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Professor Patrick Regan

DPhil FInstP

Academic and research departments

Centre for Nuclear and Radiation Physics.



Paddy Regan joined the academic staff in the Physics Department at Surrey in 1994 after holding postdoctoral research positions at the University of Pennsylvania, USA and the Australian National University in Canberra. He was subsequently promoted to Senior Lecturer (2002), Reader (2005) and a Personal Chair in Experimental Nuclear Physics (2009). Since 2013, he has held the NPL-Surrey Chair in Radionuclide Metrology and is part-based within the Radioactivity Group at the National Physical Laboratory in Teddington where he is the Science Area Leader. Paddy was elected a Fellow of the Institute of Physics in 2000. He has held Visiting Research positions at the Wright Nuclear Structure Laboratory, Yale University (2002-2013) and served as an Adjunct Professor at the University of Notre Dame (London Programme) (2002-2013). From 2001 until 2010, he was the Collaboration Spokesperson for the Stopped RISING Collaboration which studied the internal structure of exotic forms of atomic nuclei following either metastable state or beta-decay. He has served as the Chair of the GSI Users Executive Committee (2009), as a member of the Science and Technologies Facilities Council Education, Training and Careers Committee (2007-2011) and Chair of the South African National Research Foundation Review Committee on Nuclear Physics (2015). He was the Chair of the PreSPEC International Steering Committee, which oversees the experimental programme for nuclear structure physics at GSI/FAIR and was an elected member of the NuSTAR Board for the FAIR project in Darmstadt, Germany (2008-2012). He is currently a member of the International Scientific Advisory Committee for the Radioactive Isotope Science Project in Daejeon, South Korea and also serves on the Programme Advisory Committee for the Institute of Nuclear Physics Laboratory, in Orsay, Paris, France.He has successfully supervised more than 30 PhD students and over 100 MSc research dissertation projects to completion to date. He has co-authored more than 280 peer-reviewed scientific papers on nuclear physics and radiation detection/instrumentation research and given more than 100 invited international conference and workshop presentations on his research. He also pursues research into measurements of naturally occurring radioactive materials (NORM) in the environment using applications of the gamma-ray spectroscopic techniques he uses in his more fundamental research projects. He is also regularly engaged by the TV, radio and written press media on issues related to radiation and nuclear physics. In this capacity he has made over 100 mainstream TV and radio appearances on issues related to radiation physics in the last three years. In his spare time Paddy plays a poor game golf and likes to walk the family dog.

Research interests

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

Research collaborations

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

Further details can be found on my personal web page.

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


Paddy currently teaches the following courses within the department:

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

Since 2000, he has also taught the following courses:

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

Departmental duties

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

My publications


Spectroscopy of the Neutron-rich 168,170Dy: Yrast band evolution close to the Np.Nn valence maximum. P.A.Soederstrom, J.Nyberg, P.H. Regan et al., Phys. Rev. C81, 034310 (2010)

Nuclear structure 'southeast' of 208Pb: Isomeric States in 208Hg and 209Tl. N.Al-Dahan, Zs.Podolyak, P.H.Regan et al., Phys. Rev. C80, 061302 (2009)

Beta-delayed gamma-ray spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes. N.Alkhomashi, P.H.Regan, Zs.Podolyak et al., Phys. Rev. C80, 064308 (2009)

Isomeric states in neutron-deficient A=80-90 nuclei populated in the fragmentation of 107Ag. A.B.Garnsworthy, P.H.Regan, S.Pietri et al., Phys. Rev. C80, 064303 (2009)

Proton-hole excitation in the closed shell nucleus 205Au, Zs. Podolyak, G.F.Farrelly, P.H.Regan et al., Phys. Lett. B672, 116 (2009)

Neutron-proton pairing competition in N=Z nuclei: Metastable state decays in the proton dripline nuclei 82Nb and 86Tc, A.B. Garnsworthy, P.H.Regan, L.Caceres, S.Pietri et al., Phys. Lett. B606, 246 (2008)

Intrinsic state lifetimes in 103Pd and 106, 107Cd , S.F.Ashley, P.H.Regan, et al., Phys.Rev. C76, 064302 (2007)

Identification of a high-spin isomer in 99Mo, G.A.Jones, P.H.Regan, P.M.Walker et al., Phys.Rev. C76, 047303 (2007)

Yrast studies of 80,82Se using deep-inelastic reactions, G.A.Jones, P.H.Regan, Zs.Podolyak, N.Yoshinaga et al., Phys.Rev. C76, 054317 (2007)

Observation of Isomeric Decays in the r-Process Waiting-Point Nucleus 130Cd82 , A.Jungclaus, L.Caceres, M.Gorska, M.Pfutzner, S.Pietri, .., Z.Podolyak, P.H.Regan, et al., , Phys.Rev.Lett. 99, 132501 (2007)

Recent results in fragmentation isomer spectroscopy with RISING, S.Pietri, P.H.Regan, Zs.Podolyak, D.Rudolph, S.Steer, A.B.Garnsworthy, et al., Nucl. Instrum. Methods Phys.Res. B261, 1079 (2007)

Isomer Spectroscopy Using Relativistic Projectile Fragmentation at the N=Z Line for A ∼ 80 → 90, P.H.Regan, A.B.Garnsworthy, S.Pietri et al., Nucl. Phys. A787, 491c (2007)

Isomers in neutron-rich A ≈ 190 nuclides from 208Pb fragmentation, M.Caamano, P.M.Walker, P.H.Regan, M.Pfutzner et al., Eur. Phys. J. A23, 201 (2005)

Observation of an isomeric state in 197Au, C.Wheldon, J.J.Valiente-Dobon, P.H.Regan, C.J.Pearson et al., Phys. Rev. C74, 027303 (2006)

Angular momentum population in the projectile fragmentation of 238U at 750 MeV/nucleon, K.A.Gladnishki, Zs.Podolyak, P.H.Regan, J.Gerl et al., Phys.Rev. C69, 024617 (2004)

Production of exotic nuclear isomers in multi-nucleon transfer reactions , P.H.Regan, J.J.Valiente-Dobon, C.Wheldon et al., Laser Phys.Lett. 1, 317 (2004)

136Ba studied via deep-inelastic collisions: Identification of the (νh11/2)-210+ isomer, J.J.Valiente-Dobon, P.H.Regan, C.Wheldon, Phys.Rev. C69, 024316 (2004)

Multi-quasiparticle states in 184W via multi-nucleon transfer , C.Wheldon, J.J.Valiente-Dobon, P.H.Regan, C.J.Pearson et al., Eur. Phys. J. A20, 365 (2004)

Signature for Vibrational to Rotational Evolution Along the Yrast Line, P.H.Regan, C.W.Beausang, N.V.Zamfir, R.F.Casten et al., Phys.Rev.Lett. 90, 152502 (2003)

Binary-reaction spectroscopy of 99, 100Mo: Intruder alignment systematics in N = 57 and N = 58 isotones, P.H.Regan, A.D.Yamamoto, F.R.Xu et al., Phys. Rev. C68, 044313 (2003)

Angular Momentum Population in the Fragmentation of 208Pb at 1 GeV/nucleon M.Pfutzner, P.H.Regan, P.M.Walker et al., Phys.Rev. C65, 064604 (2002)

Structure of the Doubly Midshell Nucleus 66170Dy104' P.H.Regan, F.R.Xu, P.M.Walker et al., Phys. Rev. C65, 037302 (2002)

High-j proton and neutron alignments in γ-soft 101Ru, A.D.Yamamoto, P.H.Regan, C.W.Beausang, et al., Phys.Rev. C66, 024302 (2002)

Fermi Superallowed β+ Decays and T = 1 Ground States of Heavy Odd-Odd N = Z Nuclei, J.Garces Narro, C.Longour, P.H.Regan, B.Blank et al., Phys.Rev. C63, 044307 (2001)

Observation of Isomeric States in Neutron Deficient A ∼ 80 Nuclei following the Projectile Fragmentation of 92Mo, C.Chandler, P.H.Regan, B.Blank et al., Phys.Rev. C61, 044309 (2000)

Isomer Spectroscopy of Neutron Rich 190W116 , Zs.Podolyak, P.H.Regan, M.Pfutzner et al., Phys.Lett. 491B, 225 (2000)

Observation of the Z = N + 1 Nuclei 3977Y, 4079Zr, and 4283Mo, Z.Janas, C.Chandler, B.Blank, P.H.Regan et al., Phys. Rev. Lett. 82, 295 (1999)

Near Yrast Study of the fpg Shell Nuclei 58Ni, 61Cu, and 61Zn, S.M.Vincent, P.H.Regan, S.Mohammadi, et al., Phys.Rev. C60, 064308 (1999)

Competing T = 0 and T = 1 Structures in the N = Z Nucleus 3162Ga, S.M.Vincent, P.H.Regan, D.D.Warner et al., Phys.Lett. 437B, 264 (1998)

Evidence for a Highly Deformed Oblate 0+ State in 3674Kr, C.Chandler, P.H.Regan, C.J.Pearson et al., Phys.Rev. C56, R2924 (1997)