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Tübingen 2003 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 29: Kernphysik/Spektroskopie IV

HK 29.6: Talk

Wednesday, March 19, 2003, 15:30–15:45, A

Neutron-rich nuclei beyond N=28 and the N=40 and 50 shell closure — •H. Grawe1, J.M. Daugas2, G. Georgiev2, R. Grzywacz3, M. Lewitowicz2, H. Mach4, G. Neyens5, F. Nowacki6, M. Pfützner7, M. Sawicka7, O. Sorlin8, and M. Stanoiu21GSI,Darmstadt/D — 2GANIL,Caen/F — 3ORNL,Oak Ridge/US — 4ISV,Uppsala Univ./S — 5IKS,KU Leuven/B — 6IReS,Strasbourg/F — 7IEP,Warsaw Univ./PL — 8IPNO,Orsay/F

The dominant monopole interaction of the spin-flip partners π f5/2 − ν f7/2 and π f5/2 − ν g9/2 is decisive for the shell structure of neutron-rich nuclei beyond N=28. The weakness and extreme locality of the N=40 shell in 68Ni and the persistence of the N=50 shell at 78Ni can be traced back to monopole driven migration of selected single particle orbits [1]. Recent experimental data on isomer spectroscopy in 67Fe [2], 70,76Ni [3], 78Zn [4]; β-decay of 72Co [5]; g-factors in 67Ni, 69Cu [6]; Coulomb excitation of 68Ni [7]; and ps-lifetimes in 67,69,70Ni, 71Cu [8] give evidence for this scenario, which implies new shell structure in light and medium-heavy neutron-rich nuclei. The experimental results are discussed in the frame work of large-scale shell model calculations.

[1] H. Grawe, Proc. Zakopane, 2002, Act. Phys. Pol. B, in print

[2] M. Sawicka et al., Eur. Phys. J. A15, in print

[3] M. Sawicka et al., Proc. NS2002, Padova, Eur. Phys. J. A, in print

[4] J.M. Daugas et al., Phys. Lett. B476, 213 (2000)

[5] R. Grzywacz et al., Proc. NS2002, Berkeley, AIP CP, in print

[6] G. Georgiev et al., J. Phys. G28, 2993 (2002)

[7] O. Sorlin et al., Phys. Rev. Lett. 88, 092501 (2002)

[8] H. Mach et al., Proc. NPDC17, Nucl. Phys. A in print

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