Abstract
A second -decaying high-spin isomeric state, with a half-life of 197(22)ns, has been identified in the nuclide as part of a stopped-beam Rare Isotope Spectroscopic INvestigation at GSI (RISING) experiment. Weisskopf estimates were used to establish a tentative spin/parity of , corresponding to the maximum possible spin of a negative parity state in the restricted (, ) model space of empirical shell model calculations. The reproduction of the decay properties of the isomer required an extension of the model space to include the and orbitals using the CD-Bonn potential. This is the first time that such an extension has been required for a high-spin isomer in the vicinity of and reveals the importance of such orbits for understanding the decay properties of high-spin isomers in this region. However, despite the need for the extended model space for the decay, the dominant configuration for the state remains ()(). The half-life of the known, , isomer was remeasured and yielded a value of 499(13) ns.
- Received 26 October 2010
DOI:https://doi.org/10.1103/PhysRevC.82.061309
© 2010 The American Physical Society