Abstract
The decay of 5.2-min to levels in has been investigated by -ray and conversion-electron spectroscopy. Of 78 rays assigned to the decay, 69 have been placed in a decay scheme consisting of 31 excited states. The ground state is probably and is interpreted as the () configuration. decays with values in the allowed range to states at 2425.5 and 2878.3 keV are explained by and configurations, respectively. A quasi- band is proposed with levels at 884.5 keV (), 1324.5 keV (), 1372.4 keV (), and 1931.4 keV (). A state at 1939.4 keV is possibly the band member. The properties of were calculated using the microscopic boson-expansion code of Kishimoto and Tamura and found to be in rather good agreement with experiment. The small experimentally observed splitting (48 keV) between the and states is a signature of instability. The prolate-oblate difference, consistent with the experimental data, is estimated to be 0.5 MeV, a value in good agreement with potential-surface calculations.
[RADIOACTIVITY [from ], measured , , , , coin; deduced . deduced levels, ICC, , . Enriched target, Ge(Li) and Si(Li) detectors.]
- Received 10 January 1977
DOI:https://doi.org/10.1103/PhysRevC.16.408
©1977 American Physical Society