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Nuclear Theory at Surrey The Cosener’s House, Abingdon, Wednesday 23 rd May 2007

Jeff Tostevin, Department of Physics Faculty of Engineering and Physical Sciences University of Surrey, UK. Nuclear Theory at Surrey The Cosener’s House, Abingdon, Wednesday 23 rd May 2007. People and connectedness.

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Nuclear Theory at Surrey The Cosener’s House, Abingdon, Wednesday 23 rd May 2007

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  1. Jeff Tostevin, Department of Physics Faculty of Engineering and Physical Sciences University of Surrey, UK Nuclear Theory at Surrey The Cosener’s House, Abingdon, Wednesday 23rd May 2007

  2. People and connectedness

  3. Academic Staff Jeff Tostevin (Professor) ***JimAl-Khalili (Professor) ******Makito Oi (Advanced Fellow and Lecturer) *** Paul Stevenson (Lecturer) Phil Walker (fraction, Professor)Ron Johnson (Emeritus Professor)Research Staff***Qiang Zhao(Advanced Fellow) *** Natasha Timofeyuk (PDRA) A.N. Other (PDRA)***Alex Brown (MSU, Visiting Fellow: 4 months) *** *** Ian Thompson (LLNL, Visiting Fellow: 2 months) *** Research students 12 PGR students Theory Personnel - May 2007

  4. We link strongly with both the UK and international experimental programmes in RIB (GSI, GANIL, TRIUMF, MSU, RIKEN) and hadron physics (MAMI, Beijing, JLab); Joint grants/investigators RISING (GSI) – Tostevin, Stevenson p-decay (L’pool, Daresbury) – Al-Khalili, Stevenson Laser Spectroscopy (B’ham, Manchester) - Stevenson ANU (Break-up and/on Fusion) -Tostevin Experimental proposals, e.g. RIKEN (RIBF) 80Zn  78Ni, 2p knockout MSU (NSCL) 2N knockout, pickup, break-up Training Schools (theoretical pull to attractVisiting Fellows) Mini-School on the Nuclear Shell Model – March 2007 - Brown Mini-School on Direct Nuclear Reactions (planned) – Thompson based on successful JINA event at MSU Collaboration and training

  5. Science base and scope

  6. Nuclear reactions/dynamics: (Tostevin, Al-Khalili, Johnson) Reactions for exotic nucleus spectroscopy: e.g. nuclear- and nucleon-induced knockout, transfer, breakup, proton decay… Reaction dynamics and novel few- and many-body methodologies. Reactions for astrophysics and fusion reactions.Emphasis is on prediction of and quantitative confrontation of new data and phenomena.Nuclear structures/dynamics: (Stevenson, Oi, Walker)Few, many-body and collective dynamical models. Unconstrained deformed mean field (and beyond) calculations. Time-dependence, dynamics, the nuclear response, and the GR. 3D rotation – novel rotational modes, Bose condensates. Isomeric states Hadron physics: (Zhao, Al-Khalili) Hadron resonances and spectroscopy, multi-quark models. Activity – increasingly, the borders merge

  7. Nuclear reactions/dynamics:PRL 98, 152701 (2007), 96, 032502 (2006), 96, 162501 (2006),PRL 93, 042501 (2004), 91, 232501 (2003), 91, 012501 (2003), PRL 90, 159201 (2003), Nature435, 922 (2005) Nuclear dynamics/structures: PLB 641, 34 (2006), 634, 30 (2006),PRL 92, 252501 (2004),PLB 606, 43 (2005), 576, 75 (2003), 545, 291 (2002)Hadron physics:PRL 96, 132003 (2006), 91, 022004 (2003),PLB 645, 173 (2007)PLB 636, 197 (2006), 631, 22 (2005), 596, 317 (2004), PLB 590, 176 (2004), 586, 91 (2004), 553, 211 (2003) Theoretical activity – Recent “Letters”

  8. Nuclear Structure Theory

  9. effective interaction mean field+ beyond Effective interactions and nuclear responses Giant resonances+ fusion reactions nuclear matter+ neutron stars + correlations in TDHF isomeric states Ground state structure proton emitting nuclei Funded collaborations with the Surrey/UK experimental effort

  10. Microscopic and Quantal descriptions of structure of many-body systems under rotation • High-spin nuclear structure (Fermion) • Self-consistency in collective and single-particle degrees of freedom • Variational approach with quantum-number projections (and Generator Coordinate Method)  VAP (variation after projection) • Rotating Bose-Einstein condensate of ultra-cold atomic gases in a trap (Boson) • Quantum phase transition from collective modes to vortices and/or the Lowest Landau Level.

  11. Influence of nuclear shapes on decay rates These effects are being investigated in collaboration with Professor F Xu (Beijing University) using a Woods-Saxon-Strutinsky method with a realistic treatment of pairing. J=7 isomer Cut through the calculated energy surface for 256Fm, versus quadrupole deformation ground state Will high-spin isomers enable the observable stability limits to be further extended? deformation P.M. Walker and F.R. Xu, Phys. Lett. B 635 (2006) 286 F.R. Xu et al., Phys. Rev. Lett. 92 (2004) 252501

  12. Nucleon and resonance decays (Halos and astrophysics)

  13. Proton decay and 3-body decay widths [accuracy of R-matrix methods (Barker), also relevant to knockout reactions to unbound states, e.g. 6He(2+) ] Intermediate Final Initial 2+ Q2n E 3/2- Q1n U 6He 5He 0+ 4He Threshold Three-body decay as two sequential decays

  14. Nuclear reactions for astrophysics Possible pre-asymptotic abnormalities in single-particle behaviour near the drip-line and their influence on (N, ) reaction rates. Improvements to theories of nucleon transfer and capture reactions - used to determine relevant reaction rates. Mirror symmetry as tool to pin down cross sections for (N, ), (, ), (N, ) reactions in stars. (Timofeyuk, IoP Conf 2007) • 7Li+8Li (TRIUMF) will test transfer theory and constrain 7Be(p,)8B using mirror symmetry solar neutrino physics • Pre-asymptotic abnormalities in 9C and 16C  uncertainties in 8B(p, )9C (explosive hydrogen burning) and 15C(n, )16C (neutrino-driven wind r-process of supernova explosions)

  15. New reaction methodologies for the most rare, exotic systems

  16. 1 9Be 2 c Knockout spectroscopy : First study of 36Mg 1) Insufficient yield for, e.g. secondary beam inelastic scattering 2) Parent for beta decay, 37Na, is particle unbound 3) So, use 2p removal from n-rich (sd-shell) parent, 38Si Microscopic theory of 2N removal developed at Surrey Experimental/theory advances: Phys Rev Lett 91 012501 (2003) NATURE 425,570 (2003), NATURE 435,924 (2005), NATURE 435, 897 (2005) Phys Rev C 74 064604 (2006) Phys Rev C 70064602 (2004)

  17. The Island of Inversion extends to 36Mg? 38Si Monte-Carlo shell model calculations: SDPF-M interaction of Otsuka et al. + p n p n p n Measured cross sections and those calculated assuming population of the 0hw components of the final states by the direct 2p knockout reaction mechanism

  18. RISING: neutron rich systems near 208Pb Work in progress is looking at multi-proton knockout from 208Pb – and the yields/isomeric ratios of low seniority, high spin isomeric states in heavy neutron-rich systems (Steer, Podolyak, Regan) Cross section (mb) 208Pb + Be 1 GeV/nucleon number of removed protons impact parameter (fm) Data: T. Kurtukian Nieto, PhD Thesis, Universidade de Santiago de Compostela (2007)

  19. Science and connectedness

  20. We link strongly with both the UK and international experimental programmes in RIB (GSI, GANIL, TRIUMF, MSU, RIKEN) and hadron physics (MAMI, Beijing, JLab); Joint grants/investigators RISING (GSI) – Tostevin, Stevenson p-decay (L’pool, Daresbury) – Al-Khalili, Stevenson Laser Spectroscopy (B’ham, Manchester) - Stevenson ANU (Break-up and/on Fusion) -Tostevin Experimental proposals: prediction and interpretation e.g. RIKEN (RIBF) 80Zn  78Ni, 2p knockout MSU (NSCL) 2N knockout, pickup, break-up, etc Training Schools: We have the ‘pull’ to attract first class theorists that enrich and stimulate our programme Fundamental theory developments:Structure, reactions, few- and many-body nuclear (and hadronic) systems. Collaboration, fundamental questions, training

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