Abstract
has been made in the reaction and its radiations have been studied with plastic and NaI(Tl) scintillation spectrometers both singly and in coincidence. The half-life as determined from measurements on both beta rays and gamma rays is 13.57±0.15 sec. Decay takes place by beta-ray emission to the ground state of (61%, , Mev), to the 2.14-Mev first excited state (29%, ), to the 6.76-6.81-Mev doublet (6.5%, ) and to the 7.99-Mev level (4.1%, ). Limits are set on the decay to several other levels, particularly those at 4.46 and 5.03 Mev (≤0.2%). Gamma rays of 2.121, 4.64, 5.86, 6.76, and 7.97 Mev are observed both singly and in coincidence with beta-ray branches. An energy separation -=11.48±0.15 Mev is derived from the various beta and gamma-ray energy measurements. It is concluded that the assignment for , as expected from the shell model, is possible but cannot be established firmly on the basis of the present evidence.
- Received 30 September 1958
DOI:https://doi.org/10.1103/PhysRev.113.563
©1959 American Physical Society