Super-allowed Fermidecay: Half-lives ofand
- 1 July 1978
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review C
- Vol. 18 (1), 401-407
- https://doi.org/10.1103/physrevc.18.401
Abstract
The half-lives of the Fermi super-allowed -ray transitions from and have been measured by multiscaling rays (from ) or rays (from ) detected in a plastic scintillator. The activities were made via the reactions at MeV and at MeV respectively. Results for the half-lives were as follows: -70.613 ± 0.025 sec, and -921.71±0.65 msec. Recommendations as to the "best" half-life values for the set of eight most accurately measured Fermi super-allowed transitions are presented and comments are made on the present status of knowledge of the nucleon's mean quark charge as extracted from such transitions following acceptance of Cabibbo universality and the gauge theories as exploited by Sirlin. The value recommended for the vector coupling coefficient effective for nucleon decay (including the "inner" radiative correction) is erg .
Keywords
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