Theoretical Perspectives The Cosener’s House, Abingdon, Thursday 11 th September 2008

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