Abstract
The structure of has been investigated by performing measurements of γ-ray and conversion-electron singles and γγ coincidence spectra of mass separated sources of 56-s . The proposed level scheme extends the known structure of to an energy of 2.2 MeV and includes several levels below 1.2 MeV that have not been identified in previous decay studies of . Measurement of the conversion coefficients for several transitions has led to the assignment of negative parity to the levels at 362, 452, 467, and 608 keV in , which show properties similar to low-energy negative-parity states identified in , , and . The presence of low-energy negative-parity states suggests that configurations having significantly different deformation, related to the highly deformed region above N=90 and/or to the reflection asymmetric region identified around , may manifest themselves at low energy in these nuclides.
- Received 28 January 1993
DOI:https://doi.org/10.1103/PhysRevC.48.1579
©1993 American Physical Society