Nuclear structure far off stability --Implications for nuclear astrophysics

Details Nuclear structure far off stability --Implications for nuclear astrophysics Nuclear structure far off stability --Implications for nuclear astrophysics

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006epja...27s.257g&link_type=abstract

The European Physical Journal A, Volume 27, Issue 1, pp.257-267

Astronomy and Astrophysics

Astrophysics

6

Scientific paper

The single-particle structure and shell gap of 100Sn as inferred from previous in-beam γ-ray spectroscopy has been confirmed in recent studies of seniority and spin-gap isomers by γγ, βγ, βpγ, pγ and 2pγ spectroscopy. The results for 94, 95Ag, 98Cd and its N = 50 isotones 96Pd and 94Ru stress the importance of large-scale shell model calculations employing realistic interactions for the isomerism, np-nh excitations, seniority mixing and E2 polarisation of the 100Sn core. The strong monopole interaction of the Δl = 0, 1 spin/isospin-flip partners πg 9/2- νg 7/2 along the N = 50 isotones and the πf 5/2- νg 9/2 pair of nucleons along the Z = 28 Ni isotopes are decisive for the evolution of the shell structure towards 100Sn and 78Ni. It can be traced back to the tensor force in the effective nucleon-nucleon interaction and provides a straightforward explanation for new shells in neutron-rich light nuclei, implying qualitative predictions for new N = 32, 34 subshells in Ca isotopes, persistence of the 78Ni proton and neutron shell gaps and non-equivalence of the g 9/2 valence mirror Ni isotopes and N = 50 isotones. This is corroborated by recent experimental data on 56, 58Cr and 70-76Ni. The implication of monopole driven shell evolution for apparent spin-orbit splitting towards N ≫ Z and structure along the astrophysical r-path between N = 50 and N = 82 is discussed.

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