Superdeformed bands in80−83Sr,82−84Y,83,84Zr:Transition quadrupole moments, moments of inertia, and configuration assignments

Abstract

Multiple superdeformed bands in the nuclei ${}^{80\ensuremath{-}83}\mathrm{Sr},$ ${}^{82\ensuremath{-}84}\mathrm{Y},$ and ${}^{83,84}\mathrm{Zr}$ have been studied in a backed-target experiment, using the Gammasphere and the Microball 4\ensuremath{\pi} detector arrays. For 15 bands in these nuclei, average transition quadrupole moments have been measured with high accuracy, using the Doppler-shift attenuation method. Among these are the newly observed superdeformed bands in ${}^{83,84}\mathrm{Y},$ which are ``isospectral'' with the bands in ${}^{82,83}$ Sr. These ``isospectral'' bands have nearly identical transition quadrupole moments. Two of the bands in ${}^{81}\mathrm{Sr}$ interact and cross transitions between them are observed. The present measurements place stringent conditions on configuration assignments for the bands obtained from two types of mean-field calculations, leading to a consistent understanding of the mass \ensuremath{\sim}80 superdeformed bands. The assignments for different bands arise from one or more nucleons occupying the ${N}_{0}{=5h}_{11/2}$ intruder orbital.