Beta-ray branching and half-lives ofand
- 1 January 1978
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review C
- Vol. 17 (1), 280-286
- https://doi.org/10.1103/physrevc.17.280
Abstract
The ratio of and -ray branches to the 4.44-MeV excited state of was measured by detecting rays in a plastic scintillator and rays in two Ge(Li) detectors. Activities were made in the and reactions using a chopped Van de Graaff beam. Data were stored in two successive computer time bins of two half-lives each in order to establish by subtraction the shape of the short-lived -ray spectrum and its net number of counts. The ratio of these branches was found to be / = 1.56±0.05. A measurement of the absolute -ray branch to the 4.44-MeV state via coincidences using an NaI(T1) detector for the rays gave a value of 1.276±0.050%. Half-lives, obtained by multiscaling -ray counts, were found to be 20.20±0.02 msec for and 11.000±0.016 msec for . The mirror asymmetries derived from these results are for the decay to the 4.44-MeV state of and for the branch to the ground state.
Keywords
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