Abstract
The level structure of has been examined utilizing gamma-ray spectroscopy following the reaction and decay. Excitation functions, coincidences, and angular distributions were measured. Spectroscopic information, e.g., spins, branching ratios, and multipole-mixing ratios, was obtained for many new levels below 4.5 MeV in excitation energy. The level scheme was examined from the viewpoint of an anharmonic vibrator model, the general collective model, the particle-core coupling model, and interacting-boson-model-based intruder models. Particular aspects of the level sequence can be reproduced by each of these models, but the agreement with transition rate data is modest. The transition rate ratios are most consistent with the simple U(5) pattern. The higher-spin intruder states are identified in by comparison to the known band structures and decay patterns of the and tin and cadmium nuclei. The intruder signature vanishes below spin-8, where there is strong mixing between states.
- Received 16 June 2002
DOI:https://doi.org/10.1103/PhysRevC.68.034315
©2003 American Physical Society