The Gamow-Teller $\beta$ decay from the ${}_{}{}^{14}{}_{}{}^{}\mathrm{O}$ $0^{+}$ ground state to the 3.948 MeV $1^{+}$ level in ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ has been studied by observing $\gamma$ rays from the deexcitation of the 3.948 and 2.313 MeV levels in ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$. We measured a branching ratio of (5.28 ± 0.23) × ${10}^{-14\mathrm{}}$ relative to the superallowed Fermi decay to the 2.313 MeV level, and deduce $ft=1446\mathrm{}\pm 63$. The corresponding Gamow-Teller transition strength is $B\left(\mathrm{GT}\right)=2.73\mathrm{}\pm 0.12$. This value is about 40% lower than predicted by several widely used shell model calculations, and may suggest appreciable quenching by mesonic currents.

RADIOACTIVITY ${}_{}{}^{14}{}_{}{}^{}\mathrm{O}$ measured $I_{\gamma }$, GT strength.

• Received 5 June 1981

DOI:https://doi.org/10.1103/PhysRevC.24.2235