Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 16: Nuclear Structure/Spectroscopy II

HK 16.5: Talk

Tuesday, March 9, 2004, 17:00–17:15, A

Shell-Model Description of Monopole Shifts in Neutron-Rich Cu Nuclei — •Anneleen De Maesschalck, Nadya A. Smirnova, Annelies Van Dyck, and Kris Heyde — Institute for Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, 9000 Gent, Belgium

The nuclear mean field and its corresponding magic numbers have been determined predominantly by the study of nuclei in or near the valley of β-stability. When moving out of this valley towards proton- or neutron-rich nuclei, changes in the nuclear mean field are expected to appear. We have studied changes in the nuclear mean field for neutron-rich nuclei with shell model techniques. The main contribution to the change comes from the monopole part of the effective two-body proton-neutron interaction. We have investigated low-lying states in odd-A Cu nuclei, for which recent experimental data have been obtained [1], [2], [3]. Both schematic and realistic (obtained with a G-matrix [4]) forces have been used, and the monopole shifts obtained with these forces are compared with the results from large-scale shell model calculations, where the same realistic force has been used; in this way, two-body correlations beyond the mean field are brought into account.

[1] S. Franchoo et al., Phys. Rev. C 64 (2001), 054308.

[2] J. Van Roosbroeck et al., submitted.

[3] N.A. Smirnova, A. De Maesschalck, A. Van Dyck, K. Heyde, submitted.

[4] M. Hjorth-Jensen, T.T.S. Kuo, E. Osnes, Phys. Rep. 261 (1995) 125.