Abstract
The previously unreported decay of to levels in has been studied from mass-separated activity produced in the thermal neutron fission of . A half-life for was measured to be 68±8 ms. Based on γ singles and coincidence measurements, 24 γ rays were placed in a level scheme for with nine excited states up to 1689 keV. Four excited states were assigned a of from logft values. Evidence for delayed-neutron emission from is reported. These results are compared with systematics for other neighboring, highly deformed, odd-odd Y and Nb nuclei. The level structure of A∼100 Y nuclei, which exhibit a very abrupt transition from spherical to highly deformed shapes, is reviewed. The possibility of the existence of bands with moments of inertia close to that of a rigid rotor is discussed.
- Received 16 December 1985
DOI:https://doi.org/10.1103/PhysRevC.33.1727
©1986 American Physical Society