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 an enhancement of quadrupole correlations in the N=Z nucleus 88 Ru as compared with the other Ru isotopes, but the observed moments of inertia seem to require much more enhancement of quadrupole correlations in 88 Ru . It is discussed that the particle alignment takes place at 8+ in 90 Ru but is delayed in 88 Ru till 16+ where the simultaneous alignments of proton and neutron pairs take place. The calculations present interesting predictions for 89 Ru that the ground state is the 1/ 2- state and there are three ΔJ=2 bands with different particle alignments including the T=0 p-n pair alignment.
- Publication:
-
Physical Review C
- Pub Date:
- March 2004
- DOI:
- arXiv:
- arXiv:nucl-th/0312019
- Bibcode:
- 2004PhRvC..69c4324H
- Keywords:
-
- 21.10.Hw;
- 21.10.Re;
- 21.60.Cs;
- 23.20.Lv;
- Spin parity and isobaric spin;
- Collective levels;
- Shell model;
- gamma transitions and level energies;
- Nuclear Theory
- E-Print:
- 11 pages including 10 figures, to be published in Phys. Rev. C