Abstract
-delayed proton and -ray measurements have been used to study the decay of and . Their half-lives have been measured as 109.0 ± 1.0 and 173.0 ± 2.0 msec, respectively, and absolute values have been determined for their -decay branches. Precise level energies have been measured in and , and an earlier discrepancy concerning energies in has been resolved. The value for the superallowed decay branch of has been measured to be , which indicates an isospin purity of ≥95% for the lowest state in . In addition, the antianalog configuration is located in and is shown to be the most probable source of the small isospin mixing present in the analog state in that nucleus. The value measured for the superallowed decay branch from was 3.34 ± 0.05, a value which suggests an impurity of ∼10% in the lowest state in . There is circumstantial evidence that this mixing occurs with four states which lie within 350 keV of the analog state.
- Received 8 October 1970
DOI:https://doi.org/10.1103/PhysRevC.3.700
©1971 American Physical Society