Abstract
The gamma-decay of the 4.46- and 5.03-Mev levels of has been determined by () coincidences using the reaction . The 5.03-Mev level is found to decay with a probability of 0.14±0.03 via the state at 2.13 Mev; the intensity of the branch to the state at 4.46 Mev is less than 3×. The intensity of the branch from the 4.46-Mev level via that at 2.13 Mev is less than 5×. The data on these states are reviewed and it is concluded that the present results strongly favor the choices for the states at 2.13, 4.46, and 5.03 Mev, respectively, without appeal to a model. It is, however, emphasized that the body of data as it stands at the moment might admit for the 2.13-Mev state and for the 5.03-Mev state. The previsions of the independent-particle model (IPM) are then examined and it is concluded that best general agreement between theory and experiment is achieved for . The likely relevance of the collective model is remarked upon. It is demonstrated with the aid of the reaction that the ordering of the first three excited states of is the same as in . The beta-decay of is reconsidered in the light of the increased firmness of the assignments in and of the previsions of the IPM; it is concluded that is most probably of even parity.
- Received 21 February 1961
DOI:https://doi.org/10.1103/PhysRev.123.589
©1961 American Physical Society