Abstract
Nuclides with A=152 were produced in bombardments of and their decay properties were investigated following on-line mass separation. The isotope (=0.7±0.1 s) was identified by γ rays in its β-decay daughter, . Based on its decay characteristics, the parent state has a probable spin and parity assignment of (4,5,). Several new transitions were observed to follow the β decays of and the low-spin isomer; they established previously unknown levels in both and . The additional γ rays in decay reduce from 100% to 88% the direct feeding to the one excited state in that had been known earlier. Nevertheless, the corresponding logft value is calculated to be 3.5, indicating that this is an allowed β transition which connects the parent with a excited state in . By comparing the β-decay rates of and , and the α- and β-decay rates of , an α branch of 90±4 % was deduced for .
- Received 4 August 1986
DOI:https://doi.org/10.1103/PhysRevC.35.310
©1987 American Physical Society