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Professor Wilton Catford


Professor, Research Group Leader of Experimental Nuclear Physics
+44 (0)1483 686804
04 BC 04

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mediarelations@surrey.ac.uk

Phone: +44 (0)1483 684380 / 688914 / 684378
Out-of-hours: +44 (0)7773 479911
Senate House, University of Surrey
Guildford, Surrey GU2 7XH

My publications

Publications

Thies R, Heinz A, Adachi T, Aksyutina Y, Alcantara-Nunes J, Altstadt S, Alvarez-Pol H, Ashwood N, Aumann T, Avdeichikov V, Barr M, Beceiro-Novo S, Bemmerer D, Benlliure J, Bertulani CA, Boretzky K, Borge MJG, Burgunder G, Camano M, Caesar C, Casarejos E, Catford W, Cederkall J, Chakraborty S, Chartier M, Chulkov LV, Cortina-Gil D, Crespo R, Datta U, Diaz Fernandez P, Dillmann I, Elekes Z, Enders J, Ershova O, Estrade A, Farinon F, Fraile LM, Freer M, Freudenberger M, Fynbo HOU, Galaviz D, Geissel H, Gernhauser R, Gobel K, Golubev P, Diaz DG, Hagdahl J, Heftrich T, Heil M, Heine M, Henriques A, Holl M, Ickert G, Ignatov A, Jakobsson B, Johansson HT, Jonson B, Kalantar-Nayestanaki N, Kanungo R, Knobel R, Kroll T, Krucken R, Kurcewicz J, Kurz N, Labiche M, Langer C, Le Bleis T, Lemmon R, Lepyoshkina O, Lindberg S, Machado J, Marganiec J, Maroussov V, Mostazo M, Movsesyan A, Najafi A, Nilsson T, Nociforo C, Panin V, Paschalis S, Perea A, Petri M, Pietri S, Plag R, Prochazka A, Rahaman A, Rastrepina G, Reifarth R, Ribeiro G, Ricciardi MV, Rigollet C, Riisager K, Roder M, Rossi D, Sanchez del Rio J, Savran D, Scheit H, Simon H, Sorlin O, Stoica V, Streicher B, Taylor JT, Tengblad O, Terashima S, Togano Y, Uberseder E, Van de Walle J, Velho P, Volkov V, Wagner A, Wamers F, Weick H, Weigand M, Wheldon C, Wilson G, Wimmer C, Winfield JS, Woods P, Yakorev D, Zhukov MV, Zilges A, Zuber K (2016) Systematic investigation of projectile fragmentation using beams of unstable B and C isotopes, PHYSICAL REVIEW C 93 (5) ARTN 054601 AMER PHYSICAL SOC
Background: Models describing nuclear fragmentation and fragmentation-fission deliver important input for
planning nuclear physics experiments and future radioactive ion beam facilities. These models are usually benchmarked
against data from stable beam experiments. In the future, two-step fragmentation reactions with exotic
nuclei as stepping stones are a promising tool to reach the most neutron-rich nuclei, creating a need for models
to describe also these reactions. Purpose: We want to extend the presently available data on fragmentation reactions towards the light exotic
region on the nuclear chart. Furthermore, we want to improve the understanding of projectile fragmentation
especially for unstable isotopes.
Method: We have measured projectile fragments from 10,12-18C and 10-15B isotopes colliding with a carbon
target. These measurements were all performed within one experiment, which gives rise to a very consistent
dataset. We compare our data to model calculations.
Results: One-proton removal cross sections with different final neutron numbers (1pxn) for relativistic 10,12-18C
and 10-15B isotopes impinging on a carbon target. Comparing model calculations to the data, we find that EPAX
is not able to describe the data satisfactorily. Using ABRABLA07 on the other hand, we find that the average
excitation energy per abraded nucleon needs to be decreased from 27 MeV to 8.1 MeV. With that decrease
ABRABLA07 describes the data surprisingly well.
Conclusions: Extending the available data towards light unstable nuclei with a consistent set of new data have
allowed for a systematic investigation of the role of the excitation energy induced in projectile fragmentation. Most
striking is the apparent mass dependence of the average excitation energy per abraded nucleon. Nevertheless,
this parameter, which has been related to final-state interactions, requires further study.
Wilson J, Lebois M, Qi L, Amador-Celdran P, Bleuel D, Briz J, Carroll R, Catford W, De Witte H, Doherty D, Eloirdi R, Georgiev G, Gottardo A, Goasduff A, HadyDska-Kl?k K, Hauschild K, Hess H, Ingeberg V, Konstantinopoulos T, Ljungvall J, Lopez-Martens A, Lorusso G, Lozeva R, Lutter R, Marini P, Matea I, Materna T, Mathieu L, Oberstedt A, Oberstedt S, Panebianco S, Podolyak Z, Porta A, Regan P, Reiter P, Rezynkina K, Rose S, Sahin E, Seidlitz M, Serot O, Shearman R, Siebeck B, Siem S, Smith A, Tveten G, Verney D, Warr N, Zeiser F, Zielinska M (2017) Anomalies in the Charge Yields of Fission Fragments from the U(n,f)238 Reaction, Physical Review Letters 118 (22) pp. 222501-1 American Physical Society
Fast-neutron-induced fission of 238U at an energy just above the fission threshold is studied with a novel technique which involves the coupling of a high-efficiency ³-ray spectrometer (MINIBALL) to an inverse-kinematics neutron source (LICORNE) to extract charge yields of fission fragments via ³?³ coincidence spectroscopy. Experimental data and fission models are compared and found to be in reasonable agreement for many nuclei; however, significant discrepancies of up to 600% are observed, particularly for isotopes of Sn and Mo. This indicates that these models significantly overestimate the standard 1 fission mode and suggests that spherical shell effects in the nascent fission fragments are less important for low-energy fast-neutron-induced fission than for thermal neutron-induced fission. This has consequences for understanding and modeling the fission process, for experimental nuclear structure studies of the most neutron-rich nuclei, for future energy applications (e.g., Generation IV reactors which use fast-neutron spectra), and for the reactor antineutrino anomaly.
Banu A, Trache L, Tribble RE, Carstoiu F, Catford WN, Fernandez-Dominguez B, Horoi M, Orr NA, Roeder BT, Roussel-Chomaz P (2012) Direct radiative proton capture
Al(p,³)
Si studied via one-proton nuclear breakup of
Si,
Journal of Physics: Conference Series 337 (1) IOP
We present the results of an experimental work that studied the direct component of the radiative proton capture reaction
Al(p,³)
Si for its relevance in X-ray burst nucleosynthesis. The experiment was performed at GANIL using one-proton nuclear breakup reaction at intermediate energies to determine the Asymptotic Normalization Coefficient (ANC) of the system
Si’
Al + p. Using the ANC, we evaluated the corresponding astrophysical S factor and reaction rate.
Grieser M, Litvinov YA, Raabe R, Blaum K, Blumenfeld Y, Butler PA, Wenander F, Woods PJ, Aliotta M, Andreyev A, Artemyev A, Atanasov D, Aumann T, Balabanski D, Barzakh A, Batist L, Bernardes AP, Bernhardt D, Billowes J, Bishop S, Borge M, Borzov I, Bosch F, Boston AJ, Brandau C, Catford W, Catherall R, Cederkäll J, Cullen D, Davinson T, Dillmann I, Dimopoulou C, Dracoulis G, Düllmann CE, Egelhof P, Estrade A, Fischer D, Flanagan K, Fraile L, Fraser MA, Freeman SJ, Geissel H, Gerl J, Greenlees P, Grisenti RE, Habs D, von Hahn R, Hagmann S, Hausmann M, He JJ, Heil M, Huyse M, Jenkins D, Jokinen A, Jonson B, Joss DT, Kadi Y, Kalantar-Nayestanaki N, Kay BP, Kiselev O, Kluge HJ, Kowalska M, Kozhuharov C, Kreim S, Kröll T, Kurcewicz J, Labiche M, Lemmon RC, Lestinsky M, Lotay G, Ma XW, Marta M, Meng J, Mücher D, Mukha I, Müller A, Murphy AS, Neyens G, Nilsson T, Nociforo C, Nörtershäuser W, Page RD, Pasini M, Petridis N, Pietralla N, Pfützner M (2012) Storage ring at HIE-ISOLDE: Technical design report: Technical design report, European Physical Journal: Special Topics 207 (1) pp. 1-117
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.
Clement E, De France G, Casandjian JM, Goergen A, Korten W, Bouchez L, Chatillon A, Huerstel A, Le Coz Y, Obertelli A, Theisen C, Wilson JN, Delaroche J-P, Girod M, Goutte H, Peru S, Czosnyka T, Iwanicki J, Napiorkowski PJ, Srebrny J, Wrzosek-Lipska K, Zielinska M, Bree N, Stefanescu I, Van De Walle J, Andreoiu C, Butler PA, Herzberg R-D, Jenkins DG, Jones GD, Petts A, Becker F, Gerl J, Catford WN, Timis CN, Sletten G, Georgiev G, Ljungvall J (2011) EXPERIMENTAL MEASUREMENT OF THE DEFORMATION THROUGH THE ELECTROMAGNETIC PROBE: SHAPE COEXISTENCE IN EXOTIC KR AND SR ISOTOPES, INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS 20 (2) pp. 415-421 WORLD SCIENTIFIC PUBL CO PTE LTD
Beck C, Zafra ASI, Papka P, Thummerer S, Azaiez F, Bednarczyk P, Courtin S, Curien D, Dorvaux O, Lebhertz D, Nourreddine A, Robin J, Rousseau M, Von Oertzen W, Gebauer B, Kokalova T, Wheldon C, De Angelis G, Gadea A, Lenzi S, Szilner S, Napoli DR, Catford WN, Jenkins DG, Royer G (2008) ALPHA-CLUSTER STATES POPULATED IN Mg-24+C-12, INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS 17 (10) pp. 2049-2054 WORLD SCIENTIFIC PUBL CO PTE LTD
Jurado B, Savajols H, Mittig W, Orr NA, Roussel-Chomaz P, Baiborodin D, Catford WN, Chartier M, Demonchy CE, Dlouhy Z, Gillibert A, Giot L, Khouaja A, Lepine-Szily A, Lukyanov S, Mrazek J, Penionzhkevich YE, Pita S, Rousseau M, Villari AC (2007) Mass measurements of neutron-rich nuclei near the N=20 and 28 shell closures, PHYSICS LETTERS B 649 (1) pp. 43-48 ELSEVIER SCIENCE BV
Fernández-Domínguez B, Pietras B, Patterson N, Thomas JS, Orr N, Chartier M, Catford W, Achouri NL, Angêlique JC, Ashwood NI, Banu A, Bastin B, Brown J, Borcea R, Franchoo S, Freer M, Gaudefroy L, Laurent B, Labiche M, Lemmon RC, Negoita F, Paschalis S, Paul ES, Petri M, Roussel-Chomaz P, Staniou M, Taylor MJ, Trache L (2010) Structure around the island of inversion with single-neutron knockout reactions at GANIL, CERN-Proceedings 1 pp. 145-149
The nuclear structure of the 31Mg nucleus has been studied with the single-neutron knockout reaction. We report on the preliminary results of an experiment performed with the EXOGAM array coupled, for the first time, to the SPEG spectrometer at GANIL. We present a provisional result for the inclusive single-neutron knockout cross section of Ãinc= 90(5) mb. Preliminary exclusive cross sections for the measured bound states, including the ground state, are also presented. Finally, preliminary longitudinal momentum distributions for the ground state and first excited state are also shown. These results are compared to Monte Carlo Shell-Model calculations in the sd-pf region.
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 38 (4) pp. 1271-1275 ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS
Angélique JC, Timis C, Piétri S, Achouri NL, Baumann P, Borcea C, Buta A, Catford W, Courtin S, Daugas JM, Dessagne P, De Oliveira F, Dlouhy Z, Grévy S, Guillemaud-Mueller D, Hadeler R, Knipper A, Lecolley FR, Lecouey JL, Lewitowicz M, Liénard E, Miehe C, Mrazek J, Negoita F, Nowacki F, Orr NA, Penionzhkevich Y, Peter J, Poirier E, Stanoiu M, Tarasov O, Walter G (2006) Spectroscopy near the N=20 shell closure: ²-n decay studies of 33Mg and 35Al, AIP Conference Proceedings 831 pp. 134-138
An experimental spectroscopic investigation of some neutron rich Mg and Al isotopes around the shell closure N=20 has been performed. The delayed neutron and ³ spectra, following the ²-decay of 33Mg and 35Al have been measured using the delayed neutron detector array TONNERRE coupled with high efficiency EXOGAM clover detectors, a LEPS detector and eight low-energy neutron detectors. A detailed analysis of such spectra allows one to construct the level schemes of their daughters, 32,33Al and 34,35Si. The resulting spectroscopic information will provide stringent tests of large scale shell model calculations including np - nh excitations aimed at the understanding of the structural effects occurring in this region. © 2006 American Institute of Physics.
Beck C, Papka P, Sanchez i Zafraa A, Thummerer S, Azaiez F, Bednarczyk P, Courtin S, Curien D, Dorvaux O, Goasduff A, Lebhertz D, Nourreddine A, Rousseau M, Salsac M-D, von Oertzen W, Gebauer B, Wheldon C, Kokalova T, Efimov G, Zherebchevsky V, Schulz C, Bohlen HG, Kamanin D, de Angelis G, Gadea A, Lenzi S, Napoli DR, Szilner S, Milin M, Catford WN, Jenkins DG, Royer G (2011) CLUSTERS IN LIGHT NUCLEI, ACTA PHYSICA POLONICA B 42 (3-4) pp. 747-756 POLISH ACAD SCIENCES INST PHYSICS
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(+)), EUROPEAN PHYSICAL JOURNAL A 42 (3) pp. 489-493 SPRINGER
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, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 261 (1-2) pp. 1079-1083 ELSEVIER SCIENCE BV
Papka P, Brown TAD, Fulton BR, Watson DL, Fox SP, Groombridge D, Freer M, Clarke NM, Ashwood NI, Curtis N, Ziman V, McEwan P, Ahmed S, Catford WN, Mahboub D, Timis CN, Baldwin TD, Weisser DC (2007) Decay path measurements for the 2.429 MeV state in Be-9: Implications for the astrophysical alpha+alpha+n reaction, PHYSICAL REVIEW C 75 (4) ARTN 045803 AMER PHYSICAL SOC
Freer M, Ashwood NI, Curtis N, Malcolm J, Munoz-Britton T, Wheldon C, Ziman VA, Carter J, Fujita H, Usman I, Buthelezi Z, Foertsch SV, Neveling R, Perez SM, Smit FD, Fearick RW, Papka P, Swartz JA, Brown S, Catford WN, Wilson G, Bardayan D, Pain SD, Chipps K, Grzywacz-Jones K, Soic N, Achouri NL (2010) CLUSTER STATES IN C-12 AND C-14, MODERN PHYSICS LETTERS A 25 (21-23) pp. 1833-1837 WORLD SCIENTIFIC PUBL CO PTE LTD
Freer M, Ashwood NI, Curtis N, Malcolm JD, Munoz-Britton T, Price D, Wheldon C, Ziman VA, Achouri NL, Laurent B, Orr NA, Angulo C, Demaret P, Bardayan DW, Pain SD, Brown S, Catford WN, Harlin C, Thomas JS, Wilson G, Chipps KA, Milin M, Raabe R, Soi? N (2012) Resonances in 11C observed in the 4He(7Be,±)7Be and 4He(7Be,p)10B reactions, Physical Review C - Nuclear Physics 85 (1) American Physical Society
Measurements of the 4He(7Be,±)7Be and 4He(7Be,p)10B reactions were performed using 7Be beam energies of 7.1 and 23 MeV and a helium-4 target, employing the thick target technique. Resonances were observed between E 11C)=8.6 to 13.8 MeV. An R-matrix analysis was performed to characterize the spins and partial widths. This analysis showed that the observed sequence of states was consistent with that found for 7Li + ± resonant scattering populating resonances in 11B. A comparison of the proposed partial widths for decay with the Wigner limit indicates that several of the states are associated with cluster-like structures. © 2012 American Physical Society.
Wilson G, Catford WN, Brown S, Diget C, Adsley P, Fox S, Fulton B, Wadsworth R, Orr N, Al-Falou H, Ball G, Churchman R, Cross D, Dech J, Djongolov M, Hager U, Galinski N, Garnsworthy A, Hackman G, Orce J, Pearson C, Sjue S, Sumithrarachchi C, Triambak S, Williams S, Ashley R, Boston A, Boston H, Unsworth C, Austin R, Kanungo R, Blackmon J, Chen A, Chen J, Drake T, Martin J, Porter-Peden M, Sarazin F, Jamieson D, Leach K, Svensson C (2012) Towards Na via (d,p) with SHARC and TIGRESS and a novel zero-degree detector, Journal of Physics: Conference Series 381 (1) 012097 Institute of Physics
Nucleon transfer experiments have in recent years begun to be exploited in the study of nuclei far from stability, using radioactive beams in inverse kinematics. New techniques are still being developed in order to perform these experiments. The present experiment is designed to study the odd-odd nucleus Na which has a high density of states and therefore requires gamma-ray detection to distinguish between them. The experiment employed an intense beam of up to 3×10 pps of Na at 5.0 MeV/nucleon from the ISAC-II facility at triumf. The new silicon array SHARC was used for the first time and was coupled to the segmented clover gamma-ray array TIGRESS. A novel thin plastic scintillator detector was employed at zero degrees to identify and reject reactions occurring on the carbon component of the (CD) target. The efficiency of the background rejection using this detector is described with respect to the proton and gamma-ray spectra from the (d,p) reaction. © Published under licence by IOP Publishing Ltd.
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, ACTA PHYSICA POLONICA B 40 (3) pp. 879-883 WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO
Zielinska M, Goergen A, Clement E, Delaroche J-P, Girod M, Korten W, Buerger A, Catford W, Dossat C, Iwanicki J, Libert J, Ljungvall J, Napiorkowski PJ, Obertelli A, Pietak D, Rodriguez-Guzman R, Sletten G, Srebrny J, Theisen C, Wrzosek K (2009) Shape of Ar-44: Onset of deformation in neutron-rich nuclei near Ca-48, PHYSICAL REVIEW C 80 (1) ARTN 014317 AMER PHYSICAL SOC
Banu A, Carstoiu F, Achouri NL, Catford WN, Chartier M, Fernández-Domínguez B, Horoi M, Laurent B, Orr NA, Paschalis S, Patterson N, Pietras B, Roeder BT, Roussel-Chomaz P, Thomas JS, Trache L, Tribble RE (2012) One-proton breakup of 24Si and the 23Al(p,³)24Si reaction in type i x-ray bursts, Physical Review C - Nuclear Physics 86 (1)
Background: To understand explosive hydrogen burning in stars and to explore various explosive scenarios such as type I x-ray bursts (XRBs), reliable reaction rates are needed. The cross sections for radiative proton capture on near-dripline nuclei are necessary for the determination of the reaction rates, but cannot be measured directly. Purpose: To determine the reaction rate for the radiative proton capture reaction 23Al(p,³ )24Si using indirect methods and, as a consequence, evaluate if sequential 2p capture on 22Mg seed nuclei is significant at high temperatures. Method: Nonresonant radiative proton capture on 23Al is investigated using the one-proton breakup of 24Si at 61 MeV/nucleon and the asymptotic normalization coefficient (ANC) for 24Sigs’23Al+p is deduced. Results: From the ANC, the nonresonant component of the astrophysical S-factor for the 23Al(p,³)24Si reaction is determined and, using other new experimental data the resonant component is re-evaluated. Conclusions: The 23Al(p,³)24Si reaction is of interest for type I XRB nucleosynthesis and its reaction rate can affect both the 22Na abundance and the total energy output. New determinations of the rates for the 22Mg(p,³)23Al (p,³)24Si reaction chain are provided here and we point to the need that they be included in XRB scenarios. © 2012 American Physical Society.
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 ELSEVIER SCIENCE BV
Regan PH, Garnsworthy AB, Pietri S, Caceres L, Górska M, Rudolph D, Podolyák 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, Catford WN, 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 Nuclear Physics A 787 (1-4 SPEC. ISS.) pp. 491-498
The preliminary results from the RISING Stopped Beam Isomer Campaign are presented, with specific focus on results of the initial experiment to investigate isomeric decays along the N=Z line around A~80-90 following the projectile fragmentation of a 107Ag primary beam at an energy of 750 MeV per nucleon. A description of the technical aspects behind the design of the RISING array is presented, together with evidence for previously unreported isomeric decays in 87,88Tc and the N=Z nuclei 4182Nb and 4386Tc. © 2007 Elsevier B.V. All rights reserved.
Fernandez-Dominguez B, Thomas JS, Catford WN, Delaunay F, Brown SM, Orr NA, Rejmund M, Labiche M, Chartier M, Achouri NL, Al Falou H, Ashwood NI, Beaumel D, Blumenfeld Y, Brown BA, Chapman R, Curtis N, Force C, de France G, Franchoo S, Guillot J, Haigh P, Hammache F, Lapoux V, Lemmon RC, Marechal F, Moro M, Mougeot X, Mouginot B, Nalpas L, Navin A, Patterson N, Pietras B, Pollacco EC, Leprince A, Ramus A, Scarpaci JA, de Sereville N, Stephan I, Sorlin O, Wilson GL (2011) Emergence of the N=16 shell gap in O-21, PHYSICAL REVIEW C 84 (1) ARTN 011301 AMER PHYSICAL SOC
Caesar C, Simonis J, Adachi T, Aksyutina Y, Alcantara J, Altstadt S, Alvarez-Pol H, Ashwood N, Aumann T, Avdeichikov V, Barr M, Beceiro S, Bemmerer D, Benlliure J, Bertulani CA, Boretzky K, Borge MJG, Burgunder G, Caamano M, Casarejos E, Catford W, Cederkäll J, Chakraborty S, Chartier M, Chulkov L, Cortina-Gil D, Datta Pramanik U, Diaz Fernandez P, Dillmann I, Elekes Z, Enders J, Ershova O, Estrade A, Farinon F, Fraile LM, Freer M, Freudenberger M, Fynbo HOU, Galaviz D, Geissel H, Gernhäuser R, Golubev P, Gonzalez Diaz D, Hagdahl J, Heftrich T, Heil M, Heine M, Heinz A, Henriques A, Holl M, Holt JD, Ickert G, Ignatov A, Jakobsson B, Johansson HT, Jonson B, Kalantar-Nayestanaki N, Kanungo R, Kelic-Heil A, Knöbel R, Kröll T, Krücken R, Kurcewicz J, Labiche M, Langer C, Le Bleis T, Lemmon R, Lepyoshkina O, Lindberg S, Machado J, Marganiec J, Maroussov V, Menéndez J, Mostazo M, Movsesyan A, Najafi A, Nilsson T, Nociforo C, Panin V, Perea A, Pietri S, Plag R, Prochazka A, Rahaman A, Rastrepina G, Reifarth R, Ribeiro G, Ricciardi MV, Rigollet C, Riisager K, Röder M (2013) Beyond the neutron drip line: The unbound oxygen isotopes 25O and 26O, Physical Review C - Nuclear Physics 88 (3)
The very neutron-rich oxygen isotopes 25O and 26O are investigated experimentally and theoretically. The unbound states are populated in an experiment performed at the R3B-LAND setup at GSI via proton-knockout reactions from 26F and 27F at relativistic energies around 442 and 414 MeV/nucleon, respectively. From the kinematically complete measurement of the decay into 24O plus one or two neutrons, the 25O ground-state energy and width are determined, and upper limits for the 26O ground-state energy and lifetime are extracted. In addition, the results provide indications for an excited state in 26O at around 4 MeV. The experimental findings are compared to theoretical shell-model calculations based on chiral two- and three-nucleon (3N) forces, including for the first time residual 3N forces, which are shown to be amplified as valence neutrons are added. © 2013 American Physical Society.
Haigh P, Ashwood NI, Bloxham T, Curtis N, Freer M, Price D, Ziman V, Bohlen HG, Kokalova T, Schulz C, Von Oertzen W, Weldon C, Catford W, Harlin C (2008) Decay width measurements of excited states in 14C, Journal of Physics: Conference Series 111 (1)
Antonov AN, Gaidarov MK, Ivanov MV, Kadrev DN, Aïche M, Barreau G, Czajkowski S, Jurado B, Belier G, Chatillon A, Granier T, Taieb J, Doré D, Letourneau A, Ridikas D, Dupont E, Berthoumieux E, Panebianco S, Farget F, Schmitt C, Audouin L, Khan E, Tassan-Got L, Aumann T, Beller P, Boretzky K, Dolinskii A, Egelhof P, Emling H, Franzke B, Geissel H, Kelic-Heil A, Kester O, Kurz N, Litvinov Y, Münzenberg G, Nolden F, Schmidt K-H, Scheidenberger C, Simon H, Steck M, Weick H, Enders J, Pietralla N, Richter A, Schrieder G, Zilges A, Distler MO, Merkel H, Müller U, Junghans AR, Lenske H, Fujiwara M, Suda T, Kato S, Adachi T, Hamieh S, Harakeh MN, Kalantar-Nayestanaki N, Wörtche H, Berg GPA, Koop IA, Logatchov PV, Otboev AV, Parkhomchuk VV, Shatilov DN, Shatunov PY, Shatunov YM, Shiyankov SV, Shvartz DI, Skrinsky AN, Chulkov LV, Danilin BV, Korsheninnikov AA, Kuzmin EA, Ogloblin AA, Volkov VA, Grishkin Y, Lisin VP, Mushkarenkov AN, Nedorezov V, Polonski AL, Rudnev NV, Turinge AA, Artukh A, Avdeichikov V, Ershov SN, Fomichev A, Golovkov M, Gorshkov AV, Grigorenko L, Klygin S, Krupko S, Meshkov IN, Rodin A, Sereda Y, Seleznev I, Sidorchuk S, Syresin E, Stepantsov S, Ter-Akopian G, Teterev Y, Vorontsov AN, Kamerdzhiev SP, Litvinova EV, Karataglidis S, Alvarez Rodriguez R, Borge MJG, Fernandez Ramirez C, Garrido E, Sarriguren P, Vignote JR, Fraile Prieto LM, Lopez Herraiz J, Moya De Guerra E, Udias-Moinelo J, Amaro Soriano JE, Lallena Rojo AM, Caballero JA, Johansson HT, Jonson B, Nilsson T, Nyman G, Zhukov M, Golubev P, Rudolph D, Hencken K, Jourdan J, Krusche B, Rauscher T, Kiselev D, Trautmann D, Al-Khalili J, Catford W, Johnson R, Stevenson PD, Barton C, Jenkins D, Lemmon R, Chartier M, Cullen D, Bertulani CA, Heinz A (2011) The electronion scattering experiment ELISe at the International Facility for Antiproton and Ion Research (FAIR) - A conceptual design study, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 637 (1) pp. 60-76
Haigh PJ, Ashwood NI, Bloxham T, Curtis N, Freer M, McEwan P, Price D, Ziman V, Bohlen HG, Kokalova T, Schulz C, Torabi R, von Oertzen W, Wheldon C, Catford W, Harlin C, Kalpakchieva R, Massey TN (2008) Measurement of alpha and neutron decay widths of excited states of (14)C, PHYSICAL REVIEW C 78 (1) ARTN 014319 AMER PHYSICAL SOC
Grieser M, Litvinov YA, Raabe R, Blaum K, Blumenfeld Y, Butler PA, Wenander F, Woods PJ, Aliotta M, Andreyev A, Artemyev A, Atanasov D, Aumann T, Balabanski D, Barzakh A, Batist L, Bernardes A-P, Bernhardt D, Billowes J, Bishop S, Borge M, Borzov I, Bosch F, Boston AJ, Brandau C, Catford W, Catherall R, Cederkall J, Cullen D, Davinson T, Dillmann I, Dimopoulou C, Dracoulis G, Duellmann CE, Egelhof P, Estrade A, Fischer D, Flanagan K, Fraile L, Fraser MA, Freeman SJ, Geissel H, Gerl J, Greenlees P, Grisenti RE, Habs D, von Hahn R, Hagmann S, Hausmann M, He JJ, Heil M, Huyse M, Jenkins D, Jokinen A, Jonson B, Joss DT, Kadi Y, Kalantar-Nayestanaki N, Kay BP, Kiselev O, Kluge H-J, Kowalska M, Kozhuharov C, Kreim S, Kroell T, Kurcewicz J, Labiche M, Lemmon RC, Lestinsky M, Lotay G, Ma XW, Marta M, Meng J, Muecher D, Mukha I, Mueller A, Murphy ASJ, Neyens G, Nilsson T, Nociforo C, Noertershaeuser W, Page RD, Pasini M, Petridis N, Pietralla N, Pfuetzner M, Podolyak Z, Regan P, Reed MW, Reifarth R, Reiter P, Repnow R, Riisager K, Rubio B, Sanjari MS, Savin DW, Scheidenberger C, Schippers S, Schneider D, Schuch R, Schwalm D, Schweikhard L, Shubina D, Siesling E, Simon H, Simpson J, Smith J, Sonnabend K, Steck M, Stora T, Stoehlker T, Sun B, Surzhykov A, Suzaki F, Tarasov O, Trotsenko S, Tu XL, Van Duppen P, Volpe C, Voulot D, Walker PM, Wildner E, Winckler N, Winters DFA, Wolf A, Xu HS, Yakushev A, Yamaguchi T, Yuan YJ, Zhang YH, Zuber K (2012) Storage ring at HIE-ISOLDE Technical design report, EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS 207 (1) pp. 1-117
Cizewski JA, Jones KL, Pain SD, Thomas JS, Baktash C, Bardayan DW, Blackmon JC, Gross C, Liang JF, Shapira D, Smith MS, Kozub RL, Moazen BH, Nesaraja CD, Carter HK, Johnson MS, Fitzgerald RP, Visser DW, Greife U, Livesay RJ, Catford W, Ma Z (2005) Neutron transfer reactions with neutron-rich radioactive ion beams, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 241 (1-4) pp. 200-203 ELSEVIER SCIENCE BV
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) ARTN 044313 American Physical Society
Fernández-Domínguez B, Lemmon RC, Timis C, Labiche M, Catford WN, Chartier M, Ashwood N, Amzal N, Baldwin TD, Burns M, Caballero L, Chapman R, Curtis N, De France G, Freer M, Gelletly W, Liang X, Orr NA, Pain SD, Pucknell VPE, Rejmund M, Rubio B, Savajols H, Sorlin O, Spohr K, Thiesen C, Warner DD (2006) Studies of the single particle structure of exotic nuclei using transfer reactions, AIP Conference Proceedings 831 pp. 347-351
The TIARA+VAMOS+EXOGAM set-up has recently been installed at GANIL to study the single-particle structure of exotic nuclei. The unique characteristics of the TIARA array, combined with the large acceptance spectrometer VAMOS and the high efficiency Germanium detector array EXOGAM, has allowed high-resolution measurements of transfer reactions in inverse kinematics using low intensity exotic beams. We will describe the experimental set-up, data analysis and preliminary results of the first experiments using a 24Ne beam from SPIRAL, concentrating in particular on the performance of VAMOS that has been used to detect the heavy fragments after the (d,p), (d,d) and (d,t) reactions. © 2006 American Institute of Physics.
Timofeyuk NK, Fernandez-Dominguez B, Descouvemont P, Catford WN, Delaunay F, Thomas JS (2012) Core excitations and narrow states beyond the proton dripline: The exotic nucleus Al-21, PHYSICAL REVIEW C 86 (3) ARTN 034305 AMER PHYSICAL SOC
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) ARTN 034310 AMER PHYSICAL SOC
Catford WN (2013) Conference summary: An experimental perspective, Journal of Physics: Conference Series 436 (1)
The experimental results reported at this conference, the themes that emerged and the implications for future work are examined. Some example highlights, chosen from a personal perspective are discussed.
Myalski S, Maj A, Podolyák Z, Kmiecik M, Bednarczyk P, Grebosz J, Regan PH, Garnsworthy AB, Pietri S, Rudolph D, Steer SJ, Becker F, Gerl J, Górska M, Grawe H, Kojouharov I, Schaffner H, Wollersheim HJ, Prokopowicz W, Benzoni G, Blank B, Brandau C, Bruce AM, Cáceres 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, Pfützner M, Saito T, Shizuma T, Simons AJ, Schwertel S, Tachenov S, Walker PM, Werner-Malento E, Wieland O (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
We have investigated nuclear fragmentation reactions of a relativistic 208Pb 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.
Curtis N, Achouri NL, Ashwood NI, Bohlen HG, Catford WN, Clarke NM, Freer M, Haigh PJ, Laurent B, Orr NA, Patterson NP, Soic N, Thomas JS, Ziman V (2008) Breakup reaction study of the Brunnian nucleus (10)C, PHYSICAL REVIEW C 77 (2) ARTN 021301 AMER PHYSICAL SOC
Banu A, Trache L, Tribble RE, Carstoiu F, Negoita F, Rotaru F, Orr N, Achouri L, Laurent B, Roeder B, Chartier M, Fernandez-Dominguez B, Paschalis S, Pietras B, Roussel-Chomaz P, Gaudefroy L, Lemmon R, Labiche M, Catford W, Patterson N, Thomas J, Freer M, Horoi M, Bonaccorso A (2008) Breakup of proton-rich nuclei 24Si, 23Al, 22Mg, 21Na at intermediate energies for reaction rates in explosive H-burning in novae, Proceedings of Science
We discuss the use of one proton-removal reactions of loosely bound nuclei at intermediate energies as an indirect method in nuclear astrophysics, with particular reference to the results of a GANIL experiment with a cocktail beam around 23Al at 50 MeV/nucleon. Momentum distributions of the core fragments, inclusive and in coincidence with gamma rays detected with EXOGAM, were measured. From them we determine mixing ratios in the structure of the ground states of the projectile nuclei and the asymptotic normalization of their wave functions. The method has the advantage that can be used for beams of low quality, such as cocktail beams, and intensities as low as a few pps. The proton breakup reactions provide information to determine astrophysical (p,³) reaction rates that are outside the reach of other direct or indirect methods, or complementary information to the use of transfer reactions (the ANC method) which require radioactive beams of much better purity and intensity. Preliminary results on proton breakup of 24Si, 23Al, 22Mg and 21Na will be presented. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial- ShareAlikeLicence.
Daugas JM, Sawicka M, Pfützner M, Matea I, Grawe H, Grzywacz R, Achouri NL, Angélique JC, Baiborodin D, Becker F, Bélier G, Bentida R, Béraud R, Bingham C, Borcea C, Borcea R, Bouchez E, Buta A, Catford WN, Dragulescu E, Emsallem A, De France G, Giovinazzo J, Girod M, Goutte H, Gorgiev G, Grzywacz-Jones KL, Hammache F, Ibrahim F, Lemmon RC, Lewitowicz M, Lopez-Jimenez MJ, Mayet P, Méot V, Negoita F, De Oliveira-Santos F, Perru O, Regan PH, Roig O, Rykaczewski K, Saint-Laurent MG, Sauvestre JE, Sletten G, Sorlin O, Stanoiu M, Stefan I, Stodel C, Theisen C, Verney D, Zylicz J (2006) Isomeric island in the vicinity of 66Fe, AIP Conference Proceedings 831 pp. 427-429
An island of isomers have recently been observed on both sides of the N=40 shell below the Ni isotopes. Isomeric states in the 65Fe and 67Fe allow the knowledge of the single particle structure around the ½g 9/2 shell. Moreover, the excitation energy of the first 2+ and 4+ states in the 68Fe have been established by ²-³ 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.
Clement E, Gorgen A, Korten W, Bouchez E, Chatillon A, Delaroche J-P, Girod M, Goutte H, Hurstel A, Le Coz Y, Obertelli A, Peru S, Theisen C, Wilson JN, Zielinska M, Andreoiu C, Becker F, Butler PA, Casandjian JM, Catford WN, Czosnyka T, de France G, Gerl J, Herzberg R-D, Iwanicki J, Jenkins DG, Jones GD, Napiorkowski PJ, Sletten G, Timis CN (2007) Shape coexistence in neutron-deficient krypton isotopes, PHYSICAL REVIEW C 75 (5) ARTN 054313 AMERICAN PHYSICAL SOC
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 ELSEVIER SCIENCE BV
Wilson GL, Catford WN, Orr NA, Diget C, Matta A, Hackman G, Williams SJ, Celik IC, Achouri NL, Al Falou H, Ashley R, Austin RAE, Ball GC, Blackmon JC, Boston AJ, Boston HC, Brown SM, Cross DS, Djongolov M, Drake TE, Hager U, Fox SP, Fulton BR, Galinski N, Garnsworthy AB, Jamieson D, Kanungo R, Leach KG, Orce JN, Pearson CJ, Porter-Peden M, Sarazin F, Simpson EC, Sjue S, Smalley D, Sumithrarachchi C, Triambak S, Unsworth C, Wadsworth R (2016) Shell evolution approaching the N = 20 island of inversion: Structure of 26Na, Physics Letters B
The levels in 26Na with single particle character have been observed for the first time using the d(25Na, p³ ) reaction at 5 MeV/nucleon. The measured excitation energies and the deduced spectroscopic factors are in good overall agreement with (0+1)'É(0+1)'É shell model calculations performed in a complete spsdfpspsdfp basis and incorporating a reduction in the N=20 gapN=20 gap. Notably, the 1p3/21p3/2 neutron configuration was found to play an enhanced role in the structure of the low-lying negative parity states in 26Na, compared to the isotone 28Al. Thus, the lowering of the 1p3/21p3/2 orbital relative to the 0f7/20f7/2 occurring in the neighbouring Z=10Z=10 and 12 nuclei ? 25,27Ne and 27,29Mg ? is seen also to occur at Z=11Z=11 and further strengthens the constraints on the modelling of the transition into the island of inversion.
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) ARTN 034304 AMER PHYSICAL SOC
Khouaja A, Villari ACC, Benjelloun M, Hirata D, Auger G, Savajols H, Mittig W, Roussel-Chomaz P, Orr NA, Saint-Laurent MG, Pita S, Gillibert A, Chartier M, Demonchy CE, Giot L, Baiborodin D, Penionzhkevich Y, Catford WN, Lepine-Szily A, Dlouhy Z (2006) Reaction cross-section and reduced strong absorption radius measurements of neutron-rich nuclei in the vicinity of closed shells N=20 and N=28, NUCLEAR PHYSICS A 780 (1-2) pp. 1-12 ELSEVIER SCIENCE BV
Banu A, Trache L, Carstoiu F, Achouri NL, Bonaccorso A, Catford WN, Chartier M, Dimmock M, Fernandez-Dominguez B, Freer M, Gaudefroy L, Horoi M, Labiche M, Laurent B, Lemmon RC, Negoita F, Orr NA, Paschalis S, Patterson N, Paul ES, Petri M, Pietras B, Roeder BT, Rotaru F, Roussel-Chomaz P, Simmons E, Thomas JS, Tribble RE (2011) Structure of Al-23 from the one-proton breakup reaction and astrophysical implications, PHYSICAL REVIEW C 84 (1) ARTN 015803 AMER PHYSICAL SOC
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), ACTA PHYSICA POLONICA B 40 (3) pp. 885-888 WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO
Fernández-Domínguez B, Lemmon RC, Timis C, Labiche M, Catford WN, Chartier M, Ashwood NI, Amzal N, Baldwin TD, Burns M, Caballero L, Chapman R, Curtis N, de France G, Freer M, Gelletly W, Liang X, Orr NA, Pain SD, Pucknell VPE, Rejmund M, Rubio B, Savajols H, Sorlin O, Spohr K, Thiesen C, Warner DD (2007) Single particle structure of exotic nuclei with transfer reactions, Progress in Particle and Nuclear Physics 59 (1) pp. 389-391
We report here on the first results obtained from the study of the 24Ne(d, p)25Ne reaction performed with SPIRAL beam at GANIL using the new TIARA+V AMOS+EXOGAM setup. © 2007.
Lecouey J-L, Orr NA, Marques FM, Achouri NL, Angelique J-C, Brown BA, Carstoiu F, Catford WN, Clarke NM, Freer M, Fulton BR, Grevy S, Hanappe F, Jones KL, Labiche M, Lernmon RC, Ninane A, Sauvan E, Spohr KM, Stuttge L (2009) Single-proton removal reaction study of B-16, PHYSICS LETTERS B 672 (1) pp. 6-11 ELSEVIER SCIENCE BV
Lotay G, Christian G, Ruiz C, Akers C, Burke DS, Catford WN, Chen AA, Connolly D, Davids B, Fallis J, Hager U, Hutcheon DA, Mahl A, Rojas A, Sun X (2016) Direct Measurement of the Astrophysical K-38(p,gamma)Ca-39 Reaction and Its Influence on the Production of Nuclides toward the End Point of Nova Nucleosynthesis, PHYSICAL REVIEW LETTERS 116 (13) ARTN 132701 AMER PHYSICAL SOC
Calinescu S, Stanoiu M, Negoita F, Borcea C, Borcea R, Petrone C, Rotaru F, Cáceres L, Thomas JC, Lepailleur A, Roger T, Sorlin O, Grévy S, Sohler D, Dombradi Z, Kuti I, Vajta Z, Bowry M, Catford W, Podolyak Z, Wilson E, Franchoo S, Niikura M, Stefan I, Lukyanov S, Penionzhkevich Y, Mrazek J, Gillibert R (2013) Study of the neutron rich sulfure isotope S through intermediate energy Coulomb excitation, Journal of Physics: Conference Series 413 (1)
The reduced transition probability B(E2: 3/2’7/2
) has been measured in S using Coulomb excitation at intermediate energy. The nucleus of interest was produced by fragmentation of a Ca beam at GANIL. The reaction products were separated in the LISE spectrometer. After Coulomb-excitation of S in a Pb target, the ³ rays emitted inflight were detected by 64 BaF detectors of the Chteau de Cristal array. The preliminary value deduced for the reduced transition probability B(E2: 3/2 ’7/2
) is in agreement with the predictions of the shell model calculations and supports a prolate-spherical shape coexistence in the S nucleus.
Ramus A, Achouri NL, Al Falou H, Ashwood NI, Beaumel D, Blumenfeld Y, Brown SM, Catford WN, Chapman R, Chartier M, Curtis N, Delaunay F, Fernandez-Dominguez B, Force C, De France G, Franchoo S, Guillot J, Gupta D, Haigh P, Hammache F, Labiche M, Lapoux V, Lemmon RC, Marechal F, Martin B, Mougeot X, Mouginot B, Nalpas L, Navin A, Orr NA, Patterson N, Pietras B, Pollacco EC, Le Prince A, Rejmund M, Scarpaci JA, De Sereville N, Stefan I, Sorlin O, Thomas JS, Wilson GL (2009) STUDY OF THE O-20(d,t) REACTION WITH THE TIARA-MUST2-VAMOS-EXOGAM SETUP, INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS 18 (10) pp. 2056-2060 WORLD SCIENTIFIC PUBL CO PTE LTD
Muñoz-Britton T, Freer M, Ashwood NI, Brown TAD, Catford WN, Curtis N, Fox SP, Fulton BR, Harlin CW, Laird AM, Mumby-Croft P, Murphy ASJ, Papka P, Price DL, Vaughan K, Watson DL, Weisser DC (2010) Search for the 2+ excitation of the Hoyle state in 12C using the 12C(12C,3±)12C reaction, Journal of Physics G: Nuclear and Particle Physics 37 (10) 105104
Ashwood NI, Freer M, Achouri NL, Bloxham TR, Catford WN, Curtis N, Haigh PJ, Harlin CW, Patterson NP, Price DL, Soi? N, Thomas JS (2009) Spectroscopy of 16O using ± + 12C resonant scattering in inverse kinematics, Journal of Physics G: Nuclear and Particle Physics 36 (5) 055105 Institute of Physics
Ameasurement of the ±(12C, ±) 12Creaction has been performed using resonant
scattering with a gas target. Beam energies of 46, 52, 56 and 63 MeV were
used to populate resonances in the excitation energy range of 11.6?22.9 MeV
in 16O. The angular distributions of the elastic scattering were measured at zero
degrees, using an array of segmented silicon strip detectors with a minimum
range of 0æ?30æ in the centre-of-mass. The spins of 8 resonances between
14.1 and 18.5 MeV were obtained, confirming spin assignments made using
elastic scattering in normal kinematics. An R-matrix analysis of the data was
performed which indicates that the present understanding of 16O in this region
is good, but not complete.
Smalley D, Sarazin F, Nunes FM, Brown BA, Adsley P, Al-Falou H, Andreoiu C, Baartman B, Ball GC, Blackmon JC, Boston HC, Catford WN, Chagnon-Lessard S, Chester A, Churchman RM, Cross DS, Diget CA, Di Valentino D, Fox SP, Fulton BR, Garnsworthy A, Hackman G, Hager U, Kshetri R, Orce JN, Orr NA, Paul E, Pearson M, Rand ET, Rees J, Sjue S, Svensson CE, Tardiff E, Varela AD, Williams SJ, Yates S (2014) Two-neutron transfer reaction mechanisms in C-12(He-6,He-4)C-14 using a realistic three-body He-6 model, PHYSICAL REVIEW C 89 (2) ARTN 024602 AMER PHYSICAL SOC
Catford WN, Celik IC, Wilson GL, Matta A, Orr NA, Diget CA, Adsley P, Al-Falou H, Ashley R, Austin RAE, Ball GC, Blackmon JC, Boston AJ, Boston HC, Brown SM, Cross DS, Djongolov M, Drake TE, Hager U, Fox SP, Fulton BR, Galinski N, Garnsworthy AB, Hackman G, Jamieson D, Kanungo R, Leach K, Martin JP, Orce JN, Pearson CJ, Porter-Peden M, Sarazin F, Sjue S, Sumithrarachchi C, Svensson CE, Triambak S, Unsworth C, Wadsworth R, Williams SJ (2015) Structure of <sup>26</sup>Na via a novel technique using (d; p³) with a radioactive <sup>25</sup>Na beam, Acta Physica Polonica B 46 (3) pp. 527-536
States in 26Na were populated in the (d, p³) reaction, induced by bombarding deuterium target nuclei with an intense reaccelerated beam of 25Na ions from the ISAC2 accelerator at TRIUMF. Gamma-rays were recorded in coincidence with protons and used to extract differential cross sections for 21 states up to the neutron decay threshold of 5 MeV. Results for levels below 3 MeV are discussed in detail and compared with shell model calculations and with previous work. The angular distributions of decay gamma-rays were measured for individual states and are compared to theoretically calculated distributions, highlighting some issues for future work.
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 H 126 nuclei, International Journal of Modern Physics E 18 (4) pp. 1002-1007
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.
Reifarthl R, Altstadt S, Goebell K, Heftrich T, Heil M, Koloczek A, Langer C, Plag R, Pohl M, Sonnabend K, Weigand M, Adachi T, Aksouh F, Al-Khalili J, AlGarawi M, AlGhamdi S, Alkhazov G, Alkhomashi N, Alvarez-Pol H, Alvarez-Rodriguez R, Andreev V, Andrei B, Atar L, Aumann T, Adeichikov V, Bacri C, Bagchi S, Barbieri C, Beceiro S, Beck C, Beinrucker C, Belier G, Bemmerer D, Bendel M, Benlliure J, Benzoni G, Berjillos R, Bertini D, Bertulani C, Bishop S, Blasi N, Bloch T, Blumenfeld Y, Bonaccorso A, Boretzky K, Botvina A, Boudard A, Boutachkov P, Boztosun I, Bracco A, Brambilla S, Briz Monago J, Caamano M, Caesar C, Camera F, Casarejos E, Catford W, Cederkall J, Cederwall B, Chartier M, Chatillon A, Cherciu M, Chulkov L, Coleman-Smith P, Cortina-Gil D, Crespi F, Crespo R, Cresswell J, Csatlos M, Dechery F, Davids B, Davinson T, Derya V, Detistov P, Diaz Fernandez P, DiJuliot D, Dmitry S, Dore D, Duenas J, Dupont E, Egelhof P, Egorova I, Elekes Z, Enders J, Endres J, Ershov S, Ershova O, Fernandez-Dominguez B, Fetisov A, Fiori E, Fomichev A, Fonseca M, Fraile L, Freer M, Friese J, Borge MG, Galaviz Redondo D, Gannon S, Garg U, Gasparic I, Gasques L, Gastineau B, Geissel H, Gernhaeuser R, Ghosh T, Gilbert M, Glorius J, Golubev P, Gorshkov A, Gourishett A, Grigorenko L, Gulyas J, Haiduc M, Hammache F, Harakeh M, Hass M, Heine M, Hennig A, Henriques A, Herzberg R, Holl M, Ignatov A, Ignatyuk A, Ilieva S, Ivanov M, Iwasa N, Jakobsson B, Johansson H, Jonson B, Joshi P, Junghans A, Jurado B, Koerner G, Kalantar N, Kanungo R, Kelic-Heil A, Kezzar K, Khan E, Khanzadeev A, Kiselev O, Kogimtzis M, Koerper D, Kraeckmann S, Kroell T, Kruecken R, Krasznahorkay A, Kratz J, Kresan D, Krings T, Krumbholz A, Krupko S, Kulessa R, Kumar S, Kurz N, Kuzmin E, Labiche M, Langanke K, Lazarus I, Le Bleis T, Lederer C, Lemasson A, Lemmon R, Liberati V, Litvinov Y, Loeher B, Lopez Herraiz J, Muenzenberg G, Machado J, Maev E, Mahata K, Mancusi D, Marganiec J, Martinez Perez M, Marusov V, Mengoni D, Million B, Morcelle V, Moreno O, Movsesyan A, Nacher E, Najafi M, Nakamura T, Naqvi F, Nikolski E, Nilsson T, Nociforo C, Nolan P, Novatsky B, Nyman G, Ornelas A, Palit R, Pandit S, Panin V, Paradela C, Parkar V, Paschalis S, Pawlowski P, Perea A, Pereira J, Petrache C, Petri M, Pickstone S, Pietralla N, Pietri S, Pivovarov Y, Potlog P, Prokofiev A, Rastrepina G, Rauscher T, Ribeiro G, Ricciardi M, Richter A, Rigollet C, Riisager K, Rios A, Ritter C, Frutos TR, Rodriguez Vignote J, Roeder M, Romig C, Rossi D, Roussel-Chomaz P, Rout P, Roy S, Soederstroem P, Sarkar MS, Sakuta S, Salsac M, Sampson J, del Rio Saez JS, Sanchez Rosado J, Sanjari S, Sarriguren P, Sauerwein A, Savran D, Scheidenberger C, Scheit H, Schmidt S, Schmitt C, Schnorrenberger L, Schrock P, Schwengner R, Seddon D, Sherrill B, Shrivastava A, Sidorchuk S, Silva J, Simon H, Simpson E, Singh P, Slobodan D, Sohler D, Spieker M, Stach D, Stan E, Stanoiu M, Stepantsov S, Stevenson P, Strieder F, Stuhl L, Suda T, Suemmerer K, Streicher B, Taieb J, Takechi M, Tanihata I, Taylor J, Tengblad O, Ter-Akopian G, Terashima S, Teubig P, Thies R, Thoennessen M, Thomas T, Thornhill J, Thungstrom G, Timar J, Togano Y, Tomohiro U, Tornyi T, Tostevin J, Townsley C, Trautmann W, Trivedi T, Typel S, Uberseder E, Udias J, Uesaka T, Uvarov L, Vajta Z, Velho P, Vikhrov V, Volknandt M, Volkov V, von Neumann-Cose P, von Schmid M, Wagner A, Wamers F, Weick H, Wells D, Westerberg L, Wieland O, Wiescher M, Wimmer C, Wimmer K, Winfield JS, Winkel M, Woods P, Wyss R, Yakorev D, Yavor M, Cardona JZ, Zartova I, Zerguerras T, Zgura I, Zhdanov A, Zhukov M, Zieblinski M, Zilges A, Zuber K (2016) Nuclear astrophysics with radioactive ions at FAIR, NUCLEAR PHYSICS IN ASTROPHYSICS VI (NPA6) 665 IOP PUBLISHING LTD
Gorgen A, Clement E, Korten W, Bouchez E, Chatillon A, Hurstel A, Le Coz Y, Theisen C, Wilson JN, Zielinska M, Andreoiu C, Becker F, Butler P, Casandjian JM, Catford WN, Czosnyka T, de France G, Gerl J, Herzberg R-D, Iwanicki J, Jenkins DG, Jones GD, Napiorkowski PJ, Sletten G, Timis C (2007) Shape coexistence in Kr-74 and Kr-76, EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS 150 pp. 117-120 EDP SCIENCES S A
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) ARTN 031305 AMER PHYSICAL SOC
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) ARTN 061302 AMER PHYSICAL SOC
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, Gr)bosz 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
Freer M, Ashwood NI, Curtis N, Munoz-Britton T, Wheldon C, Ziman VA, Brown S, Catford WN, Patterson NP, Thomas JS, Weisser DC (2008) Excited states of Be-8 populated via the p(Li-7, He-4)He-4 and p(Li-7, He-4*)He-4 resonant reactions, JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS 35 (12) ARTN 125108 IOP PUBLISHING LTD
Beck C, Zafra ASI, Haas F, Papka P, Rauch V, Rousseau M, Azaiez F, Bednarczyk P, Curien D, Dorvaux O, Nourreddine A, Robin J, Oertzen WV, Gebauer B, Kokalova T, Thummerer S, Angelis GD, Gadea A, Lenzi S, Napoli DR, Szilner S, Catford WN, Jenkins D (2003) Search for 12C+12C molecule in 24Mg* populated by 24Mg+12C, Nucl.Phys.A 734 pp. 453-456
The gamma-decay properties of 24Mg excited states are investigated in the
inverse reaction 24Mg+12C at E(24Mg) = 130 MeV. At this energy the direct
inelastic scattering populates a 24Mg* energy region where 12C+12C breakup
resonances can occur. Very exclusive data were collected with the Binary
Reaction Spectrometer (BRS) in coincidence with EUROBALL installed at the
VIVITRON Tandem facility of the IReS at Strasbourg. The experimental detection
system is decribed and preliminary results of binary reaction coincid data are
presented.
Cizewski JA, Jones KL, Kozub RL, Pain SD, Adekola A, Bardayan DW, Blackmon JC, Catford WN, Chae KY, Chipps KA, Erikson L, Gaddis A, Grzywacz R, Harlin C, Hatarik R, Howard J, Johnson MS, Kapler R, Królas W, Liang JF, Livesay R, Ma Z, Matei C, Moazen B, Nesaraja CD, O'Malley P, Paulauskas SV, Peters WA, Shapira D, Shriner Jr JF, Sissom DJ, Smith MS, Swan TP, Thomas JS, Wilson GL (2009) Neutron-transfer reaction studies with fission fragment radioactive ion beams near 132Sn, AIP Conference Proceedings 1175 pp. 147-153
Catford WN, Timis CN, Lemmon RC, Labiche M, Orr NA, Caballero L, Chapman R, Chartier M, Rejmund M, Savajols H (2006) Neutron transfer studied with a radioactive beam of Ne-24, using TIARA at spiral, Exotic Nuclei and Nuclear/Particle Astrophysics pp. 12-19 WORLD SCIENTIFIC PUBL CO PTE LTD
Assie M, Scarpaci J, Lacroix D, Angelique J, Bazin D, Beaumel D, Blumenfeld Y, Catford W, Chabot M, Chatterjee A, Fallot M, Iwasaki H, Marechal F, Mengoni D, Monrozeau C, Nyberg J, Petrache C, Skaza F, Tuna T (2009) Neutron correlations in He-6 viewed through nuclear break-up, EUROPEAN PHYSICAL JOURNAL A 42 (3) pp. 441-446 SPRINGER
Curtis N, Ashwood NI, Baby LT, Baldwin TD, Bloxham TR, Catford WN, Caussyn DD, Freer M, Harlin CW, McEwan P, Price DL, Spingler D, Wiedenhover I (2006) alpha-decaying states in Be-10,Be-12 populated in the Be-10(C-14,Be-10,Be-12) reaction, PHYSICAL REVIEW C 73 (5) ARTN 057301 AMERICAN PHYSICAL SOC
Fernández-Domínguez B, Pereira-López X, Timofeyuk NK, Descouvemont P, Catford WN, Delaunay F (2015) Spectroscopic study of the exotic nucleus P 25, Physical Review C - Nuclear Physics 91 (2)
© 2015 American Physical Society.Motivated by the importance of P25 for the two-proton decay of S26 and for searches of the mirror analog of the island of inversion near N=16, we present the first predictions for the spectroscopy of the exotic isotope P25 obtained in the shell model, a potential model, and a microscopic-cluster model. All models predict P25 to be unbound, with an energy in the range 0.78-1.03 MeV, which favors previous mass systematics over more recent revisions. We show that P25 possesses a rich low-lying spectrum that should be accessible by experimental studies. All of the predicted states below 7 MeV, except one, are narrow. Many of them are built on the excited-core states of 24Si for which the Coulomb barrier is raised. For decays into the 24Si(g.s.)+p channel we determined the proton widths based on their link to the asymptotic normalization coefficients (ANCs) of their mirror analogs in 25Ne. We determine these ANCs from the analysis of the transfer reaction 24Ne(d,p)25Ne. The proton widths for decay into excited-state channels are obtained in model calculations. The only broad state is the intruder 3/2-, the mirror analog of which has been recently observed in 25Ne. The 25P(3/2-) energy is lower than that in 25Ne, suggesting that the island of inversion may persist on the proton-rich side. All excited states of P25 have at least two decay modes and are expected to populate variously the 21,2+ and 4+ states in 24Si, which then decay electromagnetically.
Curtis N, Ashwood NI, Catford WN, Clarke NM, Freer M, Mahboub D, Metelko CJ, Pain SD, Soi? N, Weisser DC (2006) Search for three centre cluster structures in 10,11,12B, AIP Conference Proceedings 853 pp. 160-164
The 7Li(7Li, 11B*)t, 12C(7Li, 10B*)9Be and 7Li(7Li, 12B*)d reactions have been studied at 58 MeV in order to determine the relative strengths of the H + Be and ± + Li decay of 10,11,12B. A study of the relative yields for the decay of a number of excited states in 10,11,12B*, obtained following the coincident detection of the H + Be and ± + Li decay fragments, indicates that the ±-decay channel dominates in all cases. © 2006 American Institute of Physics.
Roeder M, Adachi T, Aksyutina Y, Alcantara J, Altstadt S, Alvarez-Pol H, Ashwood N, Atar L, Aumann T, Avdeichikov V, Barr M, Beceiro S, Bemmerer D, Benlliure J, Bertulani C, Boretzky K, Borge MJG, Burgunder G, Caamano M, Caesar C, Casarejos E, Catford W, Cederkall J, Chakraborty S, Chartier M, Chulkov L, Cortina-Gil D, Crespo R, Pramanik UD, Diaz-Fernandez P, Dillmann I, Elekes Z, Enders J, Ershova O, Estrade A, Farinon F, Fraile LM, Freer M, Freudenberger M, Fynbo H, Galaviz D, Geissel H, Gernhaeuser R, Goebel K, Golubev P, Diaz DG, Hagdahl J, Heftrich T, Heil M, Heine M, Heinz A, Henriques A, Holl M, Ickert G, Ignatov A, Jakobsson B, Johansson H, Jonson B, Kalantar-Nayestanaki N, Kanungo R, Kelic-Heil A, Knoebel R, Kroell T, Kruecken R, Kurcewicz J, Kurz N, Labiche M, Langer C, Le Bleis T, Lemmon R, Lepyoshkina O, Lindberg S, Machado J, Marganiec J, Mostazo Caro M, Movsesyan A, Najafi MA, Nilsson T, Nociforo C, Panin V, Paschalis S, Perea A, Petri M, Pietri S, Plag R, Prochazka A, Rahaman MA, Rastrepina G, Reifarth R, Ribeiro G, Ricciardi MV, Rigollet C, Riisager K, Rossi D, del Rio Saez JS, Savran D, Scheit H, Simon H, Sorlin O, Stoica V, Streicher B, Taylor J, Tengblad O, Terashima S, Thies R, Togano Y, Uberseder E, Van de Walle J, Velho P, Volkov V, Wagner A, Wamers F, Weick H, Weigand M, Wheldon C, Wilson G, Wimmer C, Winfield JS, Woods P, Yakorev D, Zhukov M, Zilges A, Zuber K (2016) Coulomb dissociation of N-20,N-21, PHYSICAL REVIEW C 93 (6) ARTN 065807 AMER PHYSICAL SOC
Neutron-rich light nuclei and their reactions play an important role for the creation of chemical elements. Here, data from a
Coulomb dissociation experiment on 20,21N are reported. Relativistic 20,21N ions impinged on a lead target and the Coulomb
dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the
19N(n, ³)
20N and 20N(n, ³)
21N excitation functions and thermonuclear reaction rates have been determined. The 19N(n, ³)
20N
rate is up to a factor of 5 higher at T the predicted fluorine abundance.
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 150 pp. 165-168 EDP SCIENCES S A
Beck C, Zafra ASI, Papka P, Thummerer S, Azaiez F, Courtin S, Curien D, Dorvaux O, Lebhertz D, Nourreddine A, Rousseau M, Von Oertzen W, Gebauer B, Kokalova T, Wheldon C, De Angelis G, Gadea A, Lenzi S, Napoli DR, Szilner S, Catford WN, Jenkins DG, Royer G (2009) Reaction mechanisms in 24Mg+ 12C and32S+ 24Mg, AIP Conference Proceedings 1098 pp. 207-212
The occurence of ``exotic'' shapes in light N = Z ±-like nuclei is investigated for 24Mg+12C and 32S+24Mg. Various approaches of superdeformed and hyperdeformed bands associated with quasimolecular resonant structures with low spin are presented. For both reactions, exclusive data were collected with the Binary Reaction Spectrometer in coincidence with EUROBALL IV installed at the VIVITRON Tandem facility of Strasbourg. Specific structures with large deformation were selectively populated in binary reactions and their associated ³-decays studied. The analysis of the binary and ternary reaction channels is discussed.
Curtis N, Ashwood NI, Baby LT, Baldwin TD, Bloxham TR, Catford WN, Caussyn DD, Freer M, Harlin CW, McEwan P, Price DL, Spingler D, Wiedenhover I (2006) ±-decaying states in Be10,12 populated in the Be10(C14,Be10,12) reaction, Physical Review C - Nuclear Physics 73 (5)
A search has been made for the He6+He6 and ± + He8 decay of the molecular rotational band in Be12 using the Be10(C14,Be12*)C12 reaction at 88.5 MeV. Although the ± + He6 decay of Be10 was observed in the data set there is no evidence for the breakup of Be12. The cross-section upper limits for the Be10(C14,He6 He6)C12 and Be10(C14,± He8)C12 reactions are 50 and 300 nb respectively. © 2006 The American Physical Society.
Curtis N, Ashwood NI, Freer M, Munoz-Britton T, Wheldon C, Ziman VA, Brown S, Catford WN, Patterson NP, Thomas JS, Weisser DC (2009) Search for the ± + 6He decay of 10Be via the 16O(18O, 10Be*)24Mg reaction, Journal of Physics G: Nuclear and Particle Physics 36 (1)
Catford WN, Timis CN, Lemmon RC, Labiche M, Orr NA, Caballero L, Chapman R, Chartier M, Rejmund M, Savajols H, Collaboration FTTIARA (2009) Neutron Transfer Studied with a Radioactive beam of 24Ne, using TIARA at
SPIRAL,
A general experimental technique for high resolution studies of nucleon
transfer reactions using radioactive beams is briefly described, together with
the first new physics results that have been obtained with the new TIARA array.
These first results from TIARA are for the reaction 24Ne(d,p)25Ne, studied in
inverse kinematics with a pure radioactive beam of 100,000 pps from the SPIRAL
facility at GANIL. The reaction probes the energies of neutron orbitals
relevant to very neutron rich nuclei in this mass region and the results
highlight the emergence of the N=16 magic number for neutrons and the
associated disappearance of the N=20 neutron magic number for the very neutron
rich neon isotopes.
Zielinska M, Goergen A, Buerger A, Catford W, Clement E, Dossat C, Iwanicki J, Korten W, Liungvall J, Napiorkowski PJ, Pietak D, Sletten G, Srebrny J, Theisen CH, Wrzosek K (2008) Coulomb excitation of neutron-rich Ar-44 at spiral, ACTA PHYSICA POLONICA B 39 (2) pp. 519-524 WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO
Banu A, Trache L, Carstoiu F, Orr NA, Achouri NL, Bonaccorso A, Catford WN, Chartier M, Fernandez-Dominguez B, Freer M, Gaudefroy L, Horoi M, Labiche M, Laurent B, Lemmon RC, Negoita F, Paschalis S, Patterson N, Pietras B, Roeder B, Rotaru F, Roussel-Chomaz P, Simmons E, Thomas JS, Tribble RE (2010) Astrophysically important reaction rates for novae and X-ray bursts from proton breakup at intermediate energies, AIP Conference Proceedings 1304 pp. 339-343
We discuss the use of one-nucleon removal reactions of loosely bound nuclei at intermediate energies as an indirect method in nuclear astrophysics. The breakup reactions are
proved to be good spectroscopic tools and can be used to study a large number of loosely bound
proton- or neutron-rich nuclei over a wide range of beam energies. As peripheral processes, they
can be used to extract asymptotic normalization coefficients (ANCs) from which non-resonant
capture reaction rates of astrophysical interest can be calculated parameter free.
In this talk, we present results of a proton-breakup experiment carried out at GANIL (France)
with a cocktail beam centered around 23Al at 50 MeV/nucleon. Momentum distributions of the
breakup fragments, inclusive and in coincidence with gamma rays detected by EXOGAM Germanium clover array, were measured in the focal plan of SPEG energy-loss spectrometer.
We present in particular the investigations of reaction rates for 22Mg(p,³)23Al and 23Al(p,³)24Si important for novae and X-ray bursts, respectively.
Diget CA, Fox SP, Smith A, Williams S, Porter-Peden M, Achouri L, Adsley P, Al-Falou H, Austin RAE, Ball GC, Blackmon JC, Brown S, Catford WN, Chen AA, Chen J, Churchman RM, Dech J, DiValenti D, Djongolov M, Fulton BR, Garnsworthy A, Hackman G, Hager U, Kshetri R, Kurchaninov L, Laird AM, Martin J-P, Matos M, Orce JN, Orr NA, Pearson CJ, Ruiz C, Sarazin F, Sjue S, Smalley D, Svensson CE, Taggart M, Tardiff E, Wilson GL (2011) SHARC: Silicon Highly-segmented Array for Reactions and Coulex used in conjunction with the TIGRESS gamma-ray spectrometer, JOURNAL OF INSTRUMENTATION 6 ARTN P02005 IOP PUBLISHING LTD
Rahaman A, Datta Pramanik U, Aumann T, Beceiro S, Boretzky K, Caesar C, Carlson BV, Catford WN, Chakraborty S, Chatterjee S, Chartier M, De Angelis G, Cortina-Gil D, Gonzalez-Diaz D, Emling H, Diaz Fernandez P, Fraile LM, Ershova O, Geissel H, Heil M, Jonson B, Kelic A, Johansson H, Kruecken R, Kroll T, Kurcewicz J, Langer C, Le Bleis T, Leifels Y, Munzenberg G, Marganiec J, Nociforo C, Najafi A, Panin V, Paschalis S, Pietri S, Plag R, Reifarth R, Ricciardi V, Rossi D, Ray J, Simon H, Scheidenberge C, Typel S, Taylor J, Togano Y, Volkov V, Weick H, Wagner A, Wamers F, Weigand M, Winfield JS, Yakorev D, Zoric M (2014) Study of ground state wave-function of the Neutron-rich 29,30Na isotopes through coulomb breakup, EPJ Web of Conferences 66
Coulomb breakup of unstable neutron rich nuclei 29,30Na around the 'island of inversion' has been studied at energy around 434 MeV/nucleon and 409 MeV/nucleon respectively. Four momentum vectors of fragments, decay neutron from excited projectile and ³-rays emitted from excited fragments after Coulomb breakup are measured in coincidence. For these nuclei, the low-lying dipole strength above one neutron threshold can be explained by direct breakup model. The analysis for Coulomb breakup of 29,30Na shows that large amount of the cross section yields the 28Na, 29Na core in ground state. The predominant ground-state configuration of 29,30Na is found to be 28Na(g.s) ½s1/2 and 29Na(g.s) ½s1/2,respectively. © Owned by the authors, published by EDP Sciences, 2014.
Assie M, Scarpaci J, Lacroix D, Angelique J, Bazin D, Beaumel D, Blumenfeld Y, Catford W, Chabot M, Chatterjee A, Fallot M, Iwasaki H, Marechal F, Monrozeau C, Nyberg J, Petrache C, Skaza F, Tuna T (2010) NEUTRON CORRELATIONS IN He-6 VIEWED THROUGH NUCLEAR BREAK-UP, MODERN PHYSICS LETTERS A 25 (21-23) pp. 1846-1849 WORLD SCIENTIFIC PUBL CO PTE LTD
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) ARTN 064303 AMER PHYSICAL SOC
Labiche M, Catford WN, Lemmon RC, Timis CN, Chapman R, Orr NA, Fernandez-Dominguez B, Moores G, Achouri NL, Amzal N, Appleton S, Ashwood NI, Baldwin TD, Burns M, Caballero L, Cacitti J, Casadjian JM, Chartier M, Curtis N, Faiz K, de France G, Freer M, Gautier JM, Gelletly W, Iltis G, Lecornu B, Liang X, Marry C, Merrer Y, Olivier L, Pain SD, Pucknell VFE, Raine B, Rejmund M, Rubio B, Saillant F, Savajols H, Sorlin O, Spohr K, Theisen C, Voltolini G, Warner DD (2010) TIARA: A large solid angle silicon array for direct reaction studies with radioactive beams, NUCL INSTRUM METH A 614 (3) pp. 439-448 ELSEVIER SCIENCE BV
A compact, quasi-4À position sensitive silicon array, TIARA, designed to study direct reactions induced by radioactive beams in inverse kinematics is described here. The Transfer and Inelastic All-angle Reaction Array (TIARA) consists of 8 resistive charge division detectors forming an octagonal barrel around the target and a set of double-sided silicon-strip annular detectors positioned at each end of the barrel. The detector was coupled to the ³-ray array EXOGAM and the spectrometer VAMOS at the GANIL Laboratory to demonstrate the potential of such an apparatus with radioactive beams. The reaction, well known in direct kinematics, has been carried out in inverse kinematics for that purpose. The observation of the ground state and excited states at 7.16 and 7.86 MeV is presented here as well as the comparison of the measured proton angular distributions with DWBA calculations. Transferred l-values are in very good agreement with both theoretical calculations and previous experimental results obtained in direct kinematics.
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 38 (4) pp. 1277-1282 ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS
Freer M, Achouri NL, Angulo C, Ashwood NI, Bardayan DW, Brown S, Catford WN, Chipps KA, Curtis N, Demaret P, Harlin C, Laurent B, Malcolm JD, Milin M, Munoz-Britton T, Orr NA, Pain SD, Price D, Raabe R, Soic N, Thomas JS, Wheldon C, Wilson G, Ziman VA (2012) Resonances in (11)C observed in the (4)He((7)Be, alpha)(7)Be and (4)He((7)Be, p)(10)B reactions, PHYSICAL REVIEW C 85 ARTN 014304 American Physical Society
Measurements of the 4He(7Be,±)7Be and 4He(7Be,p)10B reactions were performed using 7Be beam energies of 7.1 and 23 MeV and a helium-4 target, employing the thick target technique. Resonances were observed between Ex(11C)=8.6 to 13.8 MeV. An R-matrix analysis was performed to characterize the spins and partial widths. This analysis showed that the observed sequence of states was consistent with that found for 7Li + ± resonant scattering populating resonances in 11B. A comparison of the proposed partial widths for decay with the Wigner limit indicates that several of the states are associated with cluster-like structures.
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 38 (4) pp. 1283-1286 ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS
Malcolm JD, Freer M, Ashwood NI, Curtis N, Munoz-Britton T, Wheldon C, Ziman VA, Catford WN, Brown S, Wilson G, Soic N, Bardayan D, Pain SD, Achouri NL, Chipps K, Crzywacz-Jones K (2012) Study of states in C via the Be( He, He) Be reaction, Journal of Physics: Conference Series 381 (1)
A study of the Be( He, He) Be reaction has been performed at Be beam energies of 25.0, 27.0, 29.0, 32.0, 34.0, 38.0, 40.0, 42.0, 44.0 and 46.0 MeV. The measurements were to explore possible molecular rotational bands in C. Three states at excitation energies of E 18.8, 19.76 and 20.66 MeV have been measured and their spins have been determined to be 5 , 5 and 6 , respectively. © Published under licence by IOP Publishing Ltd.
Zieblinski M, Jastrzab M, Bednarczyk P, Ciemaa M, Dutkiewicz E, Kmiecik M, Krzysiek M, Lekki J, Maj A, Szklarz Z, Wasilewska B, Dudeo M, Hadynska-Klek K, Napiorkowski P, Brambilla S, Genolini B, Schmitt C, Catford W, Nakhostin M, Yavuzkanat N, Dorvaux O, Nanal V, Pillay RG, Pose MS, Mishra S, Dokania N, Mathimalar S, Singh V, Katyan N, Chakrabarty DR, Datar VM, Kumar S, Mishra G, Mukhopadhyay S, Pandit D, Erturk S (2013) Testing of the Paris LaBr3-NaI phoswich detector with high energy gamma-rays, Acta Physica Polonica B 44 (3) pp. 651-656
We report on tests of LaBr3:Ce-NaI:Tl phoswich detectors with-rays at various ³-ray energies, up to 22.56 MeV, using radioactive sources and nuclear reactions induced by proton beams delivered by accelerators at IFJ PAN Kraków and PLF Mumbai. Two-dimensional analysis of complex waveforms recorded with digital electronics is compared to analog discrimination methods. Both approaches allow to resolve the LaBr3:Ce and NaI:Tl signal components, and to construct clean associated ³-ray spectra. A digital algorithm to be implemented for the PARIS scintillator array is investigated.
Baldwin TD, Catford WN, Mahboub D, Timis CN, Ashwood NI, Clarke NM, Curtis N, Ziman V, Brown TAD, Fox SP, Fulton BR, Groombridge D, Watson DL, Pucknell VFE, Weisser DC (2012) First excited 1/2(+) state in B-9, PHYSICAL REVIEW C 86 (3) ARTN 034330 AMER PHYSICAL SOC
Randisi G, Leprince A, Al Falou H, Orr NA, Marqués FM, Achouri NL, Angélique JC, Ashwood N, Bastin B, Bloxham T, Brown BA, Catford WN, Curtis N, Delaunay F, Freer M, De Góes Brennand E, Haigh P, Hanappe F, Harlin C, Laurent B, Lecouey JL, Ninane A, Patterson N, Price D, Stuttgé L, Thomas JS (2014) Structure of 13 Be probed via secondary-beam reactions, Physical Review C - Nuclear Physics 89 (3)
The low-lying level structure of the unbound neutron-rich nucleus 13Be has been investigated via breakup on a carbon target of secondary beams of 14,15B at 35 MeV/nucleon. The coincident detection of the beam velocity 12Be fragments and neutrons permitted the invariant mass of the 12Be+n and 12Be+n+n systems to be reconstructed. In the case of the breakup of 15B, a very narrow structure at threshold was observed in the 12Be+n channel. Analysis of the 12Be+n+n events demonstrated that this resulted from the sequential decay of the unbound 14Be(2+) state rather than a strongly interacting s-wave virtual state in 13Be, as had been surmised in stable beam fragmentation studies. Single-proton removal from 14B was found to populate a broad low-lying structure some 0.7 MeV above the neutron-decay threshold, in addition to a less prominent feature at around 2.4 MeV. Based on the selectivity of the reaction and a comparison with (0-3) É shell-model calculations, the low-lying structure is concluded to arise from closely spaced JÀ=1/2+ and 5/2+ resonances (Er=0.40±0.03 and 0.85-0.11+0.15 MeV), while the broad higher-lying feature is a second 5/2+ level (Er=2.35±0.14 MeV). Taken in conjunction with earlier studies, the results suggest that the lowest 1/2+ and 1/2- levels lie relatively close together below 1 MeV. © 2014 American Physical Society.
Jones KJ, Pain SD, Kozub RL, Adekola AS, Bardayan DW, Blackmon JC, Catford WN, Chae KY, Chipps K, Cizewskit JA, Erikson L, Gaddis AL, Greife U, Grzywacz R, Harlin C, Hatarik R, Howard JA, James J, Kapler R, WKrólas, Liang JF, Ma Z, Matei C, Moazen BH, Nesaraja CD, O'Malley PD, Patterson NP, Paulauskas SV, Shapira D, Shriner Jr JF, Sikora M, Sissom DJ, Smith MS, Swan TP, Thomas JS, Wilson GL (2009) Studies of nuclei close to132 Sn using single-neutron transfer reactions, AIP Conference Proceedings 1098 pp. 153-160
Brown SM, Catford WN, Thomas JS, Fernandez-Dominguez B, Orr NA, Labiche M, Rejmund M, Achouri NL, Al Falou H, Ashwood NI, Beaumel D, Blumenfeld Y, Brown BA, Chapman R, Chartier M, Curtis N, de France G, de Sereville N, Delaunay F, Drouart A, Force C, Franchoo S, Guillot J, Haigh P, Hammache F, Lapoux V, Lemmon RC, Leprince A, Marechal F, Mougeot X, Mouginot B, Nalpas L, Navin A, Patterson NP, Pietras B, Pollacco EC, Ramus A, Scarpaci JA, Stefan I, Wilson GL (2012) Low-lying neutron f p-shell intruder states in Ne-27, PHYSICAL REVIEW C 85 011302 American Physical Society
The quenching of the N=20 shell gap in neutron-rich nuclei is investigated by studying the single-particle structure of 27Ne via neutron transfer using a 26Ne beam. Two low-lying negative-parity intruder states have been observed, the lowest of which is identified as JÀ=3/2?, confirming earlier speculations. A level identified as 7/2? is observed higher in energy than the 3/2?, contrary to the ordering at ²-stability and at an energy significantly different from the predictions of previous shell-model calculations. The measured energies and deduced spectroscopic factors are well reproduced in full (0,1)-?É 0s-0p-0d-1s-0f-1p calculations in which there is a significant ad hoc reduction (
Soi? N, Freer M, Donadille L, Clarke NM, Leask PJ, Catford WN, Jones KL, Mahboub D, Fulton BR, Greenhalgh BJ, Watson DL (2006) Experimental evidence for cluster structure of 11B excited states, AIP Conference Proceedings 853 pp. 171-176
The kinematically complete measurements of the 7Li( 9Be,±±t)5He reaction at Ebeam = 55 and 70 MeV have been performed and the reconstructed 11B excitation energy spectra were compared with the 7Li(9Be, ±7Li)5He results obtained at the same beam energies. Evidence was found for the t+8Be(g.s.) decay of the 11B excited states at 13.1 and 14.4 MeV, the ±+7Li*(4.652 MeV) decay of the states at 14.4 and 17.5 MeV and for the t+ 8Be*(3.03 MeV) decay of the 17.5 MeV state in 11B. A study of the relative yields for the decay of the 14.4 MeV state indicates that significant part of ±-decay strength goes into the 2±+t three-body decay channel. © 2006 American Institute of Physics.
Walshe J, Freer M, Wheldon C, Achouri LN, Ashwood NI, Catford WN, Celik IC, Curtis N, Delaunay F, Fernández-Domínguez B, Grassi L, Kokalova T, Marqués M, Orr NA, Prepolec L, Scuderi V, Soi? N, Toki? V (2014) The thick target inverse kinematics technique with a large acceptance silicon detector array, Journal of Physics: Conference Series 569 (1)
© Published under licence by IOP Publishing Ltd.An experimental technique for studying elastic scattering using a thick gas target is described, with a measurement of the ±(24Ne,±) reaction used as an example. Advantages such as ease, detector efficiency, and the possibility of measuring the cross section at 180° in the centre-of-mass are discussed. It is shown that a resolution of tens of keV is practical at zero degrees, and that the dominant contribution to the resolution for large angles is angular straggling of the beam in the entrance window. The use of helium gas as the target allows direct measurement of a-cluster states.
Pain SD, Catford WN, Orr NA, Angélique JC, Ashwood NI, Bouchat V, Clarke NM, Curtis N, Freer M, Fulton BR, Hanappe F, Labiche M, Lecouey JL, Lemmon RC, Mahboub D, Ninane A, Normand G, Soi? N, Stuttge L, Timis CN, Tostevin JA, Winfield JS, Ziman V (2006) Structure of 12Be: intruder d-wave strength at N=8., Phys Rev Lett 96 (3)
The breaking of the N=8 shell-model magic number in the 12Be ground state has been determined to include significant occupancy of the intruder d-wave orbital. This is in marked contrast with all other N=8 isotones, both more and less exotic than 12Be. The occupancies of the [FORMULA: SEE TEXT]orbital and the [FORMULA: SEE TEXT], intruder orbital were deduced from a measurement of neutron removal from a high-energy 12Be beam leading to bound and unbound states in 11Be.
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 (2007) First results from the stopped RISING campaign at GSI: The mapping of isomeric decays in highly exotic nuclei, Six International Conference of the Balkan Physical Union 899 pp. 19-22 AMER INST PHYSICS
Catford WN (2014) Chapter 3: What can we learn from transfer, and how is best to do it?, Lecture Notes in Physics 879 (1) pp. 67-122
Freer M, Malcolm JD, Achouri NL, Ashwood NI, Bardayan DW, Brown SM, Catford WN, Chipps KA, Cizewski J, Curtis N, Jones KL, Munoz-Britton T, Pain SD, Soi? N, Wheldon C, Wilson GL, Ziman VA (2014) Resonances in C 14 observed in the He 4 (10Be,±) Be 10 reaction, Physical Review C - Nuclear Physics 90 (5)
© 2014 American Physical Society.The ±(Be10,±)Be10 resonant scattering reaction has been measured at nine Be10 beam energies from 25 to 48 MeV, scanning out resonances in C14 from excitation energies of 13 to 24 MeV. Angular distribution measurements were used to assign the spin and parity of 5- to resonances at Ex=18.82(2) and 19.67(2) MeV and 6+ at Ex=20.80(2) MeV. The data also strongly indicate a 3- resonance at 17.32(2) MeV. The systematic uncertainty on the excitation energies is 175 keV. An R-matrix analysis has been performed for the excitation energy range 16.5 to 22 MeV. The data are discussed in terms of cluster bands in C14.
Altstadt SG, Adachi T, Aksyutina Y, Alcantara J, Alvarez-Pol H, Ashwood N, Atar L, Aumann T, Avdeichikov V, Barr M, Beceiro S, Bemmerer D, Benlliure J, Bertulani CA, Boretzky K, Borge MJG, Burgunder G, Caamano M, Caesar C, Casarejos E, Catford W, Cederkäll J, Chakraborty S, Chartier M, Chulkov L, Cortina-Gil D, Datta Pramanik U, Diaz Fernandez P, Dillmann I, Elekes Z, Enders J, Ershova O, Estrade A, Farinon F, Fraile LM, Freer M, Freudenberger M, Fynbo HOU, Galaviz D, Geissel H, Gernhäuser R, Göbel K, Golubev P, Gonzalez Diaz D, Hagdahl J, Heftrich T, Heil M, Heine M, Heinz A, Henriques A, Holl M, Holt JD, Ickert G, Ignatov A, Jakobsson B, Johansson HT, Jonson B, Kalantar-Nayestanaki N, Kanungo R, Kelic-Heil A, Knöbel R, Kröll T, Krücken R, Kurcewicz J, Kurz N, Labiche M, Langer C, Le Bleis T, Lemmon R, Lepyoshkina O, Machado J, Marganiec J, Maroussov V, Menéndez J, Mostazo M, Movsesyan A, Najafi MA, Nilsson T, Nociforo C, Panin V, Perea A, Pietri S, Plag R, Prochazka A, Rahaman A, Rastrepina G, Reifarth R, Ribeiro G, Ricciardi MV, Rigollet C, Riisager K, Röder M, Rossi D (2014) 13,14B(n, ³) via Coulomb Dissociation for Nucleosynthesis towards the r-Process, Nuclear Data Sheets 120 pp. 197-200
Radioactive beams of 14,15B produced by fragmentation of a primary 40Ar beam were directed onto a Pb target to investigate the neutron breakup within the Coulomb field. The experiment was performed at the LAND/R3B setup. Preliminary results for the Coulomb dissociation cross sections as well as for the astrophysically interesting inverse reactions, 13,14B(n,³), are presented. © 2014 Elsevier Inc.
Brown TAD, Papka P, Fulton BR, Watson DL, Fox SP, Groombridge D, Freer M, Clarke NM, Ashwood NI, Curtis N, Ziman V, McEwan P, Ahmed S, Catford WN, Mahboub D, Timis CN, Baldwin TD, Weisser DC (2007) Decay studies for states in Be-9 up to 11 MeV: Insights into the n+Be-8 and alpha+He-5 cluster structure, PHYSICAL REVIEW C 76 (5) ARTN 054605 AMER PHYSICAL SOC
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, EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS 150 pp. 173-176 EDP SCIENCES S A
Lemmon RC, Fernandez-Dominguez B, Timis C, Labiche M, Catford WN, Chartier M, Ashwood N, Amzal N, Baldwin TD, Burns M, Caballero L, Chapman R, Curtis N, De France G, Freer M, Gelletly W, Liang X, Orr NA, Pain SD, Pucknell VPE, Rejmund M, Rubio B, Savajols H, Sorlin O, Spohr K, Thiesen C, Warner DD (2006) Studies of single-particle structure in the N=16 region using transfer reactions, AIP Conference Proceedings 853 pp. 285-290
We have developed a new experimental setup based at the GANIL/SPIRAL facility in Caen, France to measure one-nucleon transfer reactions in inverse kinematics in order to study the evolution of the single particle structure of exotic nuclei. The setup couples together three state-of-the-art detection systems: the TIARA Si array, the large-acceptance magnetic spectrometer VAMOS and the high-efficiency segmented Ge ³-ray array EXOGAM. In a first experiment, the 24Ne(d,p)25Ne reaction has been studied to probe the N=16 shell closure. Details of the setup, data analysis and preliminary results are presented. © 2006 American Institute of Physics.
Chakraborty S, Pramanik UD, Aumann T, Beceiro S, Boretzky K, Caesar C, Carlson BV, Catford WN, Chatterjee S, Chartier M, Cortina-Gil D, Angelis GD, Gonzalez-Diaz D, Emling H, Fernandez PD, Fraile LM, Ershova O, Geissel H, Heil M, Jonson B, Kelic A, Johansson H, Kruecken R, Kroll T, Kurcewicz J, Langer C, Bleis TL, Leifels Y, Munzenberg G, Marganiec J, Nociforo C, Najafi A, Panin V, Paschalis S, Pietri S, Plag R, Rahaman A, Reifarth R, Ricciardi V, Rossi D, Ray J, Simon H, Scheidenberger C, Typel S, Taylor J, Togano Y, Volkov V, Weick H, Wagner A, Wamers F, Weigand M, Winfield JS, Yakorev D, Zoric M (2014) Ground-state configuration of neutron-rich Aluminum isotopes through Coulomb breakup, EPJ Web of Conferences 66
Neutron-rich 34,35Al isotopes have been studied through Coulomb excitation using LAND-FRS setup at GSI, Darmstadt. The method of invariant mass analysis has been used to reconstruct the excitation energy of the nucleus prior to decay. Comparison of experimental CD cross-section with direct breakup model calculation with neutron in p3/2 orbital favours 34Al(g.s) - ½p3/2 as ground state configuration of 35Al. But ground state configuration of 34Al is complicated as evident from ³-ray spectra of 33Al after Coulomb breakup of 34Al. © Owned by the authors, published by EDP Sciences, 2014.
Curtis N, Achouri NL, Ashwood NI, Bohlen HG, Catford WN, Clarke NM, Freer M, Haigh PJ, Laurent B, Orr NA, Patterson NP, Soi? N, Thomas JS, Ziman V (2008) Structure of the brunnian nucleus 10C, Journal of Physics: Conference Series 111 (1)
Wilson GL, Catford WN, Diget CA, Orr NA, Adsley P, Al-Falou H, Ashley R, Austin RAE, Ball GC, Blackmon JC, Boston AJ, Boston HJ, Brown SM, Chen AA, Chen J, Churchman RM, Cross DS, Dech J, Djongolov M, Drake TE, Hager U, Fox SP, Fulton BR, Galinski N, Garnsworthy AB, Hackman G, Jamieson D, Kanungo R, Leach K, Martin J-P, Orce JN, Pearson CJ, Porter-Peden M, Sarazin F, Sjue S, Sumithrarachchi C, Svensson CE, Triambak S, Unsworth C, Wadsworth R, Williams SJ, 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) Towards Na-26 via (d,p) with SHARC and TIGRESS and a novel zero-degree detector, RUTHERFORD CENTENNIAL CONFERENCE ON NUCLEAR PHYSICS, 2011 381 IOP PUBLISHING LTD
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 38 (4) pp. 1255-1264 ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS
Haigh PJ, Freer M, Ashwood NI, Bloxham T, Curtis N, Bohlen HG, Dorsch T, Kokalova T, Wheldon C, Catford WN, Patterson NP, Thomas JS (2010) Alpha decay widths of excited states of O-16, JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS 37 (3) ARTN 035103 IOP PUBLISHING LTD
Beck C, Papka P, Sanchez i Zafra A, Thummerer S, Azaiez F, Bednarczyk P, Courtin S, Curien D, Dorvaux O, Lebhertz D, Nourreddine A, Rousseau M, von Oertzen W, Gebauer B, Wheldon C, Kokalova T, de Angelis G, Gadea A, Lenzi S, Szilner S, Napoli DR, Catford WN, Jenkins DG, Royer G (2009) Binary reaction decays from Mg-24+C-12, PHYSICAL REVIEW C 80 (3) ARTN 034604 AMER PHYSICAL SOC
Beck C, SÀnchez I Zafra A, Papka P, Thummerer S, Azaiez F, Bednarczyk P, Courtin S, Curien D, Dorvaux O, Lebhertz D, Nourreddine A, Robin J, Rousseau M, Von Oertzen W, Gebauer B, Kokalova T, Wheldon C, De Angelis G, Gadea A, Lenzi S, Szilner S, Napoli DR, Catford WN, Jenkins DG, Royer G (2008) Alpha-cluster states populated in 24Mg + 12C, International Journal of Modern Physics E 17 (10) pp. 2049-2054
Catford WN, Timis CN, Lemmon RC, Labiche M, Orr NA, Fernandez-Dominguez B, Chapman R, Freer M, Chartier M, Savajols H, Rejmund M, Achouri NL, Amzal N, Ashwood NI, Baldwin TD, Burns M, Caballero L, Casadjian JM, Curtis N, de France G, Gelletly W, Liang X, Pain SD, Pucknell VPE, Rubio B, Sorlin O, Spohr K, Theisen C, Warner DD (2010) Migration of Nuclear Shell Gaps Studied in the d(Ne-24, p gamma)Ne-25 Reaction, PHYSICAL REVIEW LETTERS 104 (19) ARTN 192501 AMER PHYSICAL SOC
Görgen A, Clément E, Korten W, Bouchez E, Chatillon A, Hüstel A, Le Coz Y, Theisen C, Wilson JN, Zielinska M, Andreoiu C, Becker F, Butler P, Casandjian JM, Catford WN, Czosnyka T, de France G, Gerl J, Herzberg RD, Iwanicki J, Jenkins DG, Jones GD, Napiorkowski PJ, Sletten G, Timis C (2007) Shape coexistence in 74Kr and 76Kr, European Physical Journal: Special Topics 150 (1) pp. 117-120
The coexistence of prolate and oblate shapes in the light krypton isotopes was investigated by Coulomb excitation of radioactive 74Kr and 76Kr beams at sub-barrier energies from the SPIRAL facility at GANIL. States up to the 8+ in the ground-state bandand several non-yrast states were populated in both cases via multi-step Coulomb excitation. A large set of both transitional and diagonal matrix elements was extracted from the measured differential Coulomb excitation cross sections. A complementary lifetime measurement using the recoil-distance Doppler shift method gave important constraints for the determination of the matrix elements. The signs of the quadrupole moments of the yrast and excited bands represent direct evidence for the coexistence of prolate and oblate shapes in both isotopes under study. The results are compared to recent configuration mixing calculations based on the generator coordinate method and Skyrme Hartree-Fock-Bogolyiubov mean-field states. © EDP Sciences/Societé Italiana di Fisica/Springer-Verlag 2007.
Curtis N, Ashwood NI, Freer M, Munoz-Britton T, Wheldon C, Ziman VA, Brown S, Catford WN, Patterson NP, Thomas JS, Weisser DC (2009) Search for the alpha + (6)He decay of (10)Be via the (16)O((18)O, (10)Be*)(24)Mg reaction, JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS 36 (1) ARTN 015108 IOP PUBLISHING LTD
Calinescu S, Caceres L, Grevy S, Sorlin O, Sohler D, Stanoiu M, Negoita F, Clement E, Astabatyan R, Borcea C, Borcea R, Bowry M, Catford W, Dombradi Z, Franchoo S, Garcia R, Gillibert R, Guerin H, Thomas JC, Kuti I, Lukyanov S, Lepailleur A, Maslov V, Morfouace P, Mrazek J, Niikura M, Perrot L, Podolyak Z, Petrone C, Penionzhkevich Y, Roger T, Rotaru F, Stefan I, Vajta Z, Wilson E (2014) STUDY OF THE NEUTRON-RICH ISOTOPE Ar-46 THROUGH INTERMEDIATE ENERGY COULOMB EXCITATION, ACTA PHYSICA POLONICA B 45 (2) pp. 199-204 WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO
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 38 (4) pp. 1265-1269 ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS
Summers NC, Pain SD, Orr NA, Catford WN, Angelique JC, Ashwood NI, Bouchat V, Clarke NM, Curtis N, Freer M, Fulton BR, Hanappe F, Labiche M, Lecouey JL, Lemmon RC, Mahboub D, Ninane A, Normand G, Nunes FM, Soic N, Stuttge L, Timis CN, Thompson IJ, Winfield JS, Ziman V (2007) B(E1) strengths from Coulomb excitation of Be-11, PHYSICS LETTERS B 650 (2-3) pp. 124-128 ELSEVIER SCIENCE BV
Heine M, Typel S, Wu M, Adachi T, Aksyutina Y, Alcantara J, Altstadt S, Alvarez-Pol H, Ashwood N, Aumann T, Avdeichikov V, Barr M, Beceiro-Novo S, Bemmerer D, Benlliure J, Bertulani C, Catford WN, Wilson G (2017) Determination of the Neutron-Capture Rate of 17C for the R-process Nucleosynthesis, Physical Review C: Nuclear Physics 95 (1) 014613 American Physical Society
With the R3B-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of 18C at a projectile energy around 425 AMeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of 17C into the ground state of 18C. Those data have been used to constrain theoretical calculations for transitions populating excited states in 18C. This allowed to derive the astrophysical cross section n accounting for the thermal population of 17C target states in astrophysical scenarios. The experimentally veri ed capture rate is signi cantly lower than those of previously obtained Hauser-Feshbach estimations at temperatures T9 1 GK. Network simulations with updated neutron-capture rates and hydrodynamics according to the neutrino-driven wind model as well as the neutron-star merger scenario reveal no pronounced in uence of neutron capture of 17C on the production of second- and third-peak elements in contrast to earlier sensitivity studies.
Wilson J, Lebois M, Qi L, Amador-Celdran P, Bleuel D, Briz J, Carroll R, Catford WN, De Witte H, Doherty D, Eloirdi R, Georgiev G, Gottardo A, Goasduff A, Hadynska-Klek K, Hauschild K, Hess M, Ingeberg V, Konstantinopoulos T, Ljungvall J, Lopez-Martens A, Lorusso G, Lozeva R, Lutter R, Marini P, Matea I, Materna T, Mathieu L, Oberstedt A, Oberstedt S, Panebianco S, Podolyak Z, Porta D, Regan PH, Reiter P, Rezynkina K, Rose S, Sahin E, Seidlitz M, Shearman R, Siebeck B, Siem S, Smith A, Tveten G, Verney D, Warr N, Zeiser F, Zielinska M (2017) PRODUCTION AND STUDY OF NEUTRON-RICH NUCLEI USING THE LICORNE DIRECTIONAL NEUTRON SOURCE, Acta Physica Polonica B 48 (3) pp. 395-401 Pan?stwowe Wydawn. Naukowe
We have recently successfully demonstrated a new technique for production and study of many of the most exotic neutron-rich nuclei at moderate spins. LICORNE, a newly developed directional inverse-kinematic fast neutron source at the IPN Orsay, was coupled to the MINIBALL high resolution -ray spectrometer to study nuclei the furthest from stability using the 238U(n; f) reaction. This reaction and 232Th(n; f) are the most neutron-rich fission production mechanisms achievable and can be used to simultaneously populate hundreds of neutron-rich nuclei up to spins of 16 ~. High selectivity in the experiment was achieved via triple -ray coincidences and the use of a 400 ns period pulsed neutron beam, a technique which is unavailable to other population mechanisms such as 235U(nth; f) and 252Cf(SF). The pulsing allows time correlations to be exploited to separate delayed rays from isomeric states in the hundreds of nuclei produced, which are then used to cleanly select a particular nucleus and its exotic binary partners. In the recent experiment, several physics cases are simultaneously addressed such as shape coexistence, the evolution of shell closures far from stability, and the spectroscopy of nuclei in the r-process path near N = 82. Preliminary physics results on anomalies in the 238U(n; f) fission yields and the structure of the 138Te and 100Sr nuclei will soon be published. A future project, -ball, to couple LICORNE with a hybrid escape-suppressed spectrometer to refine further the technique and achieve a large increase in the observational limit is discussed.
Rahaman A, Datta U, Aumann T, Beceiro-Novo S, Boretzky K, Caesar C, Carlson B, Catford W, Chakraborty S, Chartier M, Cortina-Gil D, De Angelis G, Diaz Fernandez P, Emling H (2017) Coulomb breakup of neutron-rich 29,30Na isotopes near the island of inversion, Journal of Physics G: Nuclear and Particle Physics 44 (4) 045101 Institute of Physics
First results are reported on the ground state configurations of the neutron-rich 29,30Na isotopes, obtained via Coulomb dissociation (CD) measurements. The invariant mass spectra of these nuclei have been obtained through measurement of the four-momenta of all decay products after Coulomb excitation of those nuclei on a 208Pb target at energies of 400-430 MeV/nucleon using the FRS-ALADIN-LAND setup at GSI, Darmstadt. Integrated inclusive Coulomb-dissociation cross-sections (CD) of 89 (7) mb and 167 (13) mb for one neutron removal from 29Na and 30Na, respectively, have been extracted up to an excitation energy of 10 MeV. The major part of one neutron removal, CD cross-sections of those nuclei populate the core, in its? ground state. A comparison with the direct breakup model, suggests the predominant occupation of the valence neutron in the ground state of 29Na(3/2+) and 30Na(2+) is the d-orbital with a small contribution from the s-orbital, which are coupled with the ground state of the core. One of the major components of the ground state configurations of these nuclei are 28Nags(1+) — ½s,d and 29Nags(3/2+) — ½s,d, respectively. The ground state spin and parity of these nuclei obtained from this experiment are in agreement with earlier reported values. The spectroscopic factors for the valence neutron occupying the s and d orbitals for these nuclei in the ground state have been extracted and reported for the first time. A comparison of the experimental findings with shell model calculation using the MCSM suggests a lower limit of around 4.3 MeV of the sd ? pf shell gap in 30Na.
Calinescu S, Caceres L, Grevy S, Sorlin O, Dombradi Z, Stanoiu M, Astabatyan R, Borcea C, Borcea R, Bowry M, Catford WN, Clement E, Franchoo S, Garcia R, Gillibert R, Guerin I, Kuti I, Lukyanov S, Lepailleur A, Maslov V, Morfouace P, Mrazek J, Negoita F, Niikura M, Perrot L, Podolyak Z, Petrone C, Penionzhkevich Y, Roger T, Rotaru F, Sohler D, Stefan I, Thomas J, Vajta Z, Wilson E (2016) Coulomb excitation of Ca-44 and Ar-46, PHYSICAL REVIEW C 93 (4) ARTN 04433 AMER PHYSICAL SOC
The reduced transition probabilities B(E2; 0+ g.s. ’ 2+ 1 ) of the 46Ar and 44Ca nuclei were studied using the Coulomb excitation technique at intermediate energy at the LISE/GANIL facility. The in-flight ³ rays, emitted after the Coulomb excitation of their first 2+ states, were detected in an array of 64 BaF2 crystals. The present B(E2 ‘) value for 44Ca, 475(36) e2fm4 , agrees well with the value of 495(35) e2fm4 obtained by averaging results of previous experiments. Consistent B(E2; 0+ g.s. ’ 2+ 1 ) values of 225(29) e2fm4 and 234(19) e2fm4 have been obtained for 46Ar from an absolute and a relative measurement, normalized to the 44Ca value. Both results agree with the ones obtained with the same experimental technique at the NSCL facility but are a factor of 2 smaller than the shell model predictions. The drop in B(E2; 0+ g.s. ’ 2+ 1 ) in the Ar chain at N = 28, confirmed in this experiment, shows that 46Ar is sensitive to the N = 28 shell closure.
Gurgi LA, Regan PH, Söderström P, Watanabe H, Walker PM, Podolyak Z, Nishimura S, Berry TA, Doornenbal P, Lorusso G, Isobe T, Baba H, Xu Z, Sakurai H, Sumikama T, Catford WN, Bruce A, Browne F, Lane G, Kondev F, Odahara A, Wu J, Liu H, Xu F, Korkulu Z, Lee P, Liu J, Phong V, Yagi A, Zhang G, Alharbi T, Carroll R, Chae K, Dombradi Z, Estrade A, Fukuda N, Griffin C, Ideguchi E, Inabe N, Kanaoka H, Kojouharov I, Kubo T, Kubono S, Kurz N, Kuti I, Lalkovski S, Lee E, Lee C, Lotay GJ, Moon C, Nishizuka I, Nita C, Patel Z, Roberts O, Schaffner H, Shand CM, Suzuki H, Takeda H, Terashima S, Vajta Z, Kanaya S, Valiente-Dobón J (2017) Isomer Spectroscopy of Neutron-rich 165,167Tb, Acta Physica Polonica B 48 (3) pp. 601-608
We present information on the excited states in the prolate-deformed, neutron-rich nuclei 165;167Tb100;102. The nuclei of interest were synthesised following in-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm 9Be target at the Radioactive Ion-Beam Factory (RIBF), RIKEN, Japan. The exotic nuclei were separated and identified event-by-event using the BigRIPS separator, with discrete energy gamma-ray decays from isomeric states with half-lives in the s regime measured using the EURICA gamma-ray spectrometer. Metastable-state decays are identified in 165Tb and 167Tb and interpreted as arising from hindered E1 decay from the 7 2 [523] single quasi-proton Nilsson configuration to rotational states built on the 3 2 [411] single quasi-proton ground state. These data correspond to the first spectroscopic information in the heaviest, odd-A terbium isotopes reported to date and provide information on proton Nilsson configurations which reside close to the Fermi surface as the 170Dy doubly-midshell nucleus is approached.
Gurgi L, Regan P, Söderström P, Watanabe H, Walker P, Podolyak Z, Nishimura S, Berry T, Doornenbal P, Lorusso G, Isobe T, Baba H, Xu Z, Sakurai H, Sumikama T, Catford W, Bruce A, Browne F, Lane G, Kondev F, Odahara A, Wu J, Liu H, Xu F, Korkulu Z, Lee P, Liu J, Phong V, Yag A, Zhang G, Alharbi T, Carroll R, Chae K, Dombradi Z, Estrade A, Fukuda N, Griffin C, Ideguchi E, Inabe N, Kanaoka H, Kojouharov I, Kubo T, Kubono S, Kurz N, Kuti I, Lalkovski S, Lee E, Lee C, Lotay G, Moon C, Nishizuka I, Nita C, Patel Z, Roberts O, Schaffner H, Shand C, Suzuki H, Takeda H, Terashima S, Vajta Z, Yoshida S, Valiente-Dòbon J (2016) Isomer spectroscopy of neutron-rich 168Tb103, Radiation Physics and Chemistry 140 pp. 493-496 Elsevier
In-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm thick 9Be target has been used to
produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus
170Dy at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified eventby-
event using the BigRIPS separator. The fragments were implanted into the WAS3ABI position sensitive
silicon active stopper which allowed pixelated correlations between implants and their subsequent ²-decay.
Discrete ³-ray transitions emitted following decays from either metastable states or excited states populated
following beta decay were identified using the 84 coaxial high-purity germanium (HPGe) detectors of the
EURICA spectrometer, which was complemented by 18 additional cerium-doped lanthanum bromide (LaBr3)
The structure of 25Na is studied using the (d, p) transfer reaction using the ISAC-II accelerator at TRIUMF, Canada. An 8 MeV per nucleon beam of 24Na, incident onto a 1.0 mg CD2 target was used to populate excited states in 25Na. The target was surrounded by the SHARC and TIGRESS arrays, which were used to detect the ejected protons, and coincident gamma-rays emitted from the excited 25Na nuclei respectively. The angular distribution of the protons has been analysed for each state observed and compared to the theoretical distributions generated using TWOFNR to get a value of the spectroscopic factors. Data were compared to WBC shell-model calculations in order to assign spin and parities to each observed state. States at 2.788 MeV and 3.455 MeV are strongly populated and show a strong s-wave contribution to the wave functions.

In addition, the structure of the astrophysically relevant mirror nucleus 25Si is commented
on. The reaction 24Al(p, gamma)25Si reaction is thought to occur in hot stellar environments, but little to no experimental data exist that confirm reaction rates calculated for this reaction. The spectroscopic factors found in this work for 25Na are used as a point of comparison and used to determine the validity of theoretical reaction rate calculations used for the astrophysical reaction. The relevant energy region in the reaction 24Al(p, gamma)25Si is between the proton separation energy of 3.414 and 4 MeV. Two states
are observed in this energy range in 25Na at 3.455 and 3.995 MeV, though the 3.455 MeV state is expected to be Thomas-Ehrman shifted below the 3.414 MeV threshold in
the mirror 25Si. The state at 3.995 MeV was found to have an s-wave component that matched the predicted value from literature. No other states were observed within the
relevant energy region in 25Na.

Jentschel M, Blanc A, de France G, Köster U, Leoni S, Mutti P, Simpson G, Soldner T, Ur C, Urban W, Ahmed S, Astier A, Augey L, Back T, Ba'czyk P, Bajoga A, Balabanski D, Belgya T, Benzoni G, Bernards C, Biswas D, Bocchi G, Bottoni S, Britton R, Bruyneel B, Burnett J, Cakirli R, Carroll R, Catford W, Cederwall B, Celikovic I, Cieplicka-OryDczak N, Clement E, Cooper N, Crespi F, Csatlos M, Curien D, CzerwiDski M, Danu L, Davies A, Didierjean F, Drouet F, Duchêne G, Ducoin C, Eberhardt K, Erturk S, Fraile L, Gottardo A, Grente L, Grocutt L, Guerrero C, Guinet D, Hartig A, Henrich C, Ignatov A, Ilieva S, Ivanova D, John B, John R, Jolie J, Kisyov S, Krticka M, Konstantinopoulos T, Korgul A, Krasznahorkay A, Kröll T, Kurpeta J, Kuti I, Lalkovski S, Larijani C, Leguillon R, Lica R, Litaize O, Lozeva R, Magron C, Mancuso C, Martinez E, Massarczyk R, Mazzocchi C, Melon B, Mengoni D, Michelagnoli C, Million B, Mokry C, Mukhopadhyay S, Mulholland K, Nannini A, Napoli D, Olaizola B, Orlandi R, Patel Z, Paziy V, Petrache C, Pfeiffer M, Pietralla N, Podolyak Z, Ramdhane M, Redon N, Regan P, Regis J, Regnier D, Oliver R, Rudigier M, Runke J, Rza'ca-Urban T, Saed-Samii N, Salsac M, Scheck M, Schwengner R, Sengele L, Singh P, Smith J, Stezowski O, Szpak B, Thomas T, Thürauf M, Timar J, Tom A, Tomandl I, Tornyi T, Townsley C, Tuerler A, Valenta S, Vancraeyenest A, Vandone V, Vanhoy J, Vedia V, Warr N, Werner V, Wilmsen D, Wilson E, Zerrouki T, Zielinska M (2017) EXILL?a high-efficiency, high-resolution setup for ³-spectroscopy at an intense cold neutron beam facility, Journal of Instrumentation 12 (11) pp. P11003-P11003 IOP Publishing
In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of ³-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 108 n s?1cm?2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM Clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectors were arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 × 105 Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico- to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of 133Ba, 60Co and 152Eu as well as data from the reactions 27Al(n,³)28Al and 35Cl(n,³)36Cl in the energy range from 30 keV up to 10 MeV.
Fernández-Domínguez B, Pietras B, Catford W, Orr N, Petri M, Chartier M, Paschalis S, Patterson N, Thomas J, Caamaño M, Otsuka T, Poves A, Tsunoda N, Achouri N, Angélique J, Ashwood N, Banu A, Bastin B, Borcea R, Brown J, Delaunay F, Franchoo S, Freer M, Gaudefroy L, Heil S, Labiche M, Laurent B, Lemmon R, Macchiavelli A, Negoita F, Paul E, Rodríguez-Tajes C, Roussel-Chomaz P, Staniou M, Taylor M, Trache L, Wilson G (2018) Re-examining the transition into the N = 20 island of inversion: Structure of 30 Mg, Physics Letters B 779 pp. 124-129 Elsevier
Intermediate energy single-neutron removal from 31Mg has been employed to investigate the transition
into the N = 20 island of inversion. Levels up to 5 MeV excitation energy in 30Mg were populated and
spin-parity assignments were inferred from the corresponding longitudinal momentum distributions and
³ -ray decay scheme. Comparison with eikonal-model calculations also permitted spectroscopic factors
to be deduced. Surprisingly, the 0+
2 level in 30Mg was found to have a strength much weaker than
expected in the conventional picture of a predominantly 2p?2h intruder configuration having a large
overlap with the deformed 31Mg ground state. In addition, negative parity levels were identified for the
first time in 30Mg, one of which is located at low excitation energy. The results are discussed in the
light of shell-model calculations employing two newly developed approaches with markedly different
descriptions of the structure of 30Mg. It is concluded that the cross-shell effects in the region of the
island of inversion at Z = 12 are considerably more complex than previously thought and that np?nh
configurations play a major role in the structure of 30Mg.
Christian G, Lotay G, Ruiz C, Akers C, Burke D, Catford W, Chen A, Connolly D, Davids B, Fallis J, Hager U, Hutcheon D, Mahl A, Rojas A, Sun X (2018) Direct measurement of astrophysically important resonances in 38K( p,³ )39Ca, Physical Review C 97 (2) 025802 American Physical Society
Background:

Classical novae are cataclysmic nuclear explosions occurring when a white dwarf in a binary system accretes hydrogen-rich material from its companion star. Novae are partially responsible for the galactic synthesis of a variety of nuclides up to the calcium (
A
40
) region of the nuclear chart. Although the structure and dynamics of novae are thought to be relatively well understood, the predicted abundances of elements near the nucleosynthesis endpoint, in particular Ar and Ca, appear to sometimes be in disagreement with astronomical observations of the spectra of nova ejecta.

Purpose:

One possible source of the discrepancies between model predictions and astronomical observations is nuclear reaction data. Most reaction rates near the nova endpoint are estimated only from statistical model calculations, which carry large uncertainties. For certain key reactions, these rate uncertainties translate into large uncertainties in nucleosynthesis predictions. In particular, the
38
K
(
p
,
³
)
39
Ca
reaction has been identified as having a significant influence on Ar, K, and Ca production. In order to constrain the rate of this reaction, we have performed a direct measurement of the strengths of three candidate
?
=
0
resonances within the Gamow window for nova burning, at
386
±
10
keV,
515
±
10
keV, and
689
±
10
keV.

Method:

The experiment was performed in inverse kinematics using a beam of unstable
38
K
impinged on a windowless hydrogen gas target. The
39
Ca
recoils and prompt
³
rays from
38
K
(
p
,
³
)
39
Ca
reactions were detected in coincidence using a recoil mass separator and a bismuth-germanate scintillator array, respectively.

Results:

For the 689 keV resonance, we observed a clear recoil-
³
coincidence signal and extracted resonance strength and energy values of
120
+
50
?
30
(
stat
.
)
+
20
?
60
(
sys
.
)
meV
and
679
+
2
?
1
(
stat
.
)
±
1
(
sys
.
)
keV
, respectively. We also performed a singles analysis of the recoil data alone, extracting a resonance strength of
120
±
20
(
stat
.
)
±
15
(
sys
.
)
meV, consistent with the coincidence result. For the 386 keV and 515 keV resonances, we extract
90
%
confidence level upper limits of 2.54 meV and 18.4 meV, respectively.

Conclusions:

We have established a new recommended
38
K
(
p
,
³
)
39
Ca
rate based on experimental information, which reduces overall uncertainties near the peak temperatures of nova burning by a factor of
250
. Using the rate obtained in this work in model calculations of the hottest oxygen-neon novae reduces overall uncertainties on Ar, K, and Ca synthesis to factors of 15 or less in all cases.

Atar L, Paschalis S, Barbieri C, Bertulani C, Díaz Fernández P, Hollington M, Najafi M, Panin V, Alvarez-Pol H, Aumann T, Avdeichikov V, Beceiro-Novo S, Bemmerer D, Benlliure J, Boillos J, Boretzky K, Borge M, Caamaño M, Caesar C, Casarejos E, Catford W, Cederkall J, Chartier M, Chulkov L, Cortina-Gil D, Cravo E, Crespo R, Dillmann I, Elekes Z, Enders J, Ershova O, Estrade A, Farinon F, Fraile L, Freer M, Galaviz Redondo D, Geissel H, Gernhäuser R, Golubev P, Göbel K, Hagdahl J, Heftrich T, Heil M, Heine M, Heinz A, Henriques A, Hufnagel A, Ignatov A, Johansson H, Jonson B, Kahlbow J, Kalantar-Nayestanaki N, Kanungo R, Kelic-Heil A, Knyazev A, Kröll T, Kurz N, Labiche M, Langer C, Le Bleis T, Lemmon R, Lindberg S, Machado J, Marganiec-GaB?zka J, Movsesyan A, Nacher E, Nikolskii E, Nilsson T, Nociforo C, Perea A, Petri M, Pietri S, Plag R, Reifarth R, Ribeiro G, Rigollet C, Rossi D, Röder M, Savran D, Scheit H, Simon H, Sorlin O, Syndikus I, Taylor J, Tengblad O, Thies R, Togano Y, Vandebrouck M, Velho P, Volkov V, Wagner A, Wamers F, Weick H, Wheldon C, Wilson G, Winfield J, Woods P, Yakorev D, Zhukov M, Zilges A, Zuber K (2018) Quasifree ( p , 2p ) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength, Physical Review Letters 120 (5) 052501 American Physical Society
Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic
study of the structure of stable and exotic oxygen isotopes at the R3B=LAND setup with incident beam
energies in the range of 300?450 MeV=u. The oxygen isotopic chain offers a large variation of separation
energies that allows for a quantitative understanding of single-particle strength with changing isospin
asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy onenucleon
removal reactions. Inclusive cross sections for quasifree knockout reactions of the type
AOðp; 2pÞA?1N have been determined and compared to calculations based on the eikonal reaction theory.
The reduction factors for the single-particle strength with respect to the independent-particle model were
obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant
dependence on proton-neutron asymmetry.
Orlandi R, Pain SD, Ahn S, Jungclaus A, Schmitt KT, Bardayan DW, Catford Wilton, Chapman R, Chipps KA, Cizewski JA, Gross CG, Howard ME, Jones KL, Kozub RL, Manning B, Matos M, Nishio K, O? Malley PD, Peters WA, Pittman ST, Ratkiewicz A, Shand Callum, Smith JF, Smith MS, Fukui T, Tostevin Jeffrey, Utsuno Y (2018) Neutron-hole states in 131Sn and spin-orbit splitting in neutron-rich nuclei, Physics Letters B Elsevier
In atomic nuclei, the spin-orbit interaction originates from the coupling of the orbital motion of a nucleon with its intrinsic spin.
Recent experimental and theoretical works have suggested a weakening of the spin-orbit interaction in neutron-rich nuclei far from
stability. To study this phenomenon, we have investigated the spin-orbit energy splittings of single-hole and single-particle valence
neutron orbits of 132Sn. The spectroscopic strength of single-hole states in 131Sn was determined from the measured differential
cross sections of the tritons from the neutron-removing 132Sn(d,t)131Sn reaction, which was studied in inverse kinematics at the
Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. The spectroscopic factors of the lowest 3=2+, 1=2+
and 5=2+states were found to be (2 j+1), confirming the robust N = 82 shell closure at 132Sn. We compared the spin-orbit
splitting of neutron single-hole states in 131Sn to those of single-particle states in 133Sn determined in a recent measurement of the
132Sn(d,p)133Sn reaction. We found a significant reduction of the energy splitting of the weakly bound 3p orbits compared to the
well-bound 2d orbits, and that all the observed energy splittings can be reproduced remarkably well by calculations using a onebody
spin-orbit interaction and a Woods-Saxon potential of standard radius and diffuseness. The observed reduction of spin-orbit
splitting can be explained by the extended radial wavefunctions of the weakly bound orbits, without invoking a weakening of the
spin-orbit strength.