Abstract
The beta spectrum of has been examined with an intermediate-image spectrometer adapted for coincidence measurements. The beta decay was found to be complex with two beta groups of maximal energies 574±3 kev and 432±2 kev. The data obtained indicated the presence of a single gamma ray, with an energy of 144.9±0.7 kev. Coincidence measurements inferred that the gamma ray was in coincidence with the lower-energy beta group. Gamma-ray spectra obtained with a scintillation spectrometer and a thin-lens spectrometer indicated that only one gamma ray is present in . Transitions ascribed to higher- and lower-energy beta groups are , "yes" and , "yes," respectively. The gamma ray is probably magnetic dipole radiation. An state, with odd parity, is assigned to the ground state of ; a state, with even parity, is assigned to the first excited state of .
- Received 8 November 1954
DOI:https://doi.org/10.1103/PhysRev.97.1031
©1955 American Physical Society