the single particle structure around the νg shell. Moreover, the excitation energy of the first 2+ and 4+ states in the Fe have been established by β-γ correlation. The evolution of the structure of the Fe isotopes going far away from the valley of stability is, for the first time, given for N>40. © 2006 American Institute of Physics.

  • Benzoni G, Leoni S, Bracco A, Azaiez F, Franchoo S, Ibrahim F, Stanoiu M, Verney D, Battacharyya S, De France G, Grevy S, Iulian S, Mukherjee G, Navin A, Rejmund M, Borcea R, Corradi L, Fioretto E, Szilner S, Curien D, Dombradi Z, Sohler D, Pollarolo G, Redon N, Schmitt C, Regan PH, Sletten G. (2006) 'In-beam γ spectroscopy using DIC with a radioactive Ne beam'. AIP Conference Proceedings, 853, pp. 49-54.

    Abstract

    The preferred production mechanisms used to investigate the region of light nuclei, such as O, Ne and F, have been transfer reactions and, more recently, two-step fragmentation. Multi-nucleon transfer reactions can be an important complementary tool to populate this mass region. Deep-inelastic and multi-nucleon transfer reactions have been largely used to study heavier systems, however no information is yet available regarding the effectiveness of these reaction mechanisms going towards lighter nuclei. In this proceeding we present promising preliminary results from an experiment performed with a radioactive Ne beam from SPIRAL facility at GANIL using the VAMOS spectrometer in conjunction with the EXOGAM array. © 2006 American Institute of Physics.

  • Mohammadi S, Gelletly W, Gadea A, Longdown S, Podolyák Z, Regan PH, Valiente Dobon J-J, Walker PM, De Angrlis G, Axiotis M, Farnea E, Kröll T, Marginean N, Martinez T, Bazzacco D, Brandolini F, Lunardi S, Ur CA, Zhang YH, Bizzeti PG, Broda R, Bucurescu D, Ionescu-Bujor M, Iordachescu A, Medina N, Quintana B, Rubio B. (2006) 'Yrast states in Os nuclei'. International Journal of Modern Physics E, 15 (8), pp. 1797-1802.

    Abstract

    Yrast states in neutron rich nuclei Os and Os have been populated using the deep-inelastic reaction Se + Os at 460 MeV beam bombarding energy. A thick Os target (>50 mg/cm) with 0.2 mm Ta backing was used to stop all of the recoils in the target, minimising the broadening of the lines due to Doppler shift. High fold γ-γ coincidences were aquired with the 4π spectrometer GASP detector array. Three and two dimensional gamma-ray matrices were used to construct level schemes of the nuclei of interest up to an yrast state of 22. © World Scientific Publishing Company.

  • Balabanski DL, Gladnishki KA, Lo Bianco G, Saltarelli A, Zamfir NV, McCutchan EA, Ai H, Casten RF, Heinz A, Meyer DA, Plettner C, Qian J, Werner V, Williams E, Akkus B, Amon L, Cakirli RB, Erduran MN, Oktem Y, Ashley SF, Regan PH, Rainovski G. (2006) 'Evidence for X(5) critical point symmetry in Ce'. International Journal of Modern Physics E, 15 (8), pp. 1735-1740.

    Abstract

    Lifetimes of excited states in Ce were measured using the recoil distance Doppler-shift (RDDS) and the Doppler-shift attenuation (DSAM) methods. The experiments were performed at the Wright Nuclear Structure Laboratory of Yale University. Excited states of Ce were populated in the Mo(Si,4n) reaction at 120 MeV and the nuclear γ decay was measured with an array of eight Clover detectors positioned at forward and backward angles. The deduced yrast transition strengths together with the energies of the levels within the ground-state (gs) band of Ce are in agreement with the predicted values for the X(5) critical point symmetry. Thus, we suggest Ce as a benchmark X(5) nucleus in the mass A ≈ 130 region. © World Scientific Publishing Company.

  • Descovich M, Nolan PJ, Boston AJ, Dobson J, Gros S, Cresswell JR, Simpson J, Lazarus I, Regan PH, Valiente-Dobon JJ, Sellin P, Pearson CJ. (2005) 'The position response of a large-volume segmented germanium detector'. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 553 (3), pp. 512-521.
  • Stevenson PD, Brine MP, Podolyak Z, Regan PH, Walker PM, Stone JR. (2005) 'Shape evolution in the neutron-rich tungsten region'. PHYSICAL REVIEW C, 72 (4) Article number ARTN 047303
  • Regan P, Stevenson P. (2005) 'NUSTAR 2005'. Journal of Physics G: Nuclear and Particle Physics, 31 (10)
  • Regan P, Stevenson P. (2005) 'Preface - NUSTAR 2005'. JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 31 (10)
  • Wolf A, Berant Z, Zamfir NV, Brenner DS, McCutchan EA, Ai H, Casten RF, Dusling K, Heinz A, Meyer DA, Millman EA, Pietralla N, Plettner C, Qian J, Regan PH, Swanson D, Vinson J, Williams E, Winkler R. (2005) 'g factor of the 2(1)(+) state of Er-160'. PHYSICAL REVIEW C, 72 (2) Article number ARTN 027301
  • Bucurescu D, Podolyak Z, Rusu C, de Angelis G, Zhang YH, Cata-Danil G, Cata-Danil I, Ivascu M, Marginean N, Marginean R, Mihailescu LC, Suliman GA, Regan PH, Gelletly W, Langdown SD, Dobon JJV, Bazzacco D, Lunardi S, Ur CA, Axiotis M, Gadea A, Farnea E, Ionescu-Bujor M, Iordachescu A, Kroll T, Martinez T, Bizzetti PG, Broda R, Medina NH, Quintana B, Rubio B. (2005) 'High-spin states in the nuclei Y-91 and Nb-95'. PHYSICAL REVIEW C, 71 (3) Article number ARTN 034315
  • Caamano M, Walker PM, Regan PH, Pfutzner M, Podolyak Z, Gerl J, Hellstrom M, Mayet P, Mineva MN, Aprahamian A, Benlliure J, Bruce AM, Butler PA, Gil DC, Cullen DM, Doring J, Enqvist T, Fox C, Narro JG, Geissel H, Gelletly W, Giovinazzo J, Gorska M, Grawe H, Grzywacz R, Kleinbohl A, Korten W, Lewitowicz M, Lucas R, Mach H, O'Leary CD, De Oliveira F, Pearson CJ, Rejmund F, Rejmund M, Sawicka M, Schaffner H, Schlegel C, Schmidt K, Schmidt KH, Stevenson PD, Theisen C, Vives F, Warner DD, Wheldon C, Wollersheim HJ, Wooding S, Xu F, Yordanov O. (2005) 'Isomers in neutron-rich A approximate to 190 nuclides from Pb-208 fragmentation'. EUROPEAN PHYSICAL JOURNAL A, 23 (2), pp. 201-215.
  • Caamaño M, Walker PM, Regan PH, Podolyák Z, Garcés Narro J, Gelletly W, Pearson CJ, Stevenson PD, Wheldon C, Wooding S, Xu F, Pfützner M, Sawicka M, Gerl J, Hellström M, Mayet P, Cortina Gil D, Döring J, Enqvist T, Geissel H, Górska M, Grawe H, Kleinböhl A, Schaffner H, Schlegel C, Schmidt K, Schmidt K-H, Vivès F, Wollersheim HJ, Yordanov O, Mineva MN, Aprahamian A, Benlliure J, Bruce AM, Butler PA, Cullen DM, Fox C, O'Leary CD, Giovinazzo J, Grzywacz R, Korten W, Lucas R, Theisen C, Lewitowicz M, De Oliveira F, Mach H, Rejmund F, Rejmund M, Warner DD. (2005) 'Isomers in neutron-rich A ≈ 190 nuclides from Pb fragmentation'. European Physical Journal A, 23 (2), pp. 201-215.

    Abstract

    Relativistic projectile fragmentation of Pb has been used to produce isomers in neutron-rich, A ≈ 190 nuclides. A forward-focusing spectrometer provided ion-by-ion mass and charge identification. The detection of γ-rays emitted by stopped ions has led to the assignment of isomers in Ta, W, Re, Re, Os, Ir, Ir, Pt, Pt, Pt and Au, with half-lives ranging from approximately 10 ns to 1 ms. Tentative isomer information has been found also for Er, Er, Hf, Re, Re and Ir. In most cases, time-correlated, singles γ-ray events provided the first spectroscopic data on excited states for each nuclide. In Pt and Pt, the assignments are supported by γ-γ coincidences. Isomeric ratios provide additional information, such as half-life and transition energy constraints in particular cases. The level structures of the platinum isotopes are discussed, and comparisons are made with isomer systematics. © Società, Italiana, di Fisica/Springer-Verlag 2004.

  • Smith MB, Walker PM, Chakrawarthy RS, Ball GC, Cunningham E, Hackman G, Koopmans K, Sarazin F, Scraggs HC, Regan PH, Austin RAE, Waddington JC, Washbrook B, Carroll JJ, Propri R, Finlay P, Grinyer GF, Hyland B, Phillips AA, Schumaker MA, Svensson CE, Garrett PE, Kulp WD, Wood JL, Leslie JR, Shizuma T, von Schwarzenberg J, Ward D, Zganjar EF. (2004) 'Studies of high-K isomers at TRIUMF-ISAC'. Nuclear Physics A, 746 (1-4 SPEC.ISS.)

    Abstract

    The properties of high-K isomers have been investigated by measuring γ rays from a source of the 31-year Hf isomer and from the decay of implanted Lu beams. Low-intensity transitions have been identified in the decay of Hf, demonstrating a consistent extension of K-hindrance systematics to higher multipolarities, and elucidating the spin-dependence of the mixing between the two K = 8 bands. A search is underway for new isomers in Lu and the preliminary results of the analysis are reported. © 2004 Elsevier B.V. All rights reserved.

  • Andreyev AN, Butler PA, Page RD, Appelbe DE, Jones GD, Joss DT, Herzberg RD, Regan PH, Simpson J, Wadsworth R. (2004) 'GEANT Monte Carlo simulations for the GREAT spectrometer'. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 533 (3), pp. 422-434.
  • Zhang YH, Podolyak Z, de Angelis G, Gadea A, Ur C, Lunardi S, Marginean N, Rusu C, Schwengner R, Kroll T, Napoli DR, Menegazzo R, Bazzacco D, Farnea E, Lenzi S, Martinez T, Axiotis M, Tonev D, Gelletly W, Langdown S, Regan PH, Dobon JJV, von Oertzen W, Rubio B, Quintana B, Medina N, Broda R, Bucurescu D, Ionescu-Bujor M, Iordachescu A. (2004) 'Stability of the N=50 shell gap in the neutron-rich Rb, Br, Se, and Ge isotones'. PHYSICAL REVIEW C, 70 (2) Article number ARTN 024301
  • Wheldon C, Valiente-Dobon JJ, Regan PH, Pearson CJ, Wu CY, Smith JF, Macchiavelli AO, Cline D, Chakrawarthy RS, Chapman R, Cromaz M, Fallon P, Freeman SJ, Gorgen A, Gelletly W, Hayes A, Hua H, Langdown SD, Lee IY, Liang X, Podolyak Z, Sletten G, Teng R, Ward D, Warner DD, Yamamoto AD. (2004) 'Multi-quasi particle states in W-184 via multi-nucleon transfer'. EUROPEAN PHYSICAL JOURNAL A, 20 (3), pp. 365-369.
  • Regan PH, Valiente-Dobon JJ, Wheldon C, Wu CY, Smith JF, Macchiavelli AO, Cline D, Chakrawarthy RS, Chapman R, Cromaz M, Fallon P, Freeman SJ, Gorgen A, Gelletly W, Hayes A, Langdown SD, Lee IY, Liang X, Pearson CJ, Podolyak Z, Teng R, Ward D, Warner DD, Yamamoto AD. (2004) 'Production of exotic nuclear isomers in multi-nucleon transfer reactions'. LASER PHYSICS LETTERS, 1 (6), pp. 317-324.
  • Schunck N, Dudek J, Gozdz A, Regan PH. (2004) 'Tetrahedral symmetry in ground and low-lying states of exotic A similar to 110 nuclei'. PHYSICAL REVIEW C, 69 (6) Article number ARTN 061305
  • Ressler JJ, Beausang CW, Ai H, Amro H, Caprio MA, Casten RF, Hecht AA, Langdown SD, McCutchan EA, Meyer DA, Regan PH, Sciacchitano MJS, Yamamoto A, Zamfir NV. (2004) 'Isomer decay tagging in the heavy nuclei: Ra-210 and Ra-209'. PHYSICAL REVIEW C, 69 (3) Article number ARTN 034331
  • Ressler JJ, Casten RF, Zamfir NV, Beausang CW, Cakirli RB, Ai H, Amro H, Caprio MA, Hecht AA, Heinz A, Langdown SD, McCutchan EA, Meyer DA, Plettner C, Regan PH, Sciacchitano MJS, Yamamoto AD. (2004) 'Transition from the seniority regime to collective motion'. PHYSICAL REVIEW C, 69 (3) Article number ARTN 034317
  • Gladnishki KA, Podolyak Z, Regan PH, Gerl J, Hellstrom M, Kopatch Y, Mandal S, Gorska M, Page RD, Wollersheim HJ, Banu A, Benzoni G, Boardman H, La Commara M, Ekman J, Fahlander C, Geissel H, Grawe H, Kaza E, Korgul A, Matos M, Mineva MN, Pearson CJ, Plettner C, Rudolph D, Scheidenberger C, Schmidt KH, Shishkin V, Sohler D, Summerer K, Valiente-Dobon JJ, Walker PM, Weick H, Winkler M, Yordanov O. (2004) 'Angular momentum population in the projectile fragmentation of U-238 at 750 MeV/nucleon'. PHYSICAL REVIEW C, 69 (2) Article number ARTN 024617
  • Al-Garni SD, Regan PH, Walker PM, Roeckl E, Kirchner R, Xu FR, Batist L, Blazhev A, Borcea R, Cullen DM, Doring J, El-Masri HM, Narro JG, Grawe H, La Commara M, Mazzoechi C, Mukha I, Pearson CJ, Plettner C, Schmidt K, Schmidt-Ott WD, Shimbara Y, Wheldon C, Wood R, Wooding SC. (2004) 'Evidence for a high-spin beta-decaying isomer in Lu-177'. PHYSICAL REVIEW C, 69 (2) Article number ARTN 024320
  • Valiente-Dobón JJ, Regan PH, Wheldon C, Gelletly W, Langdown SD, Pearson CJ, Podolyák Z, Yamamoto AD, Wu CY, Cline D, Hayes A, Hua H, Teng R, Yoshinaga N, Higashiyama K, Smith JF, Chakrawarthy RS, Freeman SJ, Chapman R, Liang X, Cromaz M, Fallon P, Görgen A, Lee IY, Macchiavelli AO, Ward D, Sletten G, Warner DD. (2004) 'Ba studied via deep-inelastic collisions: Identification of the (νh) isomer'. Physical Review C - Nuclear Physics, 69 (2), pp. 243161-2431613.

    Abstract

    A multinucleon transfer reaction between a thin self-supporting Pt target and an 850 MeV X6 beam has been used to populate and study the structure of the N=80 isotone Ba. Making use of time-correlated γ-ray spectroscopy, evidence for an I=(10) isomeric state has been found with a measured half-life of 91±2 ns. Prompt-delayed correlations have also enabled the tentative measurement of the near-yrast states which lie above the isomer. Shell-model calculations suggest that the isomer has a structure which can be assigned predominantly as (vh ) . The results are discussed in terms of standard and pair-truncated shell-model calculations, and compared to the even-Z N=80 isotones ranging from Sn to Er. A qualitative explanation of the observed dramatic decrease in the B(E2:10→8) value for the N=80 isotones at Ba is given in terms of the increasing single-hole energy of the h neutron configuration as the proton subshell is filled. The angular momentum transfer to the binary fragments in the reaction has also been investigated in terms of the average total γ-ray fold versus the scattering angle of the recoils.

  • McCutchan EA, Zamfir NV, Caprio MA, Casten RF, Amro H, Beausang CW, Brenner DS, Hecht AA, Hutter C, Langdown SD, Meyer DA, Regan PH, Ressler JJ, Yamamoto AD. (2004) 'Low spin states in Yb-162 and the X(5) critical point symmetry'. PHYSICAL REVIEW C, 69 (2) Article number ARTN 024308
  • Mohammadi S, Podolyák Z, Gelletly W, Longdown S, Regan PH, Valiente Dobón J-J, Walker PM, De Angelis G, Axiotis M, Farnea E, Gadea A, Kröll T, Marginean N, Martinez T, Zhang YH, Bazzacco D, Brandolini F, Lunardi S, Ur CA, Bizzeti PG, Broda R, Bucurescu D, Ionescu-Bujor M, Iordachescu A, Medina NH, Quintana B, Rubio B. (2004) 'High-spin states populated in deep-inelastic reactions'. Brazilian Journal of Physics, 34 (3 A), pp. 792-795.

    Abstract

    High spin states in the neutron rich Os and Os nuclei have been populated using the Se + Os deep-inelastic reaction. The level schemes are extended up to spin I ≈21. The observed new structures are tentatively interpreted as fragments of rotational bands built on multi-quasiparticle configurations.

  • Rath AK, Stevenson RD, Regan PH, Xu FR, Walker RM. (2003) 'Self-consistent description of dysprosium isotopes in the doubly midshell region'. PHYSICAL REVIEW C, 68 (4) Article number ARTN 044315
  • Regan PH, Yamamoto AD, Xu FR, Wu CY, Macchiavelli AO, Cline D, Smith JF, Freeman SJ, Valiente-Dobon JJ, Andgren K, Chakrawarthy RS, Cromaz M, Fallon P, Gelletly W, Gorgen A, Hayes A, Hua H, Langdown SD, Lee IY, Pearson CJ, Podolyak Z, Teng R, Wheldon C. (2003) 'Binary-reaction spectroscopy of Mo-99,Mo-100: Intruder alignment systematics in N=57 and N=58 isotones'. PHYSICAL REVIEW C, 68 (4) Article number ARTN 044313
  • Williams SJ, Bentley MA, Warner DD, Bruce AM, Cameron JA, Carpenter MP, Fallon P, Frankland L, Gelletly W, Janssens RVF, Joss DT, O'Leary CD, Lister CJ, Poves A, Regan PH, Reiter P, Rubio B, Seweryniak D, Svensson CE, Vincent SM. (2003) 'Anomalous Coulomb matrix elements in the f(7/2) shell'. PHYSICAL REVIEW C, 68 (1) Article number ARTN 011301
  • Clough AS, Regan PH. (2003) 'Undergraduate courses with an integral research year'. EUROPEAN JOURNAL OF PHYSICS, 24 (3) Article number PII S0143-0807(03)58882-1 , pp. 321-328.
  • Regan PH, Beausang CW, Zamfir NV, Casten RF, Zhang JY, Yamamoto AD, Caprio MA, Gurdal G, Hecht AA, Hutter C, Krucken R, Langdown SD, Meyer DA, Ressler JJ. (2003) 'Signature for vibrational to rotational evolution along the yrast line'. PHYSICAL REVIEW LETTERS, 90 (15) Article number ARTN 152502
  • Caprio MA, Zamfir NV, McCutchan EA, Casten RF, Berant Z, Amro H, Barton CJ, Beausang CW, Brenner DS, Cooper JR, Gill RL, Gurdal G, Hecht AA, Hutter C, Krucken R, Meyer DA, Novak JR, Pietralla N, Regan PH, Ressler JJ. (2003) 'Measurement of 2(1)(+) level lifetimes in Yb-162 and Er-162 by fast electronic scintillation timing'. EUROPEAN PHYSICAL JOURNAL A, 16 (2), pp. 177-180.
  • Georgiev G, Neyens G, Hass M, Balabanski DL, Bingham C, Borcea C, Coulier N, Coussement R, Daugas JM, De France G, Santos FD, Gorska M, Grawe H, Grzywacz R, Lewitowicz M, Mach H, Matea I, Page RD, Pfutzner M, Penionzhkevich YE, Podolyak Z, Regan PH, Rykaczewski K, Sawicka M, Smirnova NA, Sobolev YG, Stanoiu M, Teughels S, Vyvey K. (2002) 'g factor measurements of mu s isomeric states in neutron-rich nuclei around Ni-68 produced in projectile-fragmentation reactions'. JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 28 (12) Article number PII S0954-3899(02)54753-8 , pp. 2993-3006.
  • Jimenez MJL, Blank B, Chartier M, Czajkowski S, Dessagne P, de France G, Giovinazzo J, Karamanis D, Lewitowicz M, Maslov V, Miehe C, Regan PH, Stanoiu M, Wiescher M. (2002) 'Half-life measurements of proton-rich Kr-78 fragments'. PHYSICAL REVIEW C, 66 (2) Article number ARTN 025803
  • Yamamoto AD, Regan PH, Beausang CW, Xu FR, Caprio MA, Casten RF, Gurdal G, Hecht AA, Hutter C, Krucken R, Langdown SD, Meyer D, Ressler JJ, Zamfir NV. (2002) 'High-j proton and neutron alignments in gamma-soft Ru-101'. PHYSICAL REVIEW C, 66 (2) Article number ARTN 024302
  • Pfutzner M, Regan PH, Walker PM, Caamano M, Gerl J, Hellstrom M, Mayet P, Schmidt KH, Podolyak Z, Mineva MN, Aprahamian A, Benlliure J, Bruce AM, Butler PA, Gil DC, Cullen DM, Doring J, Enquist T, Fox C, Garces Narro J, Geissel H, Gelletly W, Giovinazzo J, Gorska M, Grawe H, Grzywacz R, Kleinbohl A, Korten W, Lewitowicz M, Lucas R, Mach H, O'Leary CD, De Oliveira F, Pearson CJ, Rejmund F, Rejmund M, Sawicka M, Schaffner H, Schlegel C, Schmidt K, Theisen C, Vives F, Warner DD, Wheldon C, Wollersheim HJ, Wooding S. (2002) 'Angular momentum population in the fragmentation of Pb-208 at 1 GeV/nucleon'. PHYSICAL REVIEW C, 65 (6) Article number ARTN 064604
  • Vincent SM, Regan PH, Owen KE, Pearson CJ, Clough AS. (2002) 'In-beam performance of CdZnTe detectors for proton and alpha-particle measurement'. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 483 (3) Article number PII S0168-9002(01)01952-0 , pp. 758-763.
  • Regan PH, Xu FR, Walker PM, Oi M, Rath AK, Stevenson PD. (2002) 'Structure of the doubly midshell nucleus Dy-170(66)104'. PHYSICAL REVIEW C, 65 (3) Article number ARTN 037302
  • O'Leary CD, Bentley MA, Lenzi SM, Martinez-Pinedo G, Warner DD, Bruce AM, Cameron JA, Carpenter MP, Davids CN, Fallon P, Frankland L, Gelletly W, Janssens RVF, Joss DT, Lister CJ, Regan PH, Reiter P, Rubio B, Seweryniak D, Svensson CE, Vincent SM, Williams SJ. (2002) 'Isovector pairing in odd-odd N=Z Mn-50'. PHYSICS LETTERS B, 525 (1-2), pp. 49-55.
  • Balabanski DL, Bingham C, Grzywacz R, Borcea C, Macovei I, Stanoiu M, Daugas JM, Defrance G, De Oliveira Santos F, Lewitowicz M, Smirnova NA, Neyens G, Goldring G, Hass M, Górska M, Grawe H, Mach H, Penionzkevich YE, Sobolev YG, Podolyák Z, Regan PH, Georgiev G, Coulier N, Coussement R, O'Leary C, Page R, Pfützner M, Rykaczewski K, Sawicka M, Teughels S, Vyvey K. (2001) 'Measurement of the g factors of isomers near the proposed N ≈ 40 subshell closure'. Physics of Atomic Nuclei, 64 (7), pp. 1181-1185.

    Abstract

    We report results from a pioneering experiment to measure the g factors of isomeric states of neutron-rich nuclei around Ni, far from the valley of β stability. For the first time, the time-dependent perturbed angular distribution method was applied in combination with the heavy-ion-γ correlation technique to study g factors of spin-aligned isomers produced in a projectile fragmentation reaction and mass-separated. Some technical aspects are discussed and illustrated with preliminary results. © 2001 MAIK "Nauka/Interperiodica".

  • Mineva AN, Hellstrom M, Bernas M, Gerl J, Grawe H, Pfutzner M, Regan PH, Rejmund M, Rudolph D, Becker F, Bingham CR, Enqvist T, Fogelberg B, Gausemel H, Geissel H, Genevey J, Gorska M, Grzywacz R, Hauschild K, Janas Z, Kojouharov I, Kopatch Y, Korgul A, Korten W, Kurcewicz J, Lewitowicz M, Lucas R, Mach H, Mandal S, Mayet P, Mazzocchi C, Pinston JA, Podolyak Z, Schaffner H, Schlegel C, Schmidt K, Summerer K, Wollersheim HJ. (2001) 'A new mu s isomer in Sb-136 produced in the projectile fission of U-238'. EUROPEAN PHYSICAL JOURNAL A, 11 (1), pp. 9-13.
  • Pearson CJ, Regan PH, Divoli A. (2001) 'The application of CdZnTe detectors for coincident alpha-gamma spectroscopy'. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 462 (3), pp. 393-396.
  • Narro JG, Longour C, Regan PH, Blank B, Pearson CJ, Lewitowicz M, Miehe C, Gelletly W, Appelbe D, Axelsson L, Bruce AM, Catford WN, Chandler C, Clark RM, Cullen DM, Czajkowski S, Daugas JM, Dessagne P, Fleury A, Frankland L, Giovinazzo J, Greenhalg B, Grzywacz R, Harder M, Jones KL, Kelsall N, Kszczot T, Page RD, Reed AT, Sorlin O, Wadsworth R. (2001) 'Fermi superallowed beta(+) decays and T=1 ground states of heavy odd-odd N=Z nuclei'. PHYSICAL REVIEW C, 63 (4) Article number ARTN 044307
  • Mineva MN, Hellström M, Rudolph D, Gerl J, Grawe H, Geissel H, Górska M, Kojouharov I, Kopatch Y, Mandal S, Mayet P, Mazzocchi C, Schaffner H, Schlegel C, Schmidt K, Sümmerer K, Wollersheim HJ, Bernas M, Regan PH, Podolyàk Z, Rejmund M, Becker F, Hauschild K, Korten W, Lucas R, Bingham CR, Grzywacz R, Enqvist T, Fogelberg B, Mach H, Gausemel H, Genevey J, Pinston JA, Lewitowicz M, Pfützner M, Janas Z, Korgul A, Kurcewicz J. (2001) 'A new μs isomer in Sb produced in the projectile fission of U'. European Physical Journal A, 11 (1), pp. 9-13.

    Abstract

    The neutron-rich isotope Sb has been produced following the relativistic projectile fission of U in an experiment performed at the Fragment Separator at GSI, Darmstadt. Delayed γ-ray spectroscopy of the fission products has been performed after isotope separation. A new isomeric state in Sb has been populated, and its lifetime measured as T = 565(50) ns. Realistic and empirical shell-model calculations have been performed and are compared to the experimental observables.

  • Wheldon C, Narro JG, Pearson CJ, Regan PH, Podolyak Z, Warner DD, Fallon P, Macchiavelli AO, Cromaz M. (2001) 'Yrast states in Os-194: The prolate-oblate transition region'. PHYSICAL REVIEW C, 63 (1) Article number ARTN 011304
  • Caamãno M, Walker PM, Pearson CJ, Mayet P, Hellström M, Regan PH, Podolyak ZS, Schlegel C, Pfützner M, Gerl J, Mlneva M. (2001) 'Isomeric decays inPt'. Acta Physica Polonica B, 32 (3), pp. 763-766.

    Abstract

    A projectile fragmentation experiment has been performed to populate the neutron-rich A ∼ 190 mass region, approaching the Z = 82, N = 126 closed shell. A previously unreported isomer is found in Pt, being the first new example, from fragmentation reactions, of a seniority 4 state established from γ-γ coincidences.

  • Bentley MA, Williams SJ, Joss DT, O'Leary CD, Bruce AM, Cameron JA, Carpenter MP, Fallon P, Frankland L, Gelletly W, Lister CJ, Martinez-Pinedo G, Poves A, Regan PH, Reiter P, Rubio B, Solano JS, Seweryniak D, Svensson CE, Vincent SM, Warner DD. (2000) 'Mirror symmetry at high spin in Fe-51 and Mn-51'. PHYSICAL REVIEW C, 62 (5) Article number ARTN 051303
  • Podolyak Z, Regan PH, Pfutzner M, Gerl J, Hellstrom M, Caamano M, Mayet P, Schlegel C, Aprahamian A, Benlliure J, Bruce AM, Butler PA, Gil DC, Cullen DM, Doring J, Enqvist T, Rejmund F, Fox C, Narro JG, Geissel H, Gelletly W, Giovinazzo J, Gorska M, Grawe H, Grzywacz R, Kleinbohl A, Korten W, Lewitowicz M, Lucas R, Mach H, Mineva M, O'Leary CD, De Oliveira F, Pearson CJ, Rejmund M, Sawicka M, Schaffner H, Schmidt K, Theisen C, Walker PM, Warner DD, Wheldon C, Wollersheim HJ, Wooding SC, Xu FR. (2000) 'Isomer spectroscopy of neutron rich W-190(116)'. PHYSICS LETTERS B, 491 (3-4), pp. 225-231.
  • Saitoh TR, Saitoh-Hashimoto N, Sletten G, Bark RA, Bergström M, Törmänen S, Varmette PG, Regan P, Walker PM, Wheldon C. (2000) 'Erratum to "collective and intrinsic structures in W" [nucl. Phys. A 660 (1999) 171-196] *'. Nuclear Physics A, 669 (3-4), pp. 381-406.

    Abstract

    The structure of W has been studied by employing the Yb(C,α 3n) reaction at 68 MeV. Five previously known rotational structure with one-quasiparticle configurations have been extended to higher spin states, and five new rotational bands with three- and five-quasiparticle configurations and a γ-vibration of a one-quasiparticle structure have been newly identified. In the ν7/2[503] and ν11/2[615] rotational structures, a signal of an admixture of an octupole- vibrational structure has been observed in their in-band B(M1)/B(E2) ratios and g factors. In the Κ = 19 rotational band, a Coriolis effect on the ν1/2[510] neutron has been identified. In all, 17 Κ-forbidden transitions have been observed. Energies of intrinsic states below 4 MeV have been calculated based on the Blocked BCS theory, and they are used in support of the configuration assignments. © 2000 Elsevier Science B.V. All rights reserved. PACS: 21.10.Re; 21.10.Tg; 23.20.En; 23.20.Lv; 27.70.+q.

  • Saitoh TR, Saitoh-Hashimoto N, Sletten G, Bark RA, Bergstrom M, Regan P, Tormanen S, Varmette PG, Walker PM, Wheldon C. (2000) 'Collective and intrinsic structures in W-183 (vol 660, pg 171, 1999)'. NUCLEAR PHYSICS A, 669 (3-4), pp. 381-406.
  • Dasgupta M, Dracoulis GD, Walker PM, Byrne AP, Kibédi T, Kondev FG, Lane GJ, Regan PH. (2000) 'Competition between high-K states and rotational structures in Ta'. Physical Review C - Nuclear Physics, 61 (4), pp. 443211-4432133.

    Abstract

    High-spin states in Ta have been studied using the Er(B,4n) reaction. New intrinsic states have been observed corresponding to 3-, 5-, and 7-quasiparticle high-K structures. Rotational bands built on most of the 3-and 5-quasiparticle states and some transitions above the 7-quasiparticle states have been identified. Several isomers have been found, the longest lived being the 49/2, 7-quasiparticle state with a meanlife of 192 μs. Configurations for the observed intrinsic states have been assigned on the basis of g values, alignments, and decay properties. While the properties of most of the bands are consistent with their proposed configurations, the behavior of some, including the one built on K = 21/2 3-quasiparticle isomer, is not well understood. Multiquasiparticle blocking calculations based on the Lipkin-Nogami method, are in good agreement with the excitation energies of the experimentally observed states and all the predicted states close to the yrast line up to spin 49/2 have been observed experimentally. The calculations predict the existence of a 9-quasiparticle 67/2 yrast trap at ∼ 8.5 MeV.

  • Chandler C, Regan PH, Blank B, Pearson CJ, Bruce AM, Catford WN, Curtis N, Czajkowski S, Dessagne P, Fleury A, Gelletly W, Giovinazzo J, Grzywacz R, Janas Z, Lewitowicz M, Marchand C, Miehe C, Orr NA, Page RD, Pravikoff MS, Reed AT, Saint-Laurent MG, Vincent SM, Wadsworth R, Warner DD, Winfield JS, Xu F. (2000) 'Observation of isomeric states in neutron deficient A similar to 80 nuclei following the projectile fragmentation of Mo-92'. PHYSICAL REVIEW C, 61 (4) Article number ARTN 044309
  • Regan PH. (2000) 'New tools for exotic discrete line gamma-ray spectroscopy.'. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 219, pp. U81-U81.
  • Daugas JM, Grzywacz R, Lewitowicz M, Achouri L, Angelique JC, Baiborodin D, Bennaceur K, Bentida R, Beraud R, Borcea C, Bingham C, Catford WN, Emsallem A, de France G, Grawe H, Jones KL, Lemmon RC, Jimenez MJL, Nowacki F, Santos FD, Pfutzner M, Regan PH, Rykaczewski K, Sauvestre JE, Sawicka M, Sletten G, Stanoiu M. (2000) 'The 8(+) isomer in Zn-78 and the doubly magic character of Ni-78'. PHYSICS LETTERS B, 476 (3-4), pp. 213-218.
  • Lazarus IH, Appelbe DE, Coleman-Smith PJ, Letts SC, Pucknell VFE, Simpson J, Butler PA, Cresswell JR, Herzberg RD, Hibbert I, Page RD, Sampson J, Thornhill J, Freeman SJ, Joss DT, Regan PH, Wadsworth R. (2000) 'The GREAT triggerless total data readout method'. IEEE Nuclear Science Symposium and Medical Imaging Conference, 2

    Abstract

    Recoil Decay Tagging (RDT) is a very powerful method for the spectroscopy of exotic nuclei. RDT is a delayed coincidence technique between detectors usually at the target position and at the focal plane of a spectrometer. Such measurements are often limited by dead time. This paper describes a novel triggerless data acquisition method which is being developed for the Gamma Recoil Electron Alpha Tagging (GREAT) spectrometer that overcomes this limitation by virtually eliminating dead time. Our solution is a Total Data Readout (TDR) method where all channels run independently and are associated in software to reconstruct events. The TDR method allows all the data from both target position and focal plane to be collected with practically no dead time losses. Each data word is associated with a timestamp generated from a global 100MHz clock. Events are then reconstructed in real time in the event builder using temporal and spatial associations defined by the physics of the experiment.

  • Regan P, Blank B. (2000) 'Exploring nuclear frontiers'. PHYSICS WORLD, 13 (1), pp. 29-34.
  • Vincent SM, Regan PH, Mohammadi S, Blumenthal D, Carpenter M, Davids CN, Gelletly W, Ghugre SS, Henderson DJ, Janssens RVF, Hjorth-Jensen M, Kharraja B, Lister CJ, Pearson CJ, Seweryniak D, Schwartz J, Simpson J, Warner DD. (1999) 'Near yrast study of the fpg shell nuclei Ni-58, Cu-61, and Zn-61'. PHYSICAL REVIEW C, 60 (6) Article number ARTN 064308
  • Saitoh TR, Saitoh-Hashimoto N, Sletten G, Bark RA, Bergstrom M, Regan P, Tormanen S, Varmette PG, Walker PM. (1999) 'Collective and intrinsic structures in W-183'. NUCLEAR PHYSICS A, 660 (2), pp. 171-196.
  • Parry CM, Hibbert IM, Wadsworth R, Wilson AN, Paul ES, Galindo-Uribarri A, Janzen VP, Ward D, Mullins SM, Regan PH, Svensson CE, Wyss R. (1999) 'Evidence for highly deformed bands in Sm-133(62)71'. PHYSICAL REVIEW C, 60 (5) Article number ARTN 054314
  • Reed AT, Tarasov O, Page RD, Guillemaud-Mueller D, Penionzhkevich YE, Allatt RG, Angelique JC, Anne R, Borcea C, Burjan V, Catford WN, Dlouhy Z, Donzaud C, Grevy S, Lewitowicz M, Lukyanov SM, Marques FM, Martinez G, Mueller AC, Nolan PJ, Novak J, Orr NA, Pougheon F, Regan PH, Saint-Laurent MG, Siiskonen T, Sokol E, Sorlin O, Suhonen J, Trinder W, Vincent SM. (1999) 'Radioactivity of neutron-rich oxygen, fluorine, and neon isotopes'. PHYSICAL REVIEW C, 60 (2) Article number ARTN 024311
  • Lewitowicz M, Daugas JM, Grzywacz R, Baiborodin D, Borcea C, De France G, De Oliveira-Santos F, Saint-Laurent MG, Stanoiu M, Trinder W, Winfield J, Glogowski M, Nowak A, Płochocki A, Pfützner M, Rykaczewski K, Sawicka M, Szerypo J, Bingham C, Achouri L, Angélique JC, Bentida R, Béraud R, Emsallem A, Houry M, Hurskanen S, Viteritti S, Catford W, Lemmon RC, Regan PH, Grawe H, Guillemaud-Mueller D, Mueller AC, Sorlin O, Jones KL, Sauvestre JE, Schaefer M, Sletten G. (1999) 'Study of μs-isomers in neutron-rich nuclei around Z=28 and N=40 shell closures'. Nuclear Physics A, 654 (1 SUPPL. 1)
  • Wheldon C, Walker PM, Regan PH, Saitoh T, Hashimoto N, Sletten G, Xu FR. (1999) 'High-K structures and triaxiality in Os-186'. NUCLEAR PHYSICS A, 652 (2), pp. 103-131.
  • Wheldon C, Walker PM, Regan PH, Saitoh T, Hashimoto N, Sletten G, Xu FR. (1999) 'Triaxial nuclear shapes at high angular momentum'. PHYSICAL REVIEW C, 59 (5), pp. R2334-R2338.
  • Becker F, Korten W, Hannachi F, Paris P, Buforn N, Chandler C, Houry M, Hubel H, Jansen A, Le Coz Y, Liang CF, Lopez-Martens A, Lucas R, Mergel E, Regan PH, Schonwasser G, Theisen C. (1999) 'Investigation of prolate-oblate shape-coexistence in Kr-74'. EUROPEAN PHYSICAL JOURNAL A, 4 (2), pp. 103-105.
  • Janas Z, Chandler C, Blank B, Regan PH, Bruce AM, Catford WN, Curtis N, Czajkowski S, Dessagne P, Fleury A, Gelletly W, Giovinazzo J, Grzywacz R, Lewitowicz M, Longour C, Marchand C, Miehe C, Orr NA, Page RD, Pearson CJ, Pravikoff MS, Reed AT, Saint-Laurent MG, Sheikh JA, Vincent SM, Wadsworth R, Warner DD, Winfield JS. (1999) 'Observation of the Z=N+1 nuclei Y-77(39), Zr-79(40), and Mo-83(42)'. PHYSICAL REVIEW LETTERS, 82 (2), pp. 295-298.
  • Janas Z, Blank B, Czajkowski S, Fleury A, Marchand C, Pravikoff MS, Grzywacz R, Chandler C, Regan PH, Catford WN, Curtis N, Gelletly W, Pearson CJ, Sheikh JA, Vincent SM, Bruce AM, Dessagne P, Giovinazzo J, Longour C, Miehé C, Lewitowicz M, Saint-Laurent MG, Winfield JS, Orr NA, Page RD, Reed AT, Wadsworth R, Warner DD. (1999) 'Observation of the Z = N + 1 Nuclei Y, Zr, and Mo'. Physical Review Letters, 82 (2), pp. 295-298.

    Abstract

    The very neutron deficient Z = N + 1 nuelei Y, Zr, and Mo have been observed for the first time following the fragmentation of a Mo beam. In contrast, no evidence was found for the existence of Nb and Tc. The observation of Y is of particular interest in light of the instability of the odd-proton, Z = N + 1 systems, Br, Rb, Nb, and Tc, and may be explained as a consequence of the shape polarizing effect of the highly deformed, prolate Z = N = 38 core. The experimental results are discussed within the framework of the shell-correction model, which together with proton-decay calculations allow an estimate of the proton separation energies of these highly exotic systems to be calculated.

  • Pfutzner M, Armbruster P, Baumann T, Benlliure J, Bernas M, Catford WN, Cortina-Gil D, Daugas JM, Geissel H, Gorska M, Grawe H, Grzywacz R, Hellstrom M, Iwasa N, Janas Z, Junghans AR, Karny M, Leenhardt S, Lewitowicz M, Mueller AC, de Oliviera F, Regan PH, Rejmund M, Rykaczewski K, Summerer K. (1998) 'New isotopes and isomers produced by the fragmentation of U-238 at 1000 MeV/nucleon'. PHYSICS LETTERS B, 444 (1-2), pp. 32-37.
  • Baxter AM, Byrne AP, Dracoulis GD, Davidson PM, McGoram TR, Regan PH, Chandler C, Gelletly W, Wheldon C, Julin R, Cocks JFC, Helariutta K, Jones P, Juutinen S, Kankaanpaa H, Kettunen H, Kuusiniemi P, Leino M, Muikku M, Savelius A, Janssens RVF, Brown T, Carpenter MP, Davids CN, Lauritsen T, Nisius D, Greenlees PT. (1998) 'Identification of yrast states in Pb-187'. PHYSICAL REVIEW C, 58 (5), pp. 2671-2676.
  • Longour C, Narro JG, Blank B, Lewitowicz M, Miehe C, Regan PH, Applebe D, Axelsson L, Bruce AM, Catford WN, Chandler C, Clark RM, Cullen DM, Czajkowski S, Daugas JM, Dessagne P, Fleury A, Frankland L, Gelletly W, Giovinazzo J, Greenhalgh B, Grzywacz R, Harder M, Jones KL, Kelsall N, Kszczot T, Page RD, Pearson CJ, Reed AT, Sorlin O, Wadsworth R. (1998) 'Observation of Fermi superallowed beta(+) decays in heavy odd-odd, N = Z nuclei: Evidence for 0(+) ground states in Y-78, Nb-82, and Tc-86'. PHYSICAL REVIEW LETTERS, 81 (16), pp. 3337-3340.
  • Vincent SM, Regan PH, Warner DD, Bark RA, Blumenthal D, Carpenter MP, Davids CN, Gelletly W, Janssens RVF, O'Leary CD, Lister CJ, Simpson J, Seweryniak D, Saitoh T, Schwartz J, Tormanen S, Juillet O, Nowacki F, Van Isacker P. (1998) 'Competing T=0 and T=1 structures in the N=Z nucleus Ga-62(31)'. PHYSICS LETTERS B, 437 (3-4), pp. 264-272.
  • Parry CM, Boston AJ, Chandler C, Galindo-Uribarri A, Hibbert IM, Janzen VP, Joss DT, Mullins SM, Nolan PJ, Paul ES, Regan PH, Vincent SM, Wadsworth R, Ward D, Wyss R. (1998) 'Yrast structures in the neutron-deficient Pr-127(59)68 and Pm-131(61)70 nuclei'. PHYSICAL REVIEW C, 57 (5), pp. 2215-2221.
  • Parry CM, Hibbert IM, Wadsworth R, Boston AJ, Joss DT, Nolan PJ, Paul ES, Chandler C, Regan PH, Vincent SM, Galindo-Uribarri A, Janzen VP, Ward D, Mullins SM, Wyss R. (1998) 'Yrast structures in the neutron-deficient Pr and Pm nuclei'. Physical Review C - Nuclear Physics, 57 (5), pp. 2215-2221.

    Abstract

    The odd-proton nuclei Pr and Pm have been investigated using the Ru(Cl,2p2n) and Ru(Ca,αp)/Ru(K,2p2n) reactions, respectively, at beam energies of 164, 180, and 186 MeV. States belonging to the yrast bands of Pr and Pm, which are interpreted as being based upon the h [541]3/2 proton configuration, have been observed from the 11/2 band head to spin 47/2. The properties of these two new structures are observed to be different to those of similar configurations in the heavier odd mass isotopes. The systematics of the band crossings in the πh bands of the odd mass Pr and Pm isotopes are discussed and compared with extended total Routhian surface calculations.

  • Purry CS, Walker PM, Dracoulis GD, Kibedi T, Kondev FG, Bayer S, Bruce AM, Byrne AP, Gelletly W, Regan PH, Thwaites C, Burglin O, Rowley N. (1998) 'Multi-quasiparticle isomers and rotational bands in W-178'. NUCLEAR PHYSICS A, 632 (2), pp. 229-274.
  • Chandler C, Regan PH, Pearson CJ, Blank B, Bruce AM, Catford WN, Curtis N, Czajkowski S, Gelletly W, Grzywacz R, Janas Z, Lewitowicz M, Marchand C, Orr NA, Page RD, Petrovici A, Reed AT, Saint-Laurent MG, Vincent SM, Wadsworth R, Warner DD, Winfield JS. (1997) 'Evidence for a highly deformed oblate 0(+) state in Kr-74(36)'. PHYSICAL REVIEW C, 56 (6), pp. R2924-R2928.
  • Walker PM, Cullen DM, Purry CS, Appelbe DE, Byrne AP, Dracoulis GD, Kibedi T, Kondev FG, Lee LY, Macchiavelli AO, Reed AT, Regan PH, Xu F. (1997) 'K-forbidden transitions from multi-quasiparticle states'. PHYSICS LETTERS B, 408 (1-4), pp. 42-46.
  • Regan PH, Menezes TM, Pearson CJ, Gelletly W, Purry CS, Walker PM, Juutinen S, Julin R, Helariutta K, Savelius A, Jones P, Jamsen P, Muikku M, Butler PA, Jones G, Greenlees P. (1997) 'Observation of (h(11/2))(2) neutron alignments in Mo-100, Ru-104, and Pd-108 using deep inelastic reactions'. PHYSICAL REVIEW C, 55 (5), pp. 2305-2313.
  • Bruce AM, Byrne AP, Dracoulis GD, Gelletly W, Kibedi T, Kondev FG, Purry CS, Regan PH, Thwaites C, Walker PM. (1997) 'Systematics of K-pi=8(-) isomers in N=74 nuclei'. PHYSICAL REVIEW C, 55 (2), pp. 620-624.
  • Regan PM, Chandler C, Pearson CJ, Catford WN, Curtis N, Gelletly W, Vincent SM, Blank B, Czajkowski S, Fleury A, Janas Z, Marchand C, Pravikoff MS, Grzywacz R, Lewitowicz M, Saint-Laurent MG, Winfield JS, Bruce AM, Dessagne P, Giovinazzo J, Longour C, Miehe C, Orr NA, Page RD, Reed AT, Wadsworth R, Warner DD. (1997) 'Studies of isomeric states and limits of particle stability around N∼Z∼40 using fragmentation reactions'. Acta Physica Polonica B, 28 (1-2), pp. 431-442.

    Abstract

    Fragmentation products from a Mo beam on a natural nickel target have been used to study structural properties of the very neutron deficient nuclei around N∼Z∼40. We present the first observation of isomeric decays in the T=1 systems Kr, Y and Nb. The isomer in Kr is interpreted as the hindered decay from an excited 0 state, confirming the prediction of prolate/oblate shape coexistence in this nucleus. Transitions from states below an isomer in the N=Z nucleus Tc have also been tentatively identified, making this the heaviest N=Z system for which decays from excited states have been observed. In addition, we have obtained the first conclusive evidence for the existence of the T = -1/2 isotopes Y, Zr and Mo. The data for Y is of particular interest in light of the reported instability in the lighter odd-Z, T = -1/2 systems Br and Rb.

  • Regan PH, Arrison JW, Huttmeier UJ, Balamuth DP. (1996) 'Yrast gamma-ray spectroscopy of the neutron rich isotopes Co-61,Co-63'. PHYSICAL REVIEW C, 54 (3), pp. 1084-1097.
  • Pohl KR, Regan PH, Bush JE, Raines PE, Balamuth DP, Ward D, Galindo-Uribarri A, Janzen VP, Mullins SM, Pilotte S. (1996) 'High-spin states in Pd, Pd, and Ag'. Physical Review C - Nuclear Physics, 53 (6), pp. 2682-2700.

    Abstract

    High-spin states in Pd and Ag have been studied by charged-particle-γ, γ-γ, and charged-particle-γ-γ coincidence measurements of heavy-ion fusion-evaporation reactions. The high-spin level schemes of these nuclides have been significantly extended and new deformed rotational bands have been found in each nuclide. These bands exhibit the general property of back bends corresponding to the rotational alignment of a pair of h quasineutrons. Band properties are compared with predictions of the cranked shell model and total Routhian surface calculations. The properties of the yrast and near-yrast bands of all three nuclides are generally consistent with predictions of moderate (β = 0.2) prolate deformation.

  • Curtis N, Murphy AS, Clarke NM, Freer M, Fulton BR, Hall SJ, Leddy MJ, Pople JS, Tungate G, Ward RP, Catford WN, Gyapong GJ, Singer SM, Chappell SPG, Fox SP, Jones CD, Watson DL, Rae WDM, Simmons PM, Regan PH. (1996) 'Evidence for a highly deformed band in O-16+O-16 breakup of S-32'. PHYSICAL REVIEW C, 53 (4), pp. 1804-1810.
  • Catford WN, Mohammadi S, Regan PH, Purry CS, Gelletly W, Walker PM, Gyapong GJ, Simpson J, Warner DD, Davinson T, Neal R, Page RD, Shotter AC, Hibbert IM, Wadsworth R, Forbes SA, Bruce AM, Thwaites C, Thirolf P, VanDuppen P, Galster W, Ninane A, Vervier J, Decrock P, Huyse M, Szerypo J, Wauters J. (1996) 'High resolution gamma-ray spectroscopy with a radioactive beam'. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 371 (3), pp. 449-459.
  • REGAN PH, STUCHBERY AE, ANDERSSEN SS. (1995) 'MEASUREMENT OF THE G-FACTOR OF THE YRAST-10(+)-STATE IN CD-11O'. NUCLEAR PHYSICS A, 591 (3), pp. 533-547.
  • PURRY CS, WALKER PM, DRACOULIS GD, KIBEDI T, BAYER S, BRUCE AM, BYRNE AP, DASGUPTA M, GELLETLY W, KONDEV F, REGAN PH, THWAITES C. (1995) 'ROTATION OF AN 8-QUASI-PARTICLE ISOMER'. PHYSICAL REVIEW LETTERS, 75 (3), pp. 406-409.
  • SIMMONS PM, RAE WDM, CHAPPELL SPG, FOX SP, JONES CD, WATSON DL, FREER M, FULTON BR, CLARKE NM, CURTIS N, LEDDY MJ, POPLE JS, HALL SJ, WARD RP, TUNGATE G, CATFORD WN, GYAPONG GJ, SINGER SM, REGAN PH. (1995) 'SEARCH FOR A 7-ALPHA CHAIN STATE'. PHYSICAL REVIEW C, 51 (6), pp. 3500-3503.
  • REGAN PH, DRACOULIS GD, BYRNE AP, LANE GJ, KIBEDI T, WALKER PM, BRUCE AM. (1995) 'HIGH-K STRUCTURES IN SM-136'. PHYSICAL REVIEW C, 51 (4), pp. 1745-1753.
  • FREER M, CLARKE NM, CURTIS N, FULTON BR, HALL SJ, LEDDY MJ, POPLE JS, TUNGATE G, WARD RP, SIMMONS PM, RAE WDM, CHAPPELL SPG, FOX SP, JONES CD, WATSON DL, GYAPONG GJ, SINGER SM, CATFORD WN, REGAN PH. (1995) 'BE-8 AND ALPHA-DECAY OF O-16'. PHYSICAL REVIEW C, 51 (4), pp. 1682-1692.
  • CHAPPELL SPG, WATSON DL, FOX SP, JONES CD, RAE WDM, SIMMONS PM, FREER M, FULTON BR, CLARKE NM, CURTIS N, LEDDY MJ, POPLE JS, HALL SJ, WARD RP, TUNGATE G, CATFORD WN, GYAPONG GJ, SINGER SM, REGAN PH. (1995) 'C-12+C-12 6-ALPHA-CHAIN STATE RESONANCE'. PHYSICAL REVIEW C, 51 (2), pp. 695-700.
  • BRUCE AM, WALKER PM, REGAN PH, DRACOULIS GD, BYRNE AP, KIBEDI T, LANE GJ, YEUNG KC. (1994) 'A K-PI=8- ISOMER IN SM-136'. PHYSICAL REVIEW C, 50 (1), pp. 480-482.
  • DASGUPTA M, WALKER PM, DRACOULIS GD, BYRNE AP, REGAN PH, KIBEDI T, LANE GJ, YEUNG KC. (1994) 'YRAST ISOMERS, MULTI-QUASI-PARTICLE STATES AND BLOCKING IN TA-176 AND TA-177'. PHYSICS LETTERS B, 328 (1-2), pp. 16-21.
  • Walker PM, Yeung KC, Dracoulis GD, Regan PH, Lane GJ, Davidson PM, Stuchbery AE. (1993) 'Backbending in W: A t-band crossing'. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 309 (1-2), pp. 17-22.

    Abstract

    A Fermi-aligned (1) rotational band, with K≈8, has been observed in an even-even nucleus, W Its structure corresponds to a t-band in the tilted-cranking representation It crosses the ground-state band at I=16ℏ, giving rise to backbending in the yrast sequence Contrary to the usual interpretation, backbending in this case is not caused by the s-band Comparison is made with other possible t-band crossings in the A ≈ 180 region.

Conference papers

  • Cieplicka N, Fornal B, Maier KH, Szpak B, Broda R, Krolas W, Pawlat T, Wrzesinski J, Janssens RVF, Carpenter MP, Chiara CJ, Hoffman CR, Kondev FG, Lauritsen T, Zhu S, Podolyak Z, Bowry M, Bunce M, Gelletly W, Kempley R, Reed M, Regan P, Walker P, Wilson E, Deo AY, Dracoulis G, Lane G, Rodriguez-Triguero C. (2014) 'ANGULAR DISTRIBUTIONS OF gamma RAYS FROM Bi-210 PRODUCED IN Pb-208+Pb-208 DEEP-INELASTIC REACTIONS'. WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO ACTA PHYSICA POLONICA B, Piaski, POLAND: 33rd Mazurian Lakes Conference on Physics 45 (2), pp. 205-210.
  • Mason PJR, Podolyak Z, Arginean NM, Regan PH, Alexander T, Algora A, Alharbi T, Bowry M, Britton R, Bucurescu D, Bruce AM, Bunce M, Cata-Danil G, Cata-Danil I, Cooper N, Deleanu D, Delion D, Filipescu D, Gelletly W, Glodariu T, Gheorghe I, Ghita D, Ilie G, Ivanova D, Kisyov S, Lalkovski S, Lica R, Liddick SN, Marginean R, Mihai C, Mulholland K, Negret A, Nita CR, Rice S, Roberts OJ, Sava T, Smith JF, Soederstroem P-A, Stevenson PD, Stroe L, Toma S, Townsley C, Werner V, Wilson E, Wood RT, Zamfir NV, Zhekova M, Niksic T, Milin M, Vretenar D, Szilner S. (2012) 'Li-7-Induced Reactions for Fast-Timing With LaBr3:Ce Detectors'. AMER INST PHYSICS NUCLEAR STRUCTURE AND DYNAMICS '12, Opatija, CROATIA: 2nd International Conference on Nuclear Structure and Dynamics 1491, pp. 93-96.
  • Rice S, Valencia E, Algora A, Tain JL, Regan PH, Podolyak Z, Agramunt J, Gelletly W, Nichols AL, Freeman S, Andreyev A, Bruce A, Deacon A, Jenkins D, Joss D, MacGregor D, Regan P, Simpson J, Tungate G, Wadsworth R, Watts D. (2012) 'Decay Heat Measurements Using Total Absorption Gamma-ray Spectroscopy'. IOP PUBLISHING LTD RUTHERFORD CENTENNIAL CONFERENCE ON NUCLEAR PHYSICS, 2011, Univ Manchester, Manchester, ENGLAND: Rutherford Centennial Conference on Nuclear Physics 381
  • Mason PJR, Alharbi T, Regan PH, Marginean N, Podolyak Z, Alkhomashi N, Bender PC, Bowry M, Bostan M, Bucurescu D, Bruce AM, Cata-Danil G, Cata-Danil I, Chakrabarti R, Deleanu D, Detistov P, Erduran MN, Filipescu D, Garg U, Glodariu T, Ghita D, Ghugre SS, Kusoglu A, Marginean R, Mihai C, Nakhostin M, Negret A, Pascu S, Triguero CR, Sava T, Simpson EC, Sinha AK, Stroe L, Suliman G, Zamfir NV, Freeman S, Andreyev A, Bruce A, Deacon A, Jenkins D, Joss D, MacGregor D, Regan P, Simpson J, Tungate G, Wadsworth R, Watts D. (2012) 'Half-life of the I-pi=4(-) Intruder State in P-34 Using LaBr3:Ce Fast Timing'. IOP PUBLISHING LTD RUTHERFORD CENTENNIAL CONFERENCE ON NUCLEAR PHYSICS, 2011, Univ Manchester, Manchester, ENGLAND: Rutherford Centennial Conference on Nuclear Physics 381
  • Bunce M, Regan PH, Werner V, Anagnostatou V, Beausang CW, Bowry M, Casperson RJ, Chen D, Cooper N, Goddard P, Hughes RO, Ilie G, Mason PJR, Pauerstein B, Reed MW, Ross TJ, Freeman S, Andreyev A, Bruce A, Deacon A, Jenkins D, Joss D, MacGregor D, Regan P, Simpson J, Tungate G, Wadsworth R, Watts D. (2012) 'A shell model study of the high spin states of Y-88'. IOP PUBLISHING LTD RUTHERFORD CENTENNIAL CONFERENCE ON NUCLEAR PHYSICS, 2011, Univ Manchester, Manchester, ENGLAND: Rutherford Centennial Conference on Nuclear Physics 381
  • Alharbi T, Mason PJR, Regan PH, Marginean N, Podolyak Z, Algora A, Alazemi N, Bruce AM, Britton R, Bunce MR, Bucurescu D, Cooper N, Deleanu D, Filipescu D, Gelletly W, Ghita D, Glodariu T, Ilie G, Kisyov S, Lintott J, Lalkovski S, Liddick S, Mihai C, Mulholland K, Marginean R, Negret A, Nakhostin M, Roberts OJ, Rice S, Smith JF, Stroe L, Sava T, Townsley C, Wilson E, Werner V, Zhekova M, Zamfir NV, Freeman S, Andreyev A, Bruce A, Deacon A, Jenkins D, Joss D, MacGregor D, Regan P, Simpson J, Tungate G, Wadsworth R, Watts D. (2012) 'Electromagnetic Transition Rate Measurements in the N=80 Isotone, Ce-138'. IOP PUBLISHING LTD RUTHERFORD CENTENNIAL CONFERENCE ON NUCLEAR PHYSICS, 2011, Univ Manchester, Manchester, ENGLAND: Rutherford Centennial Conference on Nuclear Physics 381
  • Bowry M, Podolyak Z, Kurcewicz J, Pietri S, Bunce M, Regan PH, Farinon F, Geissel H, Nociforo C, Prochazka A, Weick H, Allegro P, Benlliure J, Benzoni G, Boutachkov P, Gerl J, Gorska M, Gottardo A, Gregor N, Janik R, Knoebel R, Kojouharov I, Kubo T, Litvinov YA, Merchan E, Mukha I, Naqvi F, Pfeiffer B, Pfuetzner M, Plass W, Pomorski M, Riese B, Ricciardi MV, Schmidt K-H, Schaffner H, Kurz N, Bacelar AMD, Bruce AM, Farrelly GF, Alkhomashi N, Al-Dahan N, Scheidenberger C, Sitar B, Spiller P, Stadlmann J, Strmen P, Sun B, Takeda H, Tanihata I, Terashima S, Dobon JJV, Winfield JS, Wollersheim H-J, Woods PJ, Niksic T, Milin M, Vretenar D, Szilner S. (2012) 'Half-life Measurements of Isomeric States Populated in Projectile Fragmentation'. AMER INST PHYSICS NUCLEAR STRUCTURE AND DYNAMICS '12, Opatija, CROATIA: 2nd International Conference on Nuclear Structure and Dynamics 1491, pp. 317-320.
  • Anagnostatou V, Regan PH, Bunce MR, McCarthy D, Werner V, Ahn T, Casperson RJ, Chevrier R, Cooper N, Heinz A, Ilie G, Smith MK, Williams E, Bettermann L, Radeck D, Beausang CW, Boniwell C, Pauerstein B. (2011) 'MEASUREMENTS OF PICOSECOND LIFETIMES IN THE TRANSITIONAL NUCLEUS Pd-100 USING THE RDDM IN INVERSE KINEMATICS'. WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO ACTA PHYSICA POLONICA B, Zakopane, POLAND: Conference on Nuclear Physics - Extremes of the Nuclear Landscape 42 (3-4), pp. 807-811.
  • Kempley RS, Podolyak Z, Bazzacco D, Gadea A, Farnea E, Valiente-Dobon JJ, Mengoni D, Recchia F, Sahin E, Gottardo A, Corradi L, Fioretto E, Szilner S, Anagnostatou V, Al-Dahan N, De Angelis G, Bellato M, Berti B, Bortolato D, Bowry M, Bunce M, Cocconi P, Colombo A, Dombradi Z, Fanin C, Gelletly W, Isocrate R, Ketenci S, Kondratyev N, Kuti I, Mason PJR, Michelagnoli C, Mijatovic T, Molini P, Montagnioli G, Montanari D, Nakhostin M, Napoli DR, Pellegrini D, Regan PH, Rampazzo G, Reiter P, Rosso D, Scarlassara F, Stefanini A, Singh P, Toniolo N, Ur CA. (2011) 'CROSS-COINCIDENCES IN THE Xe-136+Pb-208 DEEP-INELASTIC REACTION'. WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO ACTA PHYSICA POLONICA B, Zakopane, POLAND: Conference on Nuclear Physics - Extremes of the Nuclear Landscape 42 (3-4), pp. 717-720.
  • Nara Singh BS, Wadsworth R, Boutachkov P, Blazhev A, Liu Z, Grawe H, Brock TS, Braun N, Go M, Pietri S, Rudolph D, Domingo-Pardo C, Steer SJ, Atac A, Bettermann L, Cáceres L, Eppinger K, Engert T, Faestermann T, Farinon F, Finke F, Geibel K, Gerl J, Gernhäuser R, Goel N, Gottardo A, Grȩbosz J, Hinke C, Hoischen R, Llie G, Iwasaki H, Jolie J, Kaşkaş A, Kojouharov I, Krücken R, Kurz N, Merchánt E, Nociforo C, Nyberg J, Pfützner M, Prochazka A, Podolyák Z, Regan PH, Reiter P, Rinta-Antila S, Scholl C, Schaffner H, Söderström P-A, Warr N, Weick H, Wollersheim H-J, Woods PJ, Nowacki F, Sieja K. (2011) 'Exotic nuclear studies around and below A=100'. American Institute of Physics AIP Conference Proceedings, Bordeaux, France: THE 4TH INTERNATIONAL CONFERENCE ON PROTON EMITTING NUCLEI AND RELATED TOPICS 1409, pp. 19-24.

    Abstract

    A RISING experiment with an aim to study exotic Cd nuclei was carried out at GSI‐FRS facility. Some preliminary results from this experiment are presented here. In particular, the β decay of 96Cd to 96Ag revealed the existence of a high spin isomer predicted a few decades ago. In this context, the structures of both these nuclei are discussed. Shell model calculations using the Gross‐Frenkel interaction are used to interpret the results.

  • Gottardo A, Valiente-Dobón JJ, Benzoni G, Nicolini R, Núñez JA, Algora A, Al-Dahan N, Angelis GD, Ayyad Y, Alkhomashi N, Allegro PRP, Benlliure J, Boutachkov P, Bowry M, Bracco A, Bruce AM, Bunce M, Casarejos E, Cortes L, Crespi FCL, Camera F, Corsi A, Bacelar AMD, Deo A, Domingo-Pardo C, Doncel M, Dombradi Z, Engert T, Eppinger K, Farrelly GF, Farinon F, Gadea A, Geissel H, Gerl J, Goel N, Górska M, Grebosz J, Gregor E, Haberman T, Hoischen R, Janik R, Klupp S, Kojouharov I, Kurz N, Leoni S, Lunardi S, Mandal S, Menegazzo R, Mengoni D, Million B, Napoli DR, Naqvi F, Nociforo C, Pfützner M, Pietri S, Podolyak Z, Prochazka A, Prokopowicz W, Recchia F, Ribas RV, Reed MW, Regan PH, Rudolph D, Sahin E, Schaffner H, Sharma A, Sitar B, Siwal D, Steger K, Strmen P, Swan TPD, Szarka I, Walker PM, Wieland O, Weick H, Wollersheim H-J. (2011) 'Isomers in neutron-rich lead isotopes populated via the fragmentation of 238U at 1 GeV A'. Institute of Physics Journal of Physics: Conference Series: International Nuclear Physics Conference, Vancouver, Canada: INPC 2010 312 (Section 9)

    Abstract

    Neutron-rich nuclei beyond N = 126 in the lead region were populated by fragmenting a 238U beam at 1 GeV A on a Be target and then separated by the Fragment Separator (FRS) at GSI. Their isomeric decays were observed, enabling study of the shell structure of neutron-rich nuclei around the Z=82 shell closure. Some preliminary results are reported in this paper.

  • Santawamaitre T, Regan PH, Bradley DA, Matthews M, Malain D, Al-Sulaiti HA. (2010) 'An evaluation of the level of naturally occurring radioactive material in soil samples along the Chao Phraya river basin'. ELSEVIER SCIENCE BV NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, Melbourne, AUSTRALIA: 11th International Symposium on Radiation Physics 619 (1-3), pp. 453-456.
  • Al-Sulaiti L, Shipley D, Thomas R, Kacperek A, Regan P, Palmans H. (2010) 'Water equivalence of various materials for clinical proton dosimetry by experiment and Monte Carlo simulation'. ELSEVIER SCIENCE BV NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, Melbourne, AUSTRALIA: 11th International Symposium on Radiation Physics 619 (1-3), pp. 344-347.
  • Habib AS, Bradley DA, Regan PH, Shutt AL. (2010) 'The use of MCNP and gamma spectrometry in supporting the evaluation of NORM in Libyan oil pipeline scale'. ELSEVIER SCIENCE BV NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, Melbourne, AUSTRALIA: 11th International Symposium on Radiation Physics 619 (1-3), pp. 245-251.
  • Malain D, Regan PH, Bradley DA, Matthews M, Santawamaitre T, Al-Sulaiti HA. (2010) 'Measurements of NORM in beach sand samples along the Andaman coast of Thailand after the 2004 tsunami'. ELSEVIER SCIENCE BV NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, Melbourne, AUSTRALIA: 11th International Symposium on Radiation Physics 619 (1-3), pp. 441-445.
  • Al-Sulaiti H, Regan PH, Bradley DA, Malain D, Santawamaitre T, Habib A, Matthews M, Bukhari S, Al-Dosari M. (2010) 'A preliminary report on the determination of natural radioactivity levels of the State of Qatar using high-resolution gamma-ray spectrometry'. ELSEVIER SCIENCE BV NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, Melbourne, AUSTRALIA: 11th International Symposium on Radiation Physics 619 (1-3), pp. 427-431.
  • Blazhev A, Braun N, Jolie J, Bettermann L, Finke F, Geibel K, Ilie G, Iwasaki H, Reiter P, Scholl C, Warr N, Grawe H, Boutachkov P, Górska M, Pietri S, Domingo-Pardo C, Kojouharov I, Caceres L, Engert T, Farinon F, Gerl J, Goel N, Hoischen R, Kurz N, Nociforo C, Prochazka A, Schaffner H, Weick H, Wollersheim H-J, Nara Singh S, Brock T, Wadsworth R, Liu Z, Gottardo A, Woods P, Nowacki F, Grȩbosz J, Rudolph D, Steer S, Podolyák Z, Regan P, Ataç A, Eppinger K, Faestermann T, Hinke C, Krücken R, Merchan E, Nyberg J, Söderström P-A, Pfützner M, Rinta-Antila S. (2010) 'High-energy excited states in Cd'. Journal of Physics: Conference Series, 205

    Abstract

    In Cd a new high-energy isomeric γ-ray transition was identified, which confirms previous spin-parity assignments and enables for the first time the measurement of the E2 and E4 strength for the two decay branches of the isomer. Preliminary results on the Cd high-excitation level scheme are presented. A comparison to shell-model calculations as well as implications for the nuclear structure around Sn are discussed. © 2010 IOP Publishing Ltd.

  • Podolyak Z, Steer SJ, Pietri S, Gorska M, Regan PH, Rudolph D, Garnsworthy AB, Hoischen R, Gerl J, Wollersheim HJ, Grawe H, Maier KH, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Geissel H, Grebosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tashenov S, Heinz A, Kurtukian-Nieto T, Benzoni G, Pfuetzner M, Jungclaus A, Balabanski DL, Brandau C, Brown BA, Bruce AM, Catford WN, Cullen IJ, Dombradi Z, Estevez ME, Gelletly W, Ilie G, Jolie J, Jones GA, Kmiecik M, Kondev FG, Kruecken R, Lalkovski S, Liu Z, Maj A, Myalski S, Schwertel S, Shizuma T, Walker PM, Werner-Malento E, Wieland O. (2009) 'Structure of neutron-rich nuclei around the N=126 closed shell; the yrast structure of Au-205(126) up to spin-parity I-pi = (19/2(+))'. SPRINGER EUROPEAN PHYSICAL JOURNAL A, Ryn, POLAND: 5th International Conference on Exotic Nuclei and Atomic Masses (ENAM'08) 42 (3), pp. 489-493.
  • Gorska M, Grawe H, Caceres L, Algora A, Boehmer M, Boutachkov P, Eppinger K, Faestermann T, Fujita Y, Gadea A, Garnsworthy A, Gelletly W, Gerl J, Gernhaeuser R, Hinke C, Jungclaus A, Kojouharov I, Kruecken R, Maier L, Molina P, Pfuetzner M, Pietri S, Podolyak Z, Regan PH, Rubio B, Rudolph D, Wollersheim HJ. (2009) 'NUCLEAR STRUCTURE ADDRESSED AT GSI/RISING'. WORLD SCIENTIFIC PUBL CO PTE LTD INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS, Dolny, POLAND: 15th Workshop on Nuclear Physics 18 (4), pp. 759-766.
  • Alkhomashi N, Regan PH, Podoyak Z, Pietri SB, Garnsworthy AB, Steer SJ, Benlliure J, Caserejos E, Gorska M, Gerl J, Wollersheim HJ, Grebosz J, Kurz N, Kojouharov I, Schaffner H, Alcora A, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Caceres L, Doornenbal P, Bacelar AMD, Cullen IJ, Estevez ME, Farrelly G, Fujita Y, Gelletly W, Hoischen R, Kumar R, Lalkovski S, Liu Z, Mihai C, Molina F, Muecher D, Rubio B, Tamii A, Tashenov S, Valiente-Dobon JJ, Walker PM, Woods PJ. (2009) 'beta(-)-DELAYED AND ISOMER SPECTROSCOPY OF NEUTRON-RICH Ta AND W ISOTOPES'. WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO ACTA PHYSICA POLONICA B, Zakopane, POLAND: 43rd Zakopane Conference on Nuclear Physics 40 (3), pp. 875-878.
  • Myalski S, Maj A, Podolyak Z, Becker F, Bednarczyk P, Benzoni G, Blank B, Brandau C, Bruce AM, Caceres L, Camera F, Catford WN, Cullen IJ, Dombradi Z, Doornenbal P, Estevez E, Garnsworthy AB, Geissel H, Gelletly W, Gerl J, Corska M, Grawe H, Grebosz J, Heinz A, Hoischen R, Ilie G, Jones GA, Jungclaus A, Kelic A, Kmiecik M, Kojouharov I, Kondev FG, Kurtukian-Nieto T, Kurz N, Lalkovski S, Liu Z, Montes F, Pfuetzner M, Pietri S, Prokopowicz W, Regan PH, Rudolph D, Saito T, Schaffner H, Schwertel S, Shizuma T, Simon AJ, Steer SJ, Tashenov S, Walker PM, Werner-Malento E, Wieland O, Wollersheim HJ. (2009) 'ISOMERIC RATIOS FOR NUCLEI WITH Z=62-67 AND A=142-152 PRODUCED IN THE RELATIVISTIC FRAGMENTATION OF Pb-208'. WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO ACTA PHYSICA POLONICA B, Zakopane, POLAND: 43rd Zakopane Conference on Nuclear Physics 40 (3), pp. 879-883.
  • Bacelar AMD, Bruce AM, Podolyak Z, Lalkovski S, Pietri S, Al-Dahan N, Gorska M, Algora A, Alkhomashi N, Benlliure J, Boutachkov P, Bracco A, Calore E, Casarejos E, Cullen IJ, Deo AY, Detistov P, Dombradi Z, Domingo-Pardo C, Doncel M, Farinon F, Farrelly GF, Geissel H, Gelletly W, Gerl J, Goel N, Grebosz J, Hoischen R, Kojouharov I, Kurz N, Leoni S, Molina F, Morales AI, Montanari D, Musumarra A, Nicolini R, Napoli DR, Nociforo C, Prochazka A, Prokopowicz W, Regan PH, Rubio B, Rudolph D, Verma S, Steer SJ, Strmen P, Swan TPD, Szarka I, Valiente-Dobon JJ, Walker PM, Weick H, Wollersheim HJ. (2009) 'ANGULAR MOMENTUM POPULATION IN FRAGMENTATION REACTIONS'. POLISH ACAD SCIENCES INST PHYSICS ACTA PHYSICA POLONICA B, Zakopane, POLAND: 43rd Zakopane Conference on Nuclear Physics 40 (3), pp. 889-892.
  • Wadsworth R, Singh BSN, Steer AN, Jenkins DC, Bentley MA, Brock T, Davies P, Glover R, Pattabiraman NS, Scholey C, Grahn T, Greenlees PT, Jones P, Jakobsson U, Julin R, Juutinen S, Ketelhut S, Leino M, Nyman M, Perua P, Pakarinen J, Rahkila P, Ruotslainen P, Sorri J, Uusitalo J, Lister CJ, Butler PA, Dimmock M, Joss DT, Thomson J, Rinta-Antila S, Cederwall B, Hadinia B, Sandzelius M, Atac A, Betterman L, Blazhev A, Braun N, Finke F, Geibel K, Ilie G, Iwasaki H, Jolie J, Reiter P, Scholl C, Warr N, Boutachkov P, Caceres L, Domingo C, Engert T, Farinon F, Gerl J, Goel N, Gorska M, Grawe H, Kurz N, Kojuharov I, Pietri S, Nociforo C, Prochazka A, Wollersheim H-J, Eppinger K, Faestermann T, Hinke C, Hoischen R, Kruecken R, Gottardo A, Liu Z, Woods P, Grebosz J, Merchant E, Nyberg J, Soderstrom P-A, Podolyak Z, Regan P, Steer S, Pfutzner M, Rudolph D. (2009) 'THE NORTHWEST FRONTIER: SPECTROSCOPY OF N similar to Z NUCLEI BELOW MASS 100'. POLISH ACAD SCIENCES INST PHYSICS ACTA PHYSICA POLONICA B, Zakopane, POLAND: 43rd Zakopane Conference on Nuclear Physics 40 (3), pp. 611-620.
  • Farrelly GF, Podolyak Z, Steer SJ, Pietri S, Xu FR, Werner-Malento E, Shizuma T, Regan PH, Rudolph D, Garnsworthy AB, Hoischen R, Gorska M, Gerl J, Wollersheim HJ, Kurtukian-Nieto T, Benzoni G, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Geisserl H, Grebosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tashenov S, Heinz A, Pfuezner M, Jungclaus A, Balabanski DL, Brandau C, Bruce AM, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Gelletly W, Ilie G, Jolie J, Jones GA, Kmiecik M, Kondev FG, Kruecken R, Lalkovski S, Liu HL, Liu Z, Maj A, Myalski S, Schwerrel S, Walker PM, Wieland O. (2009) 'REVISION OF THE K-ISOMER IN W-190(116)'. WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO ACTA PHYSICA POLONICA B, Zakopane, POLAND: 43rd Zakopane Conference on Nuclear Physics 40 (3), pp. 885-888.
  • Morales AI, Benlliure J, Regan PH, Podolyak Z, Gorska M, Alkhomashi N, Pietri S, Kumar R, Casarejos E, Agramunt J, Algora A, Alvarez-Pol H, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Caceres LS, Cullen IJ, Bacelar AMD, Doornenbal P, Dragosavac D, Estevez ME, Farrelly G, Fujita Y, Garnsworthy AB, Gelletly W, Gerl J, Grebosz J, Hoischen R, Kojouharov I, Kurz N, Lalkovski S, Liu Z, Perez-Loureiro D, Prokopowicz W, Mihai C, Molina F, Muecher D, Rubio B, Schapffner H, Steer SJ, Tamii A, Tashenov S, Dobon JJV, Verma S, Walker PM, Wollersheim HJ, Woods PJ. (2009) 'beta-DELAYED gamma-RAY SPECTROSCOPY OF HEAVY NEUTRON RICH NUCLEI "SOUTH" OF LEAD'. POLISH ACAD SCIENCES INST PHYSICS ACTA PHYSICA POLONICA B, Zakopane, POLAND: 43rd Zakopane Conference on Nuclear Physics 40 (3), pp. 867-870.
  • Yoshinaga N, Higashiyama K, Regan PH. (2009) 'Shell model study of neutron rich Se and Ge isotopes'. AIP Conference Proceedings: 6th Japan‐Italy Symposium on Heavy‐Ion Physics, Tokai, Japan: Perspective in Nuclear Physics 1120, pp. 255-259.

    Abstract

    Nuclear structure of the neutron‐rich Se, and Ge isotopes is theoretically studied in terms of the spherical full shell model with the monopole and quadrupole pairing plus quadrupole‐quadrupole interaction. The experimental energy levels of low‐lying states as well as high‐spin states are well reproduced. The shell model results are examined in details in a pair‐truncated shell model. The analysis shows the alignment of two g9/2 neutrons at high spins.

  • Al-Dahan N, Podolyak Z, Regan PH, Steer SJ, Alkhomashi N, Bacelar AMD, Gorska M, Pietri SB, Gelletly W, Walker PM, Farrelly G, Morales AI, Deo AY, Cullen IJ, Gerl J, Domingo-Pardo C, Verma S, Swan T, Wollersheim HJ, Bruce AM, Lalkovski S, Benlliure J, Algora A, Boutachkov P, Bracco A, Calore E, Casarejos E, Detistov P, Dombradi Z, Doncel M, Farinon F, Geissel H, Goel N, Grebosz J, Hoischen R, Kojouharov I, Leoni S, Molina F, Montanari D, Musumarra A, Nicolini R, Napoli DR, Nociforo C, Rubio B, Prochazka A, Rudolph D, Strmen P, Szarka I, Valiente-Dobon JJ, Weick H, Blazhev A, Jolie J, Warr N, Zilges A. (2009) 'Structure of N >= 126 nuclei produced in fragmentation of (238)U'. AMER INST PHYSICS CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS, Univ Cologne, Inst Nucl Phys, Cologne, GERMANY: 13th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics 1090, pp. 145-148.
  • Regan PH, Alkhomashi N, Al-Dahan N, Podolyak Z, Suckling EB, Stevenson PD, Pietri SB, Steer SJ, Garnsworthy AB, Gelletly W, Benlliure J, Morales AI, Gerl J, Gorska M, Wollersheim HJ, Kumar R, Grebosz J, Algora A, Benzoni G, Boutachkov P, Bruce AM, Casarejos E, Cullen IJ, Bacelar AMD, Blazhev A, Estevez ME, Farrelly G, Fujita Y, Hoischen R, Lalkovski S, Liu Z, Kojouharov I, Kurz N, Mihai C, Molina F, Muecher D, Rubio B, Schaffner H, Tashenov S, Tamii A, Dobon JJV, Walker PM, Woods PJ, Blazhev A, Jolie J, Warr N, Zilges A. (2009) 'New Insights into the Structure of Exotic Nuclei Using the RISING Active Stopper'. AMER INST PHYSICS CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS, Univ Cologne, Inst Nucl Phys, Cologne, GERMANY: 13th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics 1090, pp. 122-129.
  • Podolyak Z, Steer SJ, Farrelly G, Gorska M, Grawe H, Maier HK, Regan PH, Benlliure J, Pietri S, Gerl J, Wollersheim HJ, Milin M, Niksic T, Vretenar D, Szilner S. (2009) 'Structure of Neutron-rich N=126 Closed Shell Nuclei'. AMER INST PHYSICS NUCLEAR STRUCTURE AND DYNAMICS '09, Dubrovnik, CROATIA: International Conference on Nuclear structure and Dynamics 1165, pp. 86-89.
  • Rudolph D, Pietri S, Podolyak Z, Regan PH, Garnsworthy AB, Hoischen R, Steer SJ, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Geissel H, Gerl J, Gorska M, Grebosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tashenov S, Werner-Malento E, Wollersheim HJ, Andersson L-L, Atanasova L, Balabanski DL, Bentley MA, Benzoni G, Blank B, Blazhev A, Brandau C, Brown JR, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Fahlander C, Gelletly W, Heinz A, Hellstrom M, Ilie G, Johansson EK, Jolie J, Jones GA, Jungclaus A, Kmiecik M, Kondev FG, Kurtukian-Nieto T, Lalkovski S, Liu Z, Maj A, Myalski S, Pfutzner M, Shizuma T, Simons AJ, Schwertel S, Walker PM, Wieland O. (2007) 'Exciting isomers from the first stopped-beam RISING campaign'. EDP SCIENCES S A EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS, Cortina, ITALY: 7th International Conference on Radioactive Nuclear Beams 150, pp. 173-176.
  • Benzoni G, Azaiez F, Leoni S, Battacharyya S, Borcea R, Bracco A, Corradi L, Curien D, De France G, Dombradi Z, Fioretto E, Franchoo S, Grevy S, Ibrahim F, Iulian S, Mukherjee G, Navin A, Pollarolo G, Redon N, Regan PH, Rejmund M, Schmitt C, Sletten G, Sohler D, Stanoiu M, Szilner S, Verney D. (2007) 'In-beam gamma spectroscopy using DIC with a radioactive Ne beam'. EDP SCIENCES S A EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS, Cortina, ITALY: 7th International Conference on Radioactive Nuclear Beams 150, pp. 83-86.
  • Pietri S, Regan PH, Podolyak Z, Rudolph D, Steer S, Garnsworthy AB, Werner-Malento E, Hoischen R, Gorska M, Gerl J, Wollersheim HJ, Kojouharov I, Schaffner H, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Geissel H, Grebosz J, Kelic A, Kurz N, Montes F, Prokopowicz W, Saito T, Tashenov S, Heinz A, Pfuetzner M, Kurtukian-Nieto T, Benzoni G, Hellstrom M, Jungclaus A, Simpson J, Andersson L-L, Atanasova L, Balabanski D, Bentley MA, Blank B, Blazhev A, Brandau C, Brown JR, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Fahlander C, Gelletly W, Ilie G, Johansson EK, Jolie J, Jones GA, Kmiecik M, Kondev FG, Lalkovski S, Liu Z, Maj A, Myalski S, Shizuma T, Simons AJ, Schwertel S, Walker PM, Wieland O. (2007) 'Recent results in fragmentation isomer spectroscopy with rising'. ELSEVIER SCIENCE BV NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, Ft Worth, TX: 19th International Conference on Application of Accelerators in Research and Industry 261 (1-2), pp. 1079-1083.
  • Pietri S, Regan PH, Podolyak Z, Rudolph D, Gorska M, Jungclaus A, Pfuetzner M, Garnsworthy AB, Steer SJ, Caceres L, Werner-Malento E, Hoischen R, Gerl J, Kojouharov I, Schaffner H, Wollersheim HJ, Becker F, Bednarczyk P, Doornenbal P, Geissel H, Grebosz J, Kelic A, Kurz N, Montes F, Prokopowicz W, Saito T, Tashenov S, Heinz A, Kurtukian-Nieto T, Benzoni G, Hellstrom M, Andersson L-L, Atanasova L, Balabanski DL, Bentley MA, Blank B, Blazhev A, Brandau C, Brown JR, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Fahlander C, Gelletly W, Ilie G, Johansson EK, Jolie J, Jones GA, Kmiecik M, Kondev FG, Lalkovski S, Liu Z, Maj A, Myalski S, Shizuma T, Simons AJ, Schwertel S, Walker PM, Wieland O. (2007) 'First results from the stopped beam isomer rising campaign at GSI'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, Zakopane, POLAND: 41st Zakopane Conference on Nuclear Physics 38 (4), pp. 1255-1264.
  • Thompson NJ, Regan PH, Garnsworth AB, Ayangeakaa AD, Ai HC, Amon L, Cakirli RB, Casten RF, Fitzpatrick CR, Freeman SJ, Gurdal G, Heinz A, Jones GA, McCutchan EA, Qian J, Werner V, Williams SJ, Winkler R. (2007) 'Spectroscopy of Zr-91(51) at medium to high spins'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, Zakopane, POLAND: 41st Zakopane Conference on Nuclear Physics 38 (4), pp. 1381-1384.
  • Caceres LS, Gorska M, Jungclaus A, Regan PH, Garnsworthy AB, Pietri S, Podolyak Z, Rudolph D, Steer SJ, Grawe H, Balabanski DL, Becker F, Bednarczyk P, Benzoni G, Blank B, Brandau C, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombradi Z, Doornenbalal P, Estevez E, Geissel H, Gelletly W, Gerl J, Grebosz J, Heinz A, Hoischen R, Ilie G, Jolie J, Jones GA, Kmiecik M, Kojouharov I, Kondev FG, Kurtukian-Nieto T, Kurz N, Lalkowski S, Liu L, Maj A, Myalsk S, Montes F, Pfuetzner M, Prokopowicz W, Saito T, Schatfner H, Schwertel S, Shizuma T, Simons AJ, Tashenov S, Walker PM, Werner-Malento E, Wielandh O, Wollersheim HJ. (2007) 'Identification of excited states in the N = Z nucleus Nb-82'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, Zakopane, POLAND: 41st Zakopane Conference on Nuclear Physics 38 (4), pp. 1271-1275.
  • Goerska M, Banu A, Bednarczyk P, Bracco A, Buerger A, Camera F, Caurier E, Doornenbal P, Gerl J, Grawe H, Honma M, Huebel H, Jungclaus A, Maj A, Neyens G, Nowacki F, Otsuka T, Pfutzner T, Pietri S, Podolyak Z, Poves A, Regan PH, Reiter P, Rudolph D, Wollersheim HJ. (2007) 'Nuclear structure far off stability - Rising campaigns'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, Zakopane, POLAND: 41st Zakopane Conference on Nuclear Physics 38 (4), pp. 1219-1228.
  • Steer SJ, Podolyak Z, Pietri S, Regan PH, Rudolph D, Werner-Malento E, Garnsworthy AB, Hoischen R, Gorska M, Gerl J, Wollersheim HJ, Becker F, Bednarczyk P, Caceres L, Doornenbal P, Geissel H, Grebosz J, Kelic A, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tachenov S, Heinz A, Pfuetzner M, Kurtukian-Nieto T, Benzoni G, Jungclaus A, Balabanski DL, Brandau C, Bruce AM, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Gelletly W, Ilie G, Jolie J, Jones GA, Kmiecik M, Kondev FG, Lalkovski S, Liu Z, Maj A, Myalski S, Shizuma T, Schwertel S, Walker PM, Wieland O. (2007) 'Identification of isomeric states 'south' of Pb-208 via projectile fragmentation'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, Zakopane, POLAND: 41st Zakopane Conference on Nuclear Physics 38 (4), pp. 1283-1286.
  • Garnsworthy AB, Regan PH, Pietri S, Rudolph D, Caceres L, Gorska M, Podolyak Z, Steer SJ, Heinz A, Becker F, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grawe H, Grebosz J, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopwicz W, Saito T, Schaffner H, Tachenov S, Werner-Malento E, Wollersheim HJ, Benzoni G, Blank B, Brandau C, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Gelletly W, Hoischen R, Ilie G, Jolie J, Jones GA, Jungclaus A, Kmiecik M, Kondev FG, Kurtukian-Nieto T, Lalkovski S, Liu Z, Maj A, Myalski S, Pfutzner M, Shizuma T, Simons AJ, Schwertel S, Walker PM, Wieland O. (2007) 'Isomeric states in the light Tc isotopes'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, Zakopane, POLAND: 41st Zakopane Conference on Nuclear Physics 38 (4), pp. 1265-1269.
  • Ashley SF, Linnemann A, Jolie J, Regan PH, Andgren K, Dewald A, McCutchan EA, Melon B, Moeller O, Zamfir NV, Amon L, Boelaert N, Cakirli RB, Casten RF, Clark RM, Fransen C, Gelletly W, Gurdal G, Heidemann M, Keyes KL, Erduran MN, Meyer DA, Papenberg A, Plettner C, Rainovski G, Ribas RV, Thomas NJ, Vinson J, Warner DD, Werner V, Williams E, Zell KO. (2007) 'Lifetime determination of excited states in Cd-106'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, Zakopane, POLAND: 41st Zakopane Conference on Nuclear Physics 38 (4), pp. 1385-1388.
  • Regan PH, Gamsworthy AB, Steer SJ, Pletri S, Podolyak Z, Rudolph D, Gorska M, Caceres L, Wemer-Malento E, Gerl J, Wollersheim HJ, Becker F, Bednarczyk P, Doornenbal PD, Geissel H, Grawe H, Grebosz J, Hoischen R, Kelic A, Kojouharov I, Kurz N, Montes F, Prokopowicz W, Saito T, Schaffner H, Tashenov S, Heinz A, Pfuetzner M, Kurtukian-Nieto T, Benzoni G, Hellstroem M, Jungclaus A, Andersson L-L, Atanasova L, Balabanski DL, Bentley MA, Blank B, Blazhev A, Brandau C, Brown J, Bruce AM, Camera F, Catford WN, Cullen IJ, Dombradi Z, Estevez E, Fahlander C, Gelletly W, Ilie G, Johansson EK, Jolie J, Jones GA, Kmiecik M, Kondev G, Lalkovski S, Liu Z, Maj A, Myalski S, Schwertel S, Shizuma T, Simons AJ, Walker PM, Wieland O, Cetin SA, Hikmet I. (2007) 'First results from the stopped RISING campaign at GSI: The mapping of isomeric decays in highly exotic nuclei'. AMER INST PHYSICS Six International Conference of the Balkan Physical Union, Istanbul, TURKEY: 6th International Conference of the Balkan-Physical-Union 899, pp. 19-22.
  • Mohammadi S, De Angelis G, Axiotis M, Bazzacco D, Bizzeti PG, Brandolini F, Broda R, Bucurescu D, Farnea E, Gelletly W, Gadea A, Ionescu-Bujor M, Iordachescu A, Kroll T, Longdown S, Lunardi S, Marginean N, Martinez T, Medina N, Podolyak Z, Quintana B, Regan PH, Rubio B, Ur CA, Dobon J-JV, Walker PM, Zhang YH. (2006) 'Yrast states in Os-188,Os-190 nuclei'. WORLD SCIENTIFIC PUBL CO PTE LTD INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS, Shanghai, PEOPLES R CHINA: International Conference on Frontiers of Nuclear Structure 15 (8), pp. 1797-1802.
  • Regan PH. (2006) 'Isomers and structural evolution using the RISING array'. AMER CHEMICAL SOC ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Atlanta, GA: 231st National Meeting of the American-Chemical-Society 231
  • Regan PH, Thompson NJ, Garnsworthy AB, Ai HC, Amon L, Cakirli RB, Casten RF, Fitzpatrick CR, Freeman SJ, Gurdal G, Heinz A, Jones GA, McCutchan EA, Qian J, Werner V, Williams SJ, Winkler R, Woehr A, Aprahamian A. (2006) 'Isomer and in-beam spectroscopy of medium-spin states in Zr-91,Zr-92'. AMER INST PHYSICS Capture Gamma-Ray Spectroscopy and Related Topics, Univ Notre Dame, Notre Dame, IN: 12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics 819, pp. 35-39.
  • Regan PH, Jones GA, Podolyak Z, de Angelis G, Zhang YH, Gadea A, Ur CA, Abdullah M, Axiotis M, Bazzacco D, Broda R, Bucurescu D, Farnea E, Gelletly W, Ionescu-Bujor M, Iordachescu A, Kroell T, Langdown SD, Lenzi S, Lunardi S, Marginean N, Martinez T, Medina N, Menegazzo R, Napoli DR, Quintana B, Rubio B, Rusu C, Schwenger R, Tonev D, Valiente-Dobon JJ, von Oertzen W, Wollel G, Corradi L, Fioretto E, Gadea A, Ackermann D, Haas F, Pollarolo G, Scarlassara F, Szilner S, Trotta M. (2006) 'Nuclear structure and reaction mechanism studies with multinucleon reactions'. AMER INST PHYSICS FUSION06: Reaction Mechanisms and Nuclear Structure at the Coulomb Barrier, Coulomb Barrier, Venice, ITALY: International Conference on Reaction Mechanisms and Nuclear Structure 853, pp. 271-276.
  • Regan PH, Jones GA, Podolyak Z, Yoshinaga N, Higashiyama K, de Angelis G, Zhang YH, Gadea A, Ur CA, Axiotis M, Bazzacco D, Broda R, Bucurescu D, Farnea E, Gelletly W, Ionescu-Bujor M, Iordachescu A, Kroll T, Langdown SD, Lenzi S, Lunardi S, Marginean N, Martinez T, Medina N, Menegazzo R, Napoli DR, Quintana B, Rubio B, Rusu C, Schwenger R, Tonev D, Valiente Dobon JJ, von Oertzen W, Woehr A, Aprahamian A. (2006) 'Multinucleon transfer reactions to study single-particle evolution in Se isotopes'. AMER INST PHYSICS Capture Gamma-Ray Spectroscopy and Related Topics, Univ Notre Dame, Notre Dame, IN: 12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics 819, pp. 464-471.
  • Jones GA, Walker PM, Podoydk Z, Regan PH, Williams SJ, Carpentert MP, Carroll JJ, Chakrawarthy RS, Chowdhury P, Cullen IJ, Dracoulis GD, Gamsworthy AB, Hackman G, Janssens RVF, Khoo TL, Kondev FG, Lane GJ, Liu Z, Seweryniak D, Thompson NJ, Zhu S, Corradi L, Fioretto E, Gadea A, Ackermann D, Haas F, Pollarolo G, Scarlassara F, Szilner S, Trotta M. (2006) 'Microsecond and nanosecond isomers populated in fission reactions'. AMER INST PHYSICS FUSION06: Reaction Mechanisms and Nuclear Structure at the Coulomb Barrier, Coulomb Barrier, Venice, ITALY: International Conference on Reaction Mechanisms and Nuclear Structure 853, pp. 342-349.
  • Garrett PE, Svensson CE, Andreoiu C, Bandyopadhyay D, Finlay P, Grinyer GF, Hyland B, Illes E, Phillips AA, Schumaker MA, Valiente-dobón JJ, Wong J, Ball GC, Hackman G, Andreyev A, Chan S, Coombes H, Churchman R, Chakrawarthy RS, Morton AC, Pearson CJ, Smith MB, Zganjar EF, Ashley SF, Jones GA, Regan PH, Walker PM, Williams SJ, Austin RAE, Becker JA, Kulp WD, Wood JL, Leslie JR, Mattoon C, Sarazin F, Ressler JJ, Schwarzenberg J, Waddington JC, Watters LM. (2006) 'Gamma-ray spectroscopy at TRIUMF-ISAC'. AIP Conference Proceedings, 819, pp. 249-253.

    Abstract

    The 8π spectrometer at TRIUMF-ISAC consists of 20 Compton-suppressed germanium detectors and various auxiliary devices. The Ge array, once used for studies of nuclei at high angular momentum, has been transformed into the world's most powerful device dedicated to radioactive-decay studies. Many improvements in the spectrometer have been made, including a high-throughput data acquisition system, installation of a moving tape collector, incorporation of an array of 20 plastic scintillators for β-particle tagging, 5 Si(Li) detectors for conversion electrons, and 10 BaF detectors for fast-lifetime measurements. Experiments can be performed where data from all detectors are collected simultaneously, resulting in a very detailed view of the nucleus through radioactive decay. A number of experimental programmes have been launched that take advantage of the versatility of the spectrometer, and the intense beams available at TRIUMF-ISAC. © 2006 American Institute of Physics.

  • Jones GA, Podolyak Z, Walker PM, Regan PH, de Angelis G, Axiotis M, Bazzacco D, Bizzeti PG, Brandolini F, Broda R, Bucurescu D, Farnea E, Gelletly W, Gadea A, Ionescu-Bujor M, Iordachescu A, Kroll T, Langdown SD, Lunardi S, Marginean N, Martinez T, Medina NH, Quintana B, Rubio B, Ur CA, Valiente-Dobon JJ, Williams SJ, Zhang YH. (2005) 'Population of yrast states in Os-191 using deep-inelastic reactions'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, Univ Surrey, Guildford, ENGLAND: 1st International Conference on Nuclear, Structure, Astrophysics and Reactions (NUSTAR 05) 31 (10), pp. S1891-S1894.
  • Williams SJ, Jenneson PM, Garrett PE, Regan PH, Andreoiu C, Ball GC, Chakrawarthy RS, Daoud JJ, Grinyer GF, Hackman G, Hyland B, Mlwilo NA, Morton AC, Pearson CJ, Ressler JJ, Schumaker MA, Smith MB, Svensson CE, Dobon JJV. (2005) 'Testing the integration of BaF2 detectors into the 8 pi array: fast-timing measurements at TRIUMF'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, Univ Surrey, Guildford, ENGLAND: 1st International Conference on Nuclear, Structure, Astrophysics and Reactions (NUSTAR 05) 31 (10), pp. S1979-S1984.
  • Andgren K, Ashley SF, Regan PH, McCutchan EA, Zamfir NV, Amon L, Cakirli RB, Casten RF, Clark RM, Gurdal G, Keyes KL, Meyer DA, Erduran MN, Papenberg A, Pietralla N, Plettner C, Rainovski G, Ribas RV, Thomas NJ, Vinson J, Warner DD, Werner V, Williams E. (2005) 'RDM lifetime measurements in Cd-107'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, Univ Surrey, Guildford, ENGLAND: 1st International Conference on Nuclear, Structure, Astrophysics and Reactions (NUSTAR 05) 31 (10), pp. S1563-S1568.
  • Ressler JJ, Beausang CW, Casten RF, Zamfir NV, Ai H, Amro H, Babilon M, Cakirli RB, Caggiano JA, Gurdal G, Heinz A, Hughes RO, Langdown SD, McCutchan EA, Meyer DA, Plettner C, Qian J, Regan PH, Sciacchitano MJS, Thomas NJ, Williams E, Yamamoto A. (2005) 'Isomers and seniority in the trans-Pb nuclei'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, Univ Surrey, Guildford, ENGLAND: 1st International Conference on Nuclear, Structure, Astrophysics and Reactions (NUSTAR 05) 31 (10), pp. S1605-S1610.
  • Jones GA, Podolyak Z, Schunck N, Walker PM, De Angelis G, Zhang YH, Axiotis M, Bazzacco D, Bizzeti PG, Brandolini F, Broda R, Bucurescu D, Farnea E, Gelletly W, Gadea A, Ionescu-Bujor M, Iordachescu A, Kroll T, Langdown SD, Lunardi S, Marginean N, Martinez T, Medina NH, Quintana B, Regan PH, Rubio B, Ur CA, Valiente-Dobon JJ, Williams SJ. (2005) 'Oblate collectivity in the yrast structure of Pt-194'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, Zakopane, POLAND: 39th Zakopane School of Physics International Symposium 36 (4), pp. 1323-1327.
  • Regan PH, Wheldon C, Yamamoto AD, Valiente-Dobon JJ, Cline D, Wu CY, Macchiavelli AO, Xu FR, Smith JF, Andgren K, Chakrawarthy RS, Cromaz M, Fallon P, Freeman SJ, Gorgen A, Hayes A, Hua H, Langdown SD, Lee IY, Pearson CJ, Podolyak Z, Teng R. (2005) 'Vibrational and rotational sequences in Mo-101 and Ru-103,Ru-4 studied via multinucleon transfer reactions'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, Zakopane, POLAND: 39th Zakopane School of Physics International Symposium 36 (4), pp. 1313-1322.
  • Smith MB, Walker PM, Chakrawarthy RS, Austin RAE, Ball GC, Carroll JJ, Cunningham E, Finlay P, Garrett PE, Grinyer GF, Hackman G, Hyland B, Koopmans K, Kulp WD, Leslie JR, Phillips AA, Propri R, Regan PH, Sarazin F, Schumaker MA, Scraggs HC, Shizuma T, Svensson CE, von Schwarzenberg J, Waddington JC, Ward D, Wood JL, Washbrook B, Zganjar EF. (2004) 'Studies of high-K isomers at TRIUMF-ISAC'. ELSEVIER SCIENCE BV NUCLEAR PHYSICS A, Argonne, IL: 6th International Conference on Radioactive Nuclear Beams 746, pp. 617C-620C.
  • Mohammadi S, Podolyak Z, de Angelis G, Axiotis M, Bazzacco D, Bizzeti PG, Brandolini F, Broda R, Bucurescu D, Farnea E, Gelletly W, Gadea A, Ionescu-Bujor M, Iordachescu A, Kroll T, Longdown S, Lunardi S, Marginean N, Martinez T, Medina NH, Quintana B, Regan PH, Rubio B, Ur CA, Dobon JJV, Walker PM, Zhang YH. (2004) 'High-spin states populated in deep-inelastic reactions'. SOCIEDADE BRASILEIRA FISICA BRAZILIAN JOURNAL OF PHYSICS, Santos, BRAZIL: 5th Latin American Symposium on Nuclear Physics/26th Workshop on Nuclear Physics in Brazil 34 (3A), pp. 792-795.
  • Georgiev G, Neyens G, Hass M, Balabanski DL, Bingham C, Borcea C, Coulier N, Coussement R, Daugas JM, de France G, Gorska M, Grawe H, Grzywacz R, Lewitowicz M, Mach H, Matea I, Santos FD, Page RD, Pfutzner M, Penionzhkevich YE, Podolyak Z, Regan PH, Rykaczewski K, Sawicka M, Smirnova NA, Sobolev Y, Stanoiu M, Teughels S, Vyvey K. (2004) 'G-factors of isomeric states in the neutron-rich nuclei'. SPRINGER EUROPEAN PHYSICAL JOURNAL A, Legnaro, ITALY: International Conference on Nuclear Structure with Large Gamma-Arrays 20 (1), pp. 93-94.
  • Gadea A, Napoli DR, de Angelis G, Menegazzo R, Stefanini AM, Corradi L, Axiotis M, Berti L, Fioretto E, Kroell T, Latina A, Marginean N, Maron G, Martinez T, Rosso D, Rusu C, Toniolo N, Szilner S, Trotta M, Bazzacco D, Beghini S, Bellato M, Brandolini F, Farnea E, Isocrate R, Lenzi SM, Lunardi S, Montagnoli G, Pavan P, Alvarez CR, Scarlassara F, Ur C, Blasi N, Bracco A, Camera F, Leoni S, Million B, Pignanelli M, Pollarolo G, DeRosa A, Inglima C, La Commara M, La Rana G, Pierroutsakou D, Romoli M, Sandoli M, Bizzeti PG, Bizzeti-Sona AM, Lo Bianco G, Petrache CM, Zucchiatti A, Cocconi P, Quintana B, Beck C, Curien D, Duchene G, Haas F, Medina P, Papka P, Durell J, Freeman SJ, Smith A, Varley B, Fayz K, Pucknell V, Simpson J, Gelletly W, Regan P. (2004) 'Coupling a CLOVER detector array with the PRISMA magnetic spectrometer - Investigation of moderately neutron-rich nuclei populated by multinucleon transfer and deep inelastic collisions'. SPRINGER-VERLAG EUROPEAN PHYSICAL JOURNAL A, Legnaro, ITALY: International Conference on Nuclear Structure with Large Gamma-Arrays 20 (1), pp. 193-197.
  • Podolyak Z, Mohammadi S, De Angelis G, Zhang YH, Axiotis M, Bazzacco D, Bizzeti PG, Brandolini F, Broda R, Bucurescu D, Farnea E, Gelletly W, Gadea A, Ionescu-Bujor M, Iordachescu A, Kroll T, Langdown SD, Lunardi S, Marginean N, Martinez T, Medina NH, Quintana B, Regan PH, Rubio B, Ur CA, Valiente-Dobon JJ, Walker PM. (2004) 'Structure of neutron-rich nuclei from deep-inelastic reactions'. WORLD SCIENTIFIC PUBL CO PTE LTD INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS, Kazimierz Dolny, POLAND: Workshop on Nuclear Physics 13 (1), pp. 123-126.
  • Regan PH, Wheldon C, Yamamoto AD, Wu CY, Ashley S, Mumby-Croft P, Seaborne D, Macchiavelli AO, Cline D, Smith JF, Chakrawarthy RS, Cromaz M, Fallon P, Freeman SJ, Gelletly W, Gorgen A, Hayes A, Hua H, Langdown SD, Lee IY, Pearson CJ, Podolyak Z, Teng R, Valiente-Dobon JJ, Bijker R, Casten RF, Frank A. (2004) 'Structural evolution in the (N,Z,I-pi) coordinate frame for A-100'. AMER INST PHYSICS NUCLEAR PHYSICS, LARGE AND SMALL, Morelos, MEXICO: International Conference on Microscopic Studies of Collective Phenomena 726, pp. 157-162.
  • Podolyak Z, Gladnishki KA, Gerl J, Hellstrom M, Kopatch Y, Mandal S, Gorska M, Regan PH, Wollersheim HJ, Schmidt KH, Yordanov O, Bracco A, Kalfas CA. (2004) 'Angular momentum population in projectile fragmentation'. AMER INST PHYSICS LABYRINTH IN NUCLEAR STRUCTURE, Iraklion, GREECE: International Conference on the Labyrinth in Nuclear Structure 701, pp. 280-284.
  • Podolyak Z, Regan PH, Walker PM, Caamano M, Gladnishki K, Gerl J, Hellstrom M, Mayet P, Pfutzner M, Mineva M. (2003) 'Heavy nuclei studied in projectile fragmentation'. ELSEVIER SCIENCE BV NUCLEAR PHYSICS A, HALONG BAY, VIETNAM: International Symposium on Physics of Unstable Nuclei (ISPUN 02) 722, pp. 273C-278C.
  • Valiente-Dobon JJ, Pearson CJ, Regan PH, Sellin PJ, Gelletly W, Morton E, Boston A, Descovich M, Nolan PJ, Simpson J, Lazarus I, Warner D. (2003) 'Performance of a 6x6 segmented germanium detector for gamma-ray tracking'. ELSEVIER SCIENCE BV NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, ANN ARBOR, MICHIGAN: 10th Symposium on Radiation Measurements and Applications 505 (1-2), pp. 174-177.
  • Page RD, Andreyev AN, Appelbe DE, Butler PA, Freeman SJ, Greenlees PT, Herzberg RD, Jenkins DG, Jones GD, Jones P, Joss DT, Julin R, Kettunen H, Leino M, Rahkila P, Regan PH, Simpson J, Uusitalo J, Vincent SM, Wadsworth R. (2003) 'The GREAT spectrometer'. ELSEVIER SCIENCE BV NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, VICTORIA, CANADA: 14th International Conference on Electromagnetic Isotope Separators and Techniques Related the their Applications 204, pp. 634-637.
  • Gladnishki KA, Podolyak Z, Gerl J, Hellstrom M, Kopatch Y, Mandal S, Gorska M, Regan PH, Wollersheim HJ, Banu A, Benzoni G, Boardman H, La Commara M, Ekman J, Fahlander C, Geissel H, Grawe H, Kaza E, Korgul A, Matos M, Mineva MN, Page RD, Pearson CJ, Plettner C, Rudolph D, Scheidenberger C, Shishkin V, Sohler D, Summerer K, Valiente-Dobon JJ, Weick H, Winkler M. (2003) 'Isomer spectroscopy in the neutron-deficient lead region following projectile fragmentation'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, ZAKOPANE, POLAND: 37th Zakopane Meeting of Physics on Trends in Nuclear Physics 34 (4), pp. 2395-2398.
  • Bentley MA, Williams SJ, Joss DT, O'Leary CD, Bruce AM, Frankland L, Cameron JA, Svensson CE, Carpenter MP, Lister CJ, Reiter R, Seweryniak D, Fallon P, Gelletly W, Regan PH, Martinez-Pinedo G, Poves A, Solano JS, Rubio B, Warner DD. (2002) 'Mirror symmetry and coulomb energies at high angular momentum'. SOCIEDAD MEXICANA DE FISICA REVISTA MEXICANA DE FISICA, TAXCO, MEXICO: 25th Symposium on Nuclear Physics 48, pp. 123-128.
  • Pearson CJ, Dobon JJV, Regan PH, Sellin PJ, Morton E, Nolan PJ, Boston A, Descovich M, Thornhill J, Cresswell J, Lazarus I, Simpson J. (2002) 'Digital gamma-ray tracking algorithms in segmented germanium detectors'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON NUCLEAR SCIENCE, SAN DIEGO, CALIFORNIA: IEEE Nuclear Science Symposium 49 (3), pp. 1209-1215.
  • Neyens G, Georgiev G, Grzywacz R, Hass M, Santos FD, Lewitowicz M, Balabanski DL, Bingham C, Borcea C, Coulier N, Coussement R, Daugas JM, Defrance G, Goldring G, Gorska M, Grawe H, O'Leary C, Macovei I, Mach H, Page R, Pfutzner M, Penionzkevich YE, Podolyak Z, Regan PH, Rykaczewski K, Sawicka M, Smirnova NA, Sobolev Y, Teughels S, Vyvey K. (2002) 'g-factors of isomers around N approximate to 40, Z approximate to 28 from time-dependent Larmor precession on spin-aligned projectile-like fragments'. ELSEVIER SCIENCE BV NUCLEAR PHYSICS A, DIVONNE, FRANCE: 5th International Conference on Radioactive Nuclear Beams 701, pp. 403C-409C.
  • Al-Garni S, Walker PM, Regan PH, Narro JG, El-Masri HM, Roeckl E, Kirchner R, La Commara M, Mazzocchi C, Grawe H, Borcea R, Doring J, Wooding SC, Schmidt K, Wheldon C, Cullen DM, Schmidt-Ott WD, Norman E, Schroeder L, Wozniak G. (2002) 'Evidence for a K approximate to.139/2 beta-decaying isomer in Lu-177'. AMER INST PHYSICS NUCLEAR PHYSICS IN THE 21ST CENTURY, UNIV CALIF BERKELEY, BERKELEY, CA: International Nuclear Physics Conference 610, pp. 854-858.
  • Bentley MA, Williams SJ, Joss DT, O'Leary CD, Bruce AM, Cameron JA, Carpenter MP, Fallon P, Frankland L, Gelletly W, Lister CJ, Martinez-Pinedo G, Poves A, Regan PH, Reiter P, Rubio B, Sanchez-Solano J, Seweryniak D, Svensson CE, Vincent SM, Warner DD. (2002) 'Mirror symmetry and Coulomb effects in light N approximate to Z nuclei'. INST PHYSICS ACAD SCI CZECH REPUBLIC CZECHOSLOVAK JOURNAL OF PHYSICS, PRAGUE, CZECH REPUBLIC: Advanced-Study-Institute on Symmetries and Spin 52, pp. C597-C606.
  • Oi M, Regan PH, Xu FR, Walker PM, Rath AK, Stevenson PD. (2002) 'Cranked-Hartree-Fock-Bogoliubov analysis at the valence maximum: Yrast behaviour of Dy-170(66)104'. PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, KYOTO UNIV, YUKAWA INST THEORET PHYS, KYOTO, JAPAN: 10th Yukawa International Seminar on Physics of Unstable Nuclei (146), pp. 609-610.
  • Podolyak Z, Caamano M, Regan PH, Walker PM, Mayet P, Gerl J, Schlegel C, Hellstrom M, Mineva M, Pfutzner M. (2002) 'Isomeric decays in neutron-rich W, Os and Pt nuclei'. PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, KYOTO UNIV, YUKAWA INST THEORET PHYS, KYOTO, JAPAN: 10th Yukawa International Seminar on Physics of Unstable Nuclei (146), pp. 467-472.
  • Pfutzner M, Regan PH, Walker PM, Podolyak Z, Caamano M, Gerl J, Hellstrom M, Mayet P, Mineva MN. (2001) 'Population of high spin states in relativistic fragmentation'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, WARSAW, POLAND: 2001 NATO Advanced Research Workshop of the High Spin Physics 32 (9), pp. 2507-2518.
  • Mandal S, Gerl J, Geissel H, Hauschild K, Hellstrom M, Janas Z, Kojouharov I, Kopatch Y, Lemmon RC, Mayet P, Podolyak Z, Regan PH, Schaffner H, Schlegel C, Simpson J, Wollersheim HJ. (2001) 'Gamma-ray spectroscopy with relativistic exotic heavy-ions'. INDIAN ACADEMY SCIENCES PRAMANA-JOURNAL OF PHYSICS, SAHA INST NUCL PHYS, KOLKATA, INDIA: Workshop on Physics with Multi Detector Array 57 (1), pp. 161-164.
  • Lazarus IH, Appelbe DE, Butler PA, Coleman-Smith PJ, Cresswell JR, Freeman SJ, Herzberg RD, Hibbert I, Joss DT, Letts SC, Page RD, Pucknell VFE, Regan PH, Sampson J, Simpson J, Thornhill J, Wadsworth R. (2001) 'The GREAT triggerless total data readout method'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON NUCLEAR SCIENCE, LYON, FRANCE: Annual Nuclear Science Symposium (NSS) 48 (3), pp. 567-569.
  • Caamano M, Walker PM, Regan PH, Pearson CJ, Podolyak Z, Mayet P, Gerl J, Schlegel C, Hellstrom M, Mineva M, Pfutzner M. (2001) 'Isomeric decays in Pt-200'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, ZAKOPANE, POLAND: XXXVth Zakopane School of Physics on Trends in Nuclear Physics 32 (3), pp. 763-766.
  • Caamano M, Regan PH, Podolyka Z, Pearson CJ, Mayet P, Gerl J, Schlegel C, Pfutzner M, Hellstrom M, Mineva M. (2001) 'Nuclear structure of heavy neutron rich systems: Fragmentation spectroscopy with a 1 GeV per nucleon Pb-208 beam'. ELSEVIER SCIENCE BV NUCLEAR PHYSICS A, E LANSING, MICHIGAN: Conference on Nuclear Structure 2000 (NS2000) 682, pp. 223C-228C.
  • Lewitowicz M, Blank B, Daugas JM, Grawe H, Grzywacz R, Neyens G, Pfutzner M, Regan PH, Rykaczewski K. (2001) 'Nuclear structure studies by means of short-lived isomers at intermediate energies'. ELSEVIER SCIENCE BV NUCLEAR PHYSICS A, E LANSING, MICHIGAN: Conference on Nuclear Structure 2000 (NS2000) 682, pp. 175C-182C.
  • Becker F, Korten W, Butler PA, Hannachi F, Paris P, Buforn N, Chandler C, Jansen A, Houry M, Hubel H, Greenlees P, Jones PM, Julin R, Kankaanpaa H, Liang CE, Lopez-Martens A, Mergel E, Le Coz Y, Lucas R, Regan PH, Schonwasser G, Theisen C. (2000) 'Investigation of EO transition in Kr-74'. ROYAL SWEDISH ACAD SCIENCES PHYSICA SCRIPTA, IRAKLION, GREECE: International Conference on Achievements and Perspectives in Nuclear Structure T88, pp. 17-20.
  • Schlegel C, Regan PH, Pfutzner M, Gerl J, Hellstrom M, Podolyak Z, Caamano M, Mayet P, Aprahamian A, Benlliure J, Bruce AM, Butler PA, Gil DC, Cullen DM, Doring J, Enquist T, Farget E, Fox C, Narro JG, Gelletly W, Giovinazzo J, Gorska M, Grawe H, Grzywacz R, Kleinbohl A, Korten W, Lewitowicz M, Lucas R, Mach H, Mineva M, O'Leary C, De Oliveira F, Pearson CJ, Rejmund M, Sawicka M, Schaffner H, Schmidt K, Theisen C, Walker PM, Warner DD, Wheldon C, Wollersheim HJ, Wooding S, Xu F. (2000) 'K-isomers in very neutron-rich nuclei around mass 180'. ROYAL SWEDISH ACAD SCIENCES PHYSICA SCRIPTA, IRAKLION, GREECE: International Conference on Achievements and Perspectives in Nuclear Structure T88, pp. 72-76.
  • Vincent SM, Regan PH, Mohammadi S, Gelletly W, Blumenthal D, Carpenter MP, Davids CN, Janssens RVF, Lister CJ, Pearson CJ, Simpson J, Seweryniak D, Schwartz J, Warner DD. (1999) 'A yrast study of the A=61 isobars Cu-61(29) and Zn-61(30)'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, LEWES, ENGLAND: International Conference on the Physics of Nuclear Structure at the Extremes 25 (4), pp. 941-943.
  • Vincent SM, Regan PH, Blumenthal D, Carpenter M, Davids CN, Gelletly W, Janssens RVF, Lister CJ, Seweryniak D, Schwartz J, Simpson J, Warner DD. (1999) 'Discrete line spectroscopy of Ga-62(31) with AYEBALL'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, LEWES, ENGLAND: International Conference on the Physics of Nuclear Structure at the Extremes 25 (4), pp. 679-683.
  • Longour C, Narro JG, Blank B, Lewitowicz M, Miehe C, Regan PH, Applebe D, Axelsson L, Bruce AM, Catford WN, Chandler C, Clark RM, Cullen DM, Czajkowski S, Daugas JM, Dessagne P, Fleury A, Frankland L, Gelletly W, Giovinazzo J, Greenhalgh B, Grzywacz R, Harder M, Jones KL, Kelsall N, Kszczot T, Page RD, Pearson CJ, Reed AT, Sorlin O, Wadsworth R. (1999) 'Half-lives of the odd-odd N=Z nuclei Y-78, Nb-82, Tc-86'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, LEWES, ENGLAND: International Conference on the Physics of Nuclear Structure at the Extremes 25 (4), pp. 759-762.
  • Mohammadi S, Regan PH, Vincent SM, Blumenthal D, Carpenter M, Davids CN, Gelletly W, Janssens RVF, Lister CJ, Pearson CJ, Simpson J, Seweryniak D, Schwartz J, Warner DD. (1999) 'High spin states in Ni-58'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, LEWES, ENGLAND: International Conference on the Physics of Nuclear Structure at the Extremes 25 (4), pp. 909-912.
  • Vincent SM, Regan PH, Warner DD, Gelletly W, Simpson J, Bark R, Blumenthal D, Carpenter MP, Davids CN, Henderson DJ, Janssens RVF, Lister CJ, Nisius D, O'Leary CD, Pearson CJ, Saitoh T, Schwartz J, Seweryniak D, Tormanen S, Sherrill BM, Morrissey DJ, Davids CN. (1998) 'Probing the structure of the N=Z=31 nucleus Ga-62(31)'. AMER INST PHYSICS ENAM 98: EXOTIC NUCLEI AND ATOMIC MASSES, BELLAIRE, MI: Conference on Exotic Nuclei and Atomic Masses (ENAM 98) 455, pp. 450-455.
  • Catford WN, Mohammadi S, Regan PH, Purry CS, Gelletly W, Walker PM, Gyapong GJ, Simpson J, Warner DD, Davinson T, Neal R, Page RD, Shotter AC, Hibbert IM, Wadsworth R, Forbes SA, Bruce AM, Thwaites C, Thirolf P, VanDuppen P, Galster W, Ninane A, Vervier J, Decrock P, Huyse M, Szerypo J, Wauters J. (1997) 'High resolution gamma-ray spectroscopy with a radioactive beam'. ELSEVIER SCIENCE BV NUCLEAR PHYSICS A, OMIYA, JAPAN: 4th International Conference on Radioactive Nuclear Beams 616 (1-2), pp. C303-C310.
  • Regan PH, Chandler C, Pearson CJ, Blank B, Grzywacz R, Lewitowicz M, Bruce AM, Catford WN, Curtis N, Czajkowski S, Dessagne P, Fleury A, Gelletly W, Giovinazzo J, Janas Z, Longour C, Marchand C, Miehe C, Orr NA, Page RD, Pravikoff MS, Reed AT, SaintLaurent MG, Vincent SM, Wadsworth R, Warner DD, Winfield JS. (1997) 'Studies of isomeric states and limits of particle stability around N greater than or similar to Z greater than or similar to 40 using fragmentation reactions'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, ZAKOPANE, POLAND: XXXI Zakopane School of Physics 28 (1-2), pp. 431-442.

Teaching

Paddy currently teaches the following courses within the department:

1) 1st year Principles of Physics (1PP) ;  (2) MSc Dosimetry and Radiation Measurement ; (3) MSc Radiation and Environmental Protection Radiation Laboratories; (4) MSc Nuclear Power; (5) Introduction to Astronomy and Space Science (1IASS); (6) Naturally Occurring Radioactive Materials (MSc course).

Since 2000, he has also taught the following courses:

(1) Honours year Nuclear Structure and Astrophysics (3NSA) ; (2) PhD Nuclear Experimental Techniques (4NET); (3) 2nd year Galaxies and Large Scale Structures (2GLSS); (4) 1st year Atoms, Molecules and Quanta (1AMQ); (4) 2nd year nuclear astrophysics laboratory (2NAX). 

Departmental Duties

Paddy is the current MSc in Radiation and Environmental Protection Course Director and the Senior MPhys Research Year Coordinator.

Page Owner: phs1pr
Page Created: Monday 10 August 2009 13:08:06 by lb0014
Last Modified: Wednesday 16 November 2011 09:50:14 by phs1pr
Expiry Date: Wednesday 10 November 2010 13:07:28
Assembly date: Mon Oct 20 22:35:05 BST 2014
Content ID: 11691
Revision: 4
Community: 1256