Dr Paul Stevenson
Senior Lecturer
Qualifications: MA (Oxon) D.Phil. (Oxon) CSci MInstP FHEA
Email: p.stevenson@surrey.ac.uk
Phone: Work: 01483 68 6796
Room no: 12 BB 03
Further information
Biography
Paul was born in Glasgow on the day President Nixon announced his resignation. He grew up in Glasgow, Bristol, London and Bishop's Stortford. After graduating from the University of Oxford in 1999 with a D.Phil in theoretical nuclear structure physics he spent a year as a Postdoctoral Research Associate at the University of Tennessee in Knoxville. From there he was appointed as a Research Fellow at Surrey, a job he held for two years, which was followed by being appointed a Lecturer in 2002, and a Senior Lecturer in 2008. He is the chair of the Physics Department Board of Studies and deputy warden of International House and Twyford Court
Research Interests
Paul's research centres around the solution of the quantum-mechanical many-body problem. Mostly this is applied in the case of atomic nuclei, but he has also looked at metal clusters, Bose-Einstein condensates and neutron stars, where similar techniques to those used in nuclear problems may be applied. In the nuclear case he has developed a new approach for going beyond the mean-field approximation based on perturbation theory. Currently he is looking at time-dependent solutions of the Hartree-Fock equations and the connection with the Random-Phase Approximation. In addition, he supports experimentalists at Surrey and elsewhere by applying a variety of models to look at experimental results to help in their interpretation and also in evaluation of the models.
He is also intrerested in the foundations of quantum mechanics and econo- and socio-physics
Research Collaborations
Paul is involved with collaborations with many of the experimental nuclear physics groups in UK universities, and additionally with physicists from Beijing (China), Frankfurt and Erlangen (Germany), and Oak Ridge (USA).
Publications
Highlights
- . (2010) 'Discovery of W-157 and Os-161'. ELSEVIER SCIENCE BV PHYSICS LETTERS B, 690 (1), pp. 15-18.
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(2010) 'Extracting structure information from TDHF'. IOP PUBLISHING LTD J PHYS G NUCL PARTIC, 37 (6) Article number 064030 Full text is available at: http://epubs.surrey.ac.uk/7357/
- . (2010) 'The effect of the tensor force on the predicted stability of superheavy nuclei'. EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY EPL, 90 (1) Article number ARTN 12001
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(2008) 'Mass dispersions from giant dipole resonances using the Balian-Veneroni variational approach'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 35 (9) Article number ARTN 095102 Full text is available at: http://epubs.surrey.ac.uk/120/
Journal articles
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(2012) 'The tensor-kinetic field in nuclear collisions'. Institute of Physics Journal of Physics: Conference Series, 381 Article number 1 , pp. 012105-012105.Full text is available at: http://epubs.surrey.ac.uk/732927/
Abstract
The role of the tensor terms in the Skyrme interaction is studied for their effect in dynamic calculations where non-zero contributions to the mean-field may arise, even when the starting nucleus, or nuclei are even-even and have no active time-odd potentials in the ground state. We study collisions in the test-bed 16 O- 16 O system, and give a qualitative analysis of the behaviour of the time-odd tensor-kinetic density, which only appears in the mean field Hamiltonian in the presence of the tensor force. We find an axial excitation of this density is induced by a collision.
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(2012) 'Single-particle dissipation in a time-dependent Hartree-Fock approach studied from a phase-space perspective'. AMER PHYSICAL SOC PHYSICAL REVIEW C, 86 (2) Article number ARTN 024608 Full text is available at: http://epubs.surrey.ac.uk/732925/
- . (2012) 'Unrestricted Skyrme-tensor time-dependent Hartree-Fock model and its application to the nuclear response from spherical to triaxial nuclei'. Physical Review C - Nuclear Physics, 86 (4)
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(2012) 'Skyrme interaction and nuclear matter constraints'. American Physical Society PHYSICAL REVIEW C, 85 (3) Article number 035201 Full text is available at: http://epubs.surrey.ac.uk/711377/
Abstract
This paper presents a detailed assessment of the ability of the 240 Skyrme interaction parameter sets in the literature to satisfy a series of criteria derived from macroscopic properties of nuclear matter in the vicinity of nuclear saturation density at zero temperature and their density dependence, derived by the liquid-drop model, in experiments with giant resonances and heavy-ion collisions. The objective is to identify those parametrizations which best satisfy the current understanding of the physics of nuclear matter over a wide range of applications. Out of the 240 models, only 16 are shown to satisfy all these constraints. Additional, more microscopic, constraints on the density dependence of the neutron and proton effective mass β-equilibrium matter, Landau parameters of symmetric and pure neutron nuclear matter, and observational data on high- and low-mass cold neutron stars further reduce this number to 5, a very small group of recommended Skyrme parametrizations to be used in future applications of the Skyrme interaction of nuclear-matter-related observables. Full information on partial fulfillment of individual constraints by all Skyrme models considered is given. The results are discussed in terms of the physical interpretation of the Skyrme interaction and the validity of its use in mean-field models. Future work on application of the Skyrme forces, selected on the basis of variables of nuclear matter, in the Hartree-Fock calculation of properties of finite nuclei, is outlined.
- . (2012) 'Multiple β Decaying states in 194Re: Shape evolution in neutron-rich osmium isotopes'. Physical Review C - Nuclear Physics, 85 (3)
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(2012) 'Multiple β - Decaying states in 194Re: Shape evolution in neutron-rich osmium isotopes'. American Physical Society Physical Review C - Nuclear Physics, 85 (3) Article number 034301 Full text is available at: http://epubs.surrey.ac.uk/532653/
Abstract
decays from heavy, neutron-rich nuclei with A∼190 have been investigated following their production via the relativistic projectile fragmentation of an E/A=1 GeV 208Pb primary beam on a ∼2.5 g/cm2 9Be target. The reaction products were separated and identified using the GSI FRagment Separator (FRS) and stopped in the RISING active stopper. γ decays were observed and correlated with these secondary ions on an event-by-event basis such that γ-ray transitions following from both internal (isomeric) and β decays were recorded. A number of discrete, β-delayed γ-ray transitions associated with β decays from 194Re to excited states in 194Os have been observed, including previously reported decays from the yrast Iπ=(6+) state. Three previously unreported γ-ray transitions with energies 194, 349, and 554 keV are also identified; these transitions are associated with decays from higher spin states in 194Os. The results of these investigations are compared with theoretical predictions from Nilsson multi-quasiparticle (MQP) calculations. Based on lifetime measurements and the observed feeding pattern to states in 194Os, it is concluded that there are three β−-decaying states in 194Re.
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(2011) 'Spectroscopic calculations of the low-lying structure in exotic Os and W isotopes'. AMER PHYSICAL SOC PHYSICAL REVIEW C, 83 (5) Article number ARTN 054303 Full text is available at: http://epubs.surrey.ac.uk/7773/
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(2011) 'Nuclear charge radii and electromagnetic moments of radioactive scandium isotopes and isomers'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 38 (2) Article number ARTN 025104 Full text is available at: http://epubs.surrey.ac.uk/7774/
- . (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.
- . (2011) 'The electron-ion 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.
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(2010) 'The influence of the symmetry energy on the giant monopole resonance of neutron-rich nuclei analyzed in Thomas-Fermi theory'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 37 (7) Article number ARTN 075107 Full text is available at: http://epubs.surrey.ac.uk/728047/
- . (2010) 'Discovery of W-157 and Os-161'. ELSEVIER SCIENCE BV PHYSICS LETTERS B, 690 (1), pp. 15-18.
- .
(2010) 'Extracting structure information from TDHF'. IOP PUBLISHING LTD J PHYS G NUCL PARTIC, 37 (6) Article number 064030 Full text is available at: http://epubs.surrey.ac.uk/7357/
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(2010) 'Configuration dependence of K-forbidden transition rates from three-quasiparticle isomers'. AMER PHYSICAL SOC PHYSICAL REVIEW C, 81 (4) Article number ARTN 041304 Full text is available at: http://epubs.surrey.ac.uk/7506/
- . (2010) 'The effect of the tensor force on the predicted stability of superheavy nuclei'. EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY EPL, 90 (1) Article number ARTN 12001
- . (2010) 'Discovery of 157W and 161Os'. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 690 (1), pp. 15-18.
- . (2010) 'Testing a Variational Method for Fluctuations'. IOP PUBLISHING LTD XVIII INTERNATIONAL SCHOOL ON NUCLEAR PHYSICS, NEUTRON PHYSICS AND APPLICATIONS, Varna, BULGARIA: 205 Article number ARTN 012027
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(2008) 'Mass dispersions from giant dipole resonances using the Balian-Veneroni variational approach'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 35 (9) Article number ARTN 095102 Full text is available at: http://epubs.surrey.ac.uk/120/
- . (2008) 'Fission of hyper-hyperdeformed (56)Ni: a clustering analysis within mean-field approaches'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 35 (7) Article number ARTN 075106
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(2008) 'Simulating the Quantum Zeno and Anti-Zeno Effects During Position Measurements'. AMER SCIENTIFIC PUBLISHERS ADVANCED SCIENCE LETTERS, 1 (1), pp. 140-144.doi: 10.1166/asl.2008.009
- . (2008) 'First results with the rising active stopper'. International Journal of Modern Physics E, 17 (SUPPL. 1), pp. 8-20.
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(2007) 'Identification of a high-spin isomer in (99)Mo'. AMER PHYSICAL SOC PHYSICAL REVIEW C, 76 (4) Article number ARTN 047303 Full text is available at: http://epubs.surrey.ac.uk/711994/
- . (2007) 'Exotic clustering in heavy and superheavy nuclei within the relativistic and non-relativistic mean field formalisms'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 34 (9), pp. 2073-2090.
- . (2007) 'A highly neutron-rich cluster and/or a superheavy nucleus in the compound nucleus U-238+U-238: A mean field study'. WORLD SCIENTIFIC PUBL CO PTE LTD INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS, 16 (6), pp. 1721-1732.
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(2007) 'alpha decay of Re-159 and proton emission from Ta-155'. AMERICAN PHYSICAL SOC PHYSICAL REVIEW C, 75 (6) Article number ARTN 061302 Full text is available at: http://epubs.surrey.ac.uk/147/
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(2007) 'Monopole Giant Resonances and TDHF boundary conditions'. Elsevier Nuclear Physics A, 788, pp. 343-348.Full text is available at: http://epubs.surrey.ac.uk/161476/
- . (2007) 'Monopole Giant Resonances and TDHF boundary conditions'. Nuclear Physics A, 788 (1-4), pp. 343-348.
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(2007) 'Discovery of the proton emitting nucleus
Re'. AIP Conference Proceedings, 961, pp. 28-33.doi: 10.1063/1.2827272
- . (2006) 'Reaction cross-sections for light nuclei on C-12 using relativistic mean field formalism'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 32 (11), pp. 2089-2097.
- . (2006) 'Probing the limit of nuclear existence: Proton emission from Re-159'. ELSEVIER SCIENCE BV PHYSICS LETTERS B, 641 (1), pp. 34-37.
- . (2006) 'Shape-driving effects in the triaxial nucleus, Xe-128'. AMERICAN PHYSICAL SOC PHYSICAL REVIEW C, 74 (3) Article number ARTN 034318
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(2006) 'Spin-excitation mechanisms in Skyrme-force time-dependent Hartree-Fock calculations'. AMERICAN PHYSICAL SOC PHYSICAL REVIEW C, 74 (2) Article number ARTN 027601 Full text is available at: http://epubs.surrey.ac.uk/457/
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(2006) 'Role of boundary conditions in dynamic studies of nuclear giant resonances and collisions'. AMERICAN PHYSICAL SOC PHYSICAL REVIEW E, 73 (3) Article number ARTN 036709 Full text is available at: http://epubs.surrey.ac.uk/51/
- . (2006) 'Deformation effects on the structures of N=7 halo nuclei'. ELSEVIER SCIENCE BV NUCLEAR PHYSICS A, 765 (1-2), pp. 29-38.
- . (2006) 'Clustering in superheavy nuclei within the relativistic mean field approach'. IOP PUBLISHING LTD JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 32 (1), pp. L1-L9.
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(2006) 'Deformed halo nuclei in mean-field approach'. AIP Conference Proceedings, 865, pp. 96-100.doi: 10.1063/1.2398834
- . (2005) 'Shape evolution in the neutron-rich tungsten region'. AMERICAN PHYSICAL SOC PHYSICAL REVIEW C, 72 (4) Article number ARTN 047303
- . (2005) 'Isomers in neutron-rich A approximate to 190 nuclides from Pb-208 fragmentation'. SPRINGER EUROPEAN PHYSICAL JOURNAL A, 23 (2), pp. 201-215.
- . (2005) 'Isovector giant monopole resonances in spherical nuclei'. Journal of Physics G: Nuclear and Particle Physics, 31 (10)
- . (2005) 'Dipole giant resonances in deformed heavy nuclei'. Physical Review C - Nuclear Physics, 71 (6)
- . (2005) 'Density distributions of superheavy nuclei'. Physical Review C - Nuclear Physics, 71 (3)
- . (2005) 'Densities of superheavy nuclei at closed shells'. Journal of Physics G: Nuclear and Particle Physics, 31 (10)
- . (2005) 'Isomers in neutron-rich A ≈ 190 nuclides from Pb fragmentation'. European Physical Journal A, 23 (2), pp. 201-215.
- . (2004) 'Giant resonances from TDHF'. International Journal of Modern Physics E, 13 (1), pp. 181-185.
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(2003) 'Self-consistent description of dysprosium isotopes in the doubly midshell region'. AMERICAN PHYSICAL SOC PHYSICAL REVIEW C, 68 (4) Article number ARTN 044315 Full text is available at: http://epubs.surrey.ac.uk/193/
- . (2003) 'Nuclear matter and neutron star properties calculated with the Skyrme interaction'. Phys. Rev. C, 68 Article number 034324
- . (2003) 'Nuclear matter and neutron-star properties calculated with the Skyrme interaction'. PHYSICAL REVIEW C, 68 (3) Article number ARTN 034324
- . (2003) 'Automatic generation of vacuum amplitude many-body perturbation series'. International Journal of Modern Physics C, 14 (8), pp. 1135-1141.
- . (2002) 'At the N=Z line and beyond: HF+BCS mean-field calculations with the separable monopole interaction.'. ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 224, pp. U92-U92.
- . (2002) 'High-K negative parity states in Os-184'. PHYSICAL REVIEW C, 65 (6) Article number ARTN 064310
- . (2002) 'Structure of the doubly midshell nucleus Dy-170(66)104'. AMERICAN PHYSICAL SOC PHYSICAL REVIEW C, 65 (3) Article number ARTN 037302
- . (2002) 'Analytic angular momentum coupling coefficient calculators'. Computer Physics Communications, 147 (3), pp. 853-858.
- . (2002) 'Mean field calculation of Ne, Mg and Si nuclei at N = 20 with the separable monopole interaction'. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 545 (3-4), pp. 291-297.
Conference papers
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(2012) 'Li-7-Induced Reactions for Fast-Timing With LaBr3:Ce Detectors'. AMER INST PHYSICS NUCLEAR STRUCTURE AND DYNAMICS '12, Opatija, CROATIA: 2nd International Conference on Nuclear Structure and Dynamics 1491, pp. 93-96.doi: 10.1063/1.4764210
- . (2009) 'Mass distributions in a variational model'. SOC MEXICANA FISICA REVISTA MEXICANA DE FISICA, Cocoyoc, MEXICO: 32nd Symposium on Nuclear Physics 55 (2), pp. 114-118.
- . (2009) 'Mass Distributions Beyond TDHF'. AMER INST PHYSICS FUSION 08, Chicago, IL: International Conference on New Aspects of Heavy Ion Collisions Near the Coulomb Barrier 1098, pp. 133-138.
- . (2009) 'A Variational Approach to Mass Fluctuations'. AMER INST PHYSICS NUCLEAR STRUCTURE AND DYNAMICS '09, Dubrovnik, CROATIA: International Conference on Nuclear structure and Dynamics 1165, pp. 177-180.
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(2009) 'New Insights into the Structure of Exotic Nuclei Using the RISING Active Stopper'. AMER INST PHYSICS CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS, Univ Cologne, Inst Nucl Phys, Cologne, GERMANY: 13th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics 1090, pp. 122-129.Full text is available at: http://epubs.surrey.ac.uk/727979/
- . (2007) 'Monopole giant resonances and TDHF boundary conditions'. ELSEVIER SCIENCE BV NUCLEAR PHYSICS A, St Goar, GERMANY: 2nd International Conference on Collective Motion in Nuclei Under Extreme Conditions 788, pp. 343C-348C.
- . (2007) 'Probing single-particle structures beyond the proton drip line'. AMER INST PHYSICS PROTON EMITTING NUCLEI AND RELATED TOPICS, Lisbon, PORTUGAL: International Conference on Proton Emitting Nuclei and Related Topics 961, pp. 137-142.
- . (2007) 'The two-potential approach to one-proton emission'. AMER INST PHYSICS PROTON EMITTING NUCLEI AND RELATED TOPICS, Lisbon, PORTUGAL: International Conference on Proton Emitting Nuclei and Related Topics 961, pp. 66-71.
- . (2006) 'Dipole response in neutron-rich magnesium'. WORLD SCIENTIFIC PUBL CO PTE LTD INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS, Shanghai, PEOPLES R CHINA: International Conference on Nuclear Structure Physics 15 (7), pp. 1417-1423.
- . (2005) 'Isoscalar and isovector giant monopole resonances using TDHF'. AMER INST PHYSICS Exotic Nuclear Systems, Debrecen, HUNGARY: International Symposium on Exotic Nuclear Systems 802, pp. 305-308.
- . (2003) 'Interplay between K-isomerism and gamma-softness in Xe-128'. ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS ACTA PHYSICA POLONICA B, ZAKOPANE, POLAND: 37th Zakopane Meeting of Physics on Trends in Nuclear Physics 34 (4), pp. 2253-2256.
- . (2002) 'Cranked-Hartree-Fock-Bogoliubov analysis at the valence maximum: Yrast behaviour of Dy-170(66)104'. PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, KYOTO UNIV, YUKAWA INST THEORET PHYS, KYOTO, JAPAN: 10th Yukawa International Seminar on Physics of Unstable Nuclei (146), pp. 609-610.
Teaching
Level 1: Computational Laboratory (in 1EM)
Level 2: Modelling Complex Systems (2MCS)
Level 3: Final Year Project Supervision
Level 3: High Energy Physics (3HEP)
Postgraduate: MSc project supervision (REP and Medical Physics degrees)
Departmental Duties
Board of Studies Chairman
Institute of Physics Contact
Faculty Representative on Widening Participation and Outreach Subcommittee
Public Engagement Activities
Paul is involved in public engagement activities and has given public lectures at the Royal Institution, the Cheltenham Festival, the British Science Association Festival, schools, Intitute of Physics Branches, science outreach centres and Cafe Scientifique branches. He has served as chair of the IoP South Central Branch, and Recorder of the British Science Association Physics and Astronomy section

