Abstract
The α decay of has been observed for the first time and α-decay branching ratios have been determined for and by use of an on-line isotope separator. A single α-decay line at 4444±10 keV has been shown to result from the decay of . The current data are insufficient to determine which of the long-lived states of decays via α emission. The α branching deduced from the α, γ, and x-ray data taken simultaneously is [(1.0±0.4)×]% if the α comes from the 33.0-min isomer, or [(5.0±2.0)×]% if the α comes from the 70.9-min ground state of . In either case the transition is an unhindered one. Two lines at 5069±10 and 4826±10 keV, with relative intensities of 100 and 0.16, are attributed to the α decay of and the deduced α branching is (0.7±0.1)%. The hindrance factors are 0.4 for the 5069-keV, and 8.8 for the 4826-keV transitions.
- Received 8 April 1991
DOI:https://doi.org/10.1103/PhysRevC.44.1208
©1991 American Physical Society