Gamma decays from excited states up to Jπ=6+ in the N=Z-2 nucleus Ni54 have been identified for the first time. Level energies are compared with those of the isobars Co54 and Fe54 and of the cross-conjugate nuclei of mass A=42. The good but puzzling f7/2 cross-conjugate symmetry in mirror and triplet energy differences is analyzed. Shell model calculations reproduce the new data but the necessary nuclear charge-dependent phenomenology is not fully explained by modern nucleon-nucleon potentials.
ASJC Scopus subject areas
- Physics and Astronomy(all)