PowerPoint Presentation

Nuclear TheoryPaulStevensonNupecc Meeting, Embra 2014

From A Review of UK Nuclear Physics Research, Institute of Physics, 2012Nuclear theorists in the UK

Map reproduced from OrdnanceSurvey map data by permission of OrdnanceSurvey Crown copyright 2013.

Permanent academic staff + STFC Rutherford Fellows

Nuclear theorists in the UKMap reproduced from OrdnanceSurvey map data by permission of OrdnanceSurvey Crown copyright 2013.Postdoctoral staffN.B. Using operational definition of UK theory = those who choose to apply via the STFC Nuclear Physics Grants Panel. There are others working on areas that could legitimately be called nuclear theory: Skyrmion model, lattice QCD, compact stars, general many-fermion theory

Also omitting retired but active staff

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Facilities

Chiral Perturbation Theory work at Manchester Recent extensive analysis of world data on Compton scattering on the proton Best determination of proton EM polarisabilities using heavy baryon PT

JA McGovern, DR Phillips, HW Griehammer, Eur. Phys. J. A 49, 12 (2013)

Black lines show 4th order PT fits to compton scattering data; green the 3rd order results. Points are from various experiments (MAMI etc) as discussed in the article

Method also applied to deuteron data at MAXlab (Lund) to extract proton and neutron polarisabilities see arxiv:1409.3705

Links with Glasgow and Mainz groups for 3He Compton experimentsObvious things to highlight include Judith's analysis of world data on Compton scattering from the proton, to give the best determination of proton EM polarisabilities using heavy baryon ChPT (arXiv:1210.4104). (There's also an important cross check with relativistic ChPT, arXiv:1401.3320.)

This method has been applied to the analysis of the recent deuteron experiment at MAXLab (arXiv:1409.3705). Judith is continuing to contribute theory input to the Mainz and Glasgow groups for the next proton and 3He Compton experiments. She is also providing phenomenological input to the GWU group carrying out lattice QCD calculations of polarisabilities.

I don't know how far back you are going, but you might also want to mention our application of these methods to the proton polarisability effect in muonic hydrogen (arXiv:1206.3030).

Several of us are also applying the functional renormalisation group to nuclear and cold-atom systems (arXiv:1207.5735 and arXiv:1304.5454). The second of these papers, on Efimov physics in four-boson systems, has potentially interesting links with the work Natasha has been doing with Gattobigio and Kievsky.

6Chiral Perturbation Theory work at Manchester

The groups methods were recently applied to the proton size problem, calculating directly the Lamb shift in muonic hydrogen, assessing the role of the proton polarisability and reducing its theoretical uncertainty

Our result leaves no room for any effect large enough to explain the discrepancy between proton charge radii as determined from muonic and normal hydrogen.

MC Birse and JA McGovern, European Physics Journal A 48, 120 (2012)

Cipollone, Barbieri, Navrtil, Phys. Rev. Lett. 111, 062501 (2013)

ADC(3) ab-initio sum of PV coupling to all orders: Ab-initio Studies of the N-O-F chainsKey scientific outputs: Investigations of three-body nuclear interactions (thatare consistent with QCD) are now possible through HPC.- Three-nucleon forces (3NFs) are identified as the key mechanism that determines the neutron driplines for Nitrogen, Oxygen and Fluorine.

- d3/2 raised by genuine 3NF [cf. microscopic shell model [Otsuka et al, PRL105, 032501 (2010)].

- There exists subtle cancellations between ELM (Coulomb) and strong (3NFs) interactions! Systematic overbinding of medium-mass nuclei (in agreement with other ab initio methods) Relative energies (S2n) well reproduced Shortcomings of state-of-the-art chiral interactions identifiedGorkov GF goes beyond standard expansion schemes and are not limited to doubly closed-shells Expansion around a Bogoliubov vacuum From few tens to hundreds of medium-mass open-shell systems ( complete chains)[Som, Cipollone, Barbieri, Navrtil & Duguet, PRC 89 061301R (2014) & in preparation]

Greens functions in medium-mass nucleiNucleon knockout reaction theory (Surrey)Peripheral collisions (E 50A MeV; MSU, RIKEN, GSI)heavy mass A residue is detected,with coincident-ray detectionEvents contributing will be both break-up and stripping both of which leave a mass A residue in the final stategT+xNA+xNlight targetT=9Be,12CSudden removal of nucleonsP0AP||Target T left ing.s. or excited stateNucleon knockout reaction theory (Surrey)

e.g. recent results of 1 neutron removal from 19C @ 243 MeV/u @ RIKEN

Plot shows inclusive parallel momentum distribution. Solid line includes contributions from 23+ and 31+ shell model states of 18C, assumed bound.

Dashed line shows results assuming these states are unbound

UK Theory input (from Tostevin) key in interpreting these reactions in facilities worldwideN Kobayashi, T Nakamura, JA Tostevin et al., Phys. Rev. C 86, 054604 (2012) Recent PRLs from this work: PRL 112, 242501 (2014), PRL 112, 142501 (2014), PRL 112, 112503 (2014), PRL 111, 072501 (2013), PRL 109, 202505 (2012)Structure and Reaction phenomenology

Mean-field & beyond using energy density functionals to undertand nuclear structure. Reactions via time-depdenent EDF

Structure work much-linked with UK & worldwide experimental community e.g. PRC88, 064308 (2013), PRC88, 044301 (2013), PRC85, 034301 (2012)

Recent highlights include new understanding of radius isotope shift in 208PbPM Goddard, PD Stevenson, A Rios, PRL 110, 032503 (2013)

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48Ca+48Ca+208Pb: Time-dependent Hartree-FockJA Maruhn, PG Reinhard, PD Stevenson & AS Umar, Computer Physics Communications 185, 2195 (2014)

48Ca+48Ca+208Pb: Time-dependent Hartree-FockJA Maruhn, PG Reinhard, PD Stevenson & AS Umar, Computer Physics Communications 185, 2195 (2014)Understanding nuclear matter

Self-consistent Greens function with realistic interactionsA Rios and V Soma, Phys. Rev. Lett. 108, 012501 (2012)See also: A. Carbone, A. Polls, C. Providncia, A. Rios and I. Vidaa, EPJA 50, 13 (2014), A Rios, A Polls, W Dickhoff, PRC89, 044303 (2014)

Effective interaction approaches to nuclear matter & neutron starsM Dutra, O Loureno, JS S Martins, A Delfino, JR Stone & PD Stevenson, PRC85, 035201 (2012)15

Overlaps, Asymptotic Normalisation Coefficients, Spectroscopic FactorsExpertise in few-body approaches at Surrey applied to spectroscopic details of light systems applications for nuclear astrophysics

NK Timofeyuk, PRC88, 044315 (2013)Applications outside nuclear physics Many-particle theory applied to boson spectra- A Kievsky, NK Timofeyuk and M Gattobigio, PRA 90, 032504 (2014)

Effective field theory approach to 3He interactions- S-I Ando and MC Birse, Few-body Systems 54, 235 (2013)

Phase transitions in superconductors- NR Walet and MA Moore, PRB 88, 054513 (2013)

Environmental coupling and quantum tunneling in DNA mutation- AD Godbeer, JS Al-Khalili and PD Stevenson, PRA 90, 012102 (2014)

Continuum boundary conditions in nonlinear time-dependent Schrdinger equation- CI Pardi , PD Stevenson and K Xu, PRE 89, 033312 (2014)

and finallyMap reproduced from OrdnanceSurvey map data by permission of OrdnanceSurvey Crown copyright 2013.