Abstract
The decay of has been studied by means of plastic and NaI (Tl) scintillation detectors. The activity was formed in the reaction using a mechanically chopped beam of 3.0-MeV tritons from a Van de Graaff accelerator. coincidence measurements have confirmed a previously reported branch to the 3.68-MeV second excited state of . By means of a -neutron time-of-flight method, branches to neutron-emitting levels of at 7.5 and 8.86 MeV have been observed. The levels in MeV, branches to these levels in percent, and the corresponding values are ground, 92.1±0.8, 4.02±0.02; 3.68, 7.6±0.8, 4.47±0.05; 7.5, 0.094±0.020, 5.37±0.09; and 8.86, 0.16±0.03, 4.63±0.08. The present results are consistent with recent assignments of to the 7.55- and 8.86-MeV levels, respectively. It is suggested that the 7.55-MeV member of the 7.50-7.55-7.68 triplet is the one populated in decay. The experimental values agree well with theoretical calculations by Cohen and Kurath.
- Received 27 May 1969
DOI:https://doi.org/10.1103/PhysRev.186.978
©1969 American Physical Society