Global microscopic calculations of odd-odd nuclei

摘要

The macroscopic-microscopic finite-range droplet model is combined with a particle-rotor coupling model in order to systematically describe low-energy spectra of odd-odd nuclei. The odd proton and neutron are allowed to interact through effective nuclear forces representing the residual neutron-proton interaction. In particular, ground-state spins and parities are calculated and compared to data, where all 268 axially symmetric nuclei which have reliable spin and parity assignments in the Nubase 2016 database are considered. Using a residual neutron-proton interaction composed of both central and tensor terms the agreement with experimental groundstate spins and parities reaches 41% for spherical nuclei and 31% for deformed nuclei. The model is applied to study possible alpha-decay chains in superdeformed odd-odd nuclei, and Q(alpha), values are calculated considering favored decay-paths as compared to ground-state paths.