Different particle alignments in N ≈ Z Ru isotopes studied by the shell model
Abstract
Experimentally observed heaviest N ≈ Z nuclei, Ru isotopes, are investigated by the shell model on a spherical basis with the extended P+QQ Hamiltonian. The energy levels of all the Ru isotopes can be explained by the shell model with a single set of force parameters. The calculations indicate enhancement of quadrupole correlations in the N=Z nucleus 88Ru as compared with the other Ru isotopes, but the observed moments of inertia seem to require much more enhancement of quadrupole correlations in 88Ru. It is discussed that the particle alignment takes place at 8+ in 90Ru but is delayed in 88Ru till 16+ where the simultaneous alignments of proton and neutron pairs take place. The calculations present interesting predictions for 89Ru that the ground state is the 1/2- state and there are three J=2 bands with different particle alignments including the T=0 p-n pair alignment.
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