How magic is the magic 68Ni nucleus?

Abstract

We calculate the B(E2) strength in 68Ni and other nickel isotopes using several theoretical approaches. We find that in 68Ni the gamma transition to the first 2+ state exhausts only a fraction of the total B(E2) strength, which is mainly collected in excited states around 5 MeV. This effect is sensitive to the energy splitting between the fp shell and the g_{9/2}orbital. We argue that the small experimental B(E2) value is not strong evidence for the double-magic character of 68Ni.

4 pages, 4 figures

References in corpus (6)

• Shape Coexistence and the Effective Nucleon-Nucleon Interaction
• A Full $PF$ Shell Model Study of a~=~48 Nuclei
• Monte Carlo evaluation of path integrals for the nuclear shell model
• Shell-model Monte Carlo studies of fp-shell nuclei
• Anomalous Behavior of 2+ Excitations around 132Sn
• On the temperature dependence of the symmetry energy

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