Abstract
The reaction at MeV has been used to investigate the decay of states in . The -ray spectrum from a NaI(Tl) detector in coincidence with protons leading to the 15.11-MeV state of exhibits transitions of 2.38 ± 0.02, 4.44, 7.48 ± 0.03, 10.71 ± 0.05, and 15.11 MeV. Relative -ray branches from the 15.11-MeV state to the 12.71-, 7.65-, 4.44-MeV and ground states are (1.4 ± 0.4), (2.6 ± 0.7), (2.3 ± 0.9), and (92 ± 2)%, respectively, where an allowance of 1.6% has been made for a possible but unobserved 15.11 → 10.3 transition. Also observed were -ray branches of (15 ± 4) and (85 ± 4)% from the 12.71-MeV state of to the 4.44-MeV and ground states, respectively. -branching intensities from the 15.11-MeV state are compared with the corresponding -transition rates of and to these same states of , and the conclusions about the orbital contribution to the -ray transition strength are compared with shell-model expectations. Previously reported evidence for an isospin-forbidden -decay branch from the 15.11-MeV level is discussed in the light of the present results.
- Received 24 September 1971
DOI:https://doi.org/10.1103/PhysRevC.5.384
©1972 American Physical Society