Theoretical PerspectivesThe Cosener’s House, Abingdon,

Thursday 11th September 2008

Jeff Tostevin, Department of PhysicsFaculty of Engineering and Physical SciencesUniversity of Surrey, UK

Theory “Health” – Post Rolling Grants 2008 Surrey Manchester

Jeff Tostevin Mike Birse Jim Al-Khalili Judith McGovern Makito Oi Niels Walet Paul Stevenson Ray Bishop Ron Johnson (Emeritus) (T)

Research Staff Natasha Timofeyuk (9/08) Shung-ichi Ando (B, 8/09) Sara Fracasso (B, 2/10) A.N. Other (1/08) Ian Thompson (LLNL, VF) Daniel Phillips (Ohio, VF) Qiang Zhao (ARF)

Research studentships 3 quota, 2 project (10/09) 1 quota

ECT* Workshop support and organisation: 08TNET: The EURONS European Theory Network 7-11/1 [Surrey +]

Quasifree Scattering with Radioactive Ion Beams 7-11/4 [Daresbury + Surrey + ]

Workshop on Hard Exclusive Reactions 9-13/6 [Glasgow + ]

Ultra High-Intensity Laser Nuclear/Particle Physics 23-27/6 [Plymouth +Strathclyde +]

Scaling the heights of the N=Z line above 56-Ni 16-18/9 [York + ]

Confrontation and Convergence of Nuclear Theory July 2009 [Tostevin, Surrey + ]

Future ECT* contributions – a theory facility

‘Contribution’ of circa £15k/yr was supported by EPSRC, and co-ordinated through Surrey (ThompsonTostevin) . Due for renewal / negotiation.

“15 Year ECT* Perspective” and future funding meeting at Trento (25-25th September 08)

STFC cannot be present – (BJF, JAT) at 25/9 funding meeting. Route for future support is essentially agreed ay 25k Euro per annum level.

Development of hyperspherical formalism

• more efficient, approach to construct hyperspherical basis for many-body systems has been developed• applied to bosonic (cluster) systems 12C = 3α and 16O = 4α

Perspectives of new approach are:Advances such ab-initio methods, as correlated hypersphericalharmonics or effective interactions, towards heavier nuclei

Study of threshold behaviour of spectroscopic factors and mirror symmetry in 3-body systems

Three-body calculations suggest that spectroscopic factors in mirror systems can be different.

The most striking result:

For 18O (0+1,2) 17O(5/2+)

and 18Ne(0+1,2) 17F(5/2+)

Sp/Sn = 1.25

Experimental study of mirror spectroscopic factors, either through knock out reactions on 18O(0+

1) and 18Ne(0+1) or in transfer

reactions 17O(a,b)18O(0+2) and 17F(c,d)18Ne(0+

2), will assess the

applicability of three-body models to realistic nuclei.

Dissipative quantum dynamics in nuclear collisions

Example of p-pickup – 22Mg + 9Be 23Al + X

5/2+

22Mg+p

0+

23Al

(7/2+)

1247 keV

1616 keV 2+

Sp=122(19) keV

Qp=244(21) keV

A. Gade at al., Phys. Lett. B 666 (2008) 218

100 MeV/nucleon

[ 0.54(5) mb ]

Removal strengths at the Fermi surfaces

+Shell M)

44S

L.A. Riley et al., PhysRev C78, 011303(R) (2008)

Two neutron knockout from 22Mg 20Mg(0+,2+)

22Mg (2n) 75.1 A MeV

Re

sid

ue

mo

me

ntu

m d

istr

ibu

tion

0+

2+

E. Simpson et al., in preparation

Expt.

0+ 84%

2+ ~16%

28Mg→26Ne (all) – Full calcs, Ed Simpson

D. Bazin, private communication

28Mg (-2p) on 9Be at 82.3 MeV per nucleon

-0.2

0

0.2

0.4

0.6

0.8

Sig

ma

(m

b)

0+ 2+ 2+4+1 2