Abstract
Sources of have been produced by reactions in Zn (enriched to 78.3% ) and their decay has been studied with scintillation and semiconductor detectors. The half-life of has been determined to be 3.0±0.1 min. Seventy-nine percent of the decay is by direct beta decay to the ground state of ( MeV, ). The remaining decay modes exhibit a complex spectrum for which a level scheme has been established. The proposed levels that are fed by the decay are at 0.5307, 0.8340, 1.0065, 1.1795, 1.428, 1.825, and 2.026 MeV. Other suggested but more tentative levels are at 0.615, 2.17, and 2.4 MeV. Of the beta-decay modes, those to the 0.5307- and 0.615-MeV levels have the highest values, namley ∼6.7 and 6.8, respectively. The values of the other branches are smaller than 5.7 and all indicate allowed beta decay.
- Received 30 March 1966
DOI:https://doi.org/10.1103/PhysRev.150.886
©1966 American Physical Society