Abstract
Levels in have been studied using heavy-ion reactions. The experiments included -ray yields as a function of bombarding energy, -ray angular distributions, and three-detector coincidence measurements. The positive-parity band based on the unique-parity orbital in both nuclei exhibits a character, unlike its counterpart band in Pd nuclei. The energy levels, -ray mixing ratios, branching ratios, and lifetimes in this band as well as in the ground-state negative-parity band are shown to be in good agreement with calculations using a particle-plus-rotor model at a small, symmetric deformation (). The Coriolis and recoil effects are explicitly included and a variable moment of inertia is used. The low-lying "anomalous" state is also readily reproduced by this model. The calculation also shows that the nature of the positive-parity band results primarily from the fact that the Fermi surface is far from the state, whereas the transition properties are governed by the Coriolis mixing of the strong-coupled bands. Two bands built on the and states with high bandhead energies are thought to have three-quasiparticle configurations.
NUCLEAR STRUCTURE (,) at 60 MeV, (, ) at 49 MeV: measured , , , coin DCOQ. deduced levels, , , mixing ratios. Rotational model calculations, Coriolis, calculated levels, mixing ratios, branching ratios, lifetimes. Ge(Li) detectors.
- Received 7 May 1979
DOI:https://doi.org/10.1103/PhysRevC.20.1350
©1979 American Physical Society