We obtain a branching ratio of (1.20 ± 0.20) × ${10}^{-4\mathrm{}}$ for the ${\beta }^{+}$ decay of ${}_{}{}^{19}{}_{}{}^{}\mathrm{Ne}$ to the 110 keV ${\frac{1}{2}}^{-}$ level of ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$. This transition (presumably dominated by the $\Delta J^{\pi }=0^{-}$ axial charge operator) provides a crucial test of wave functions used in interpreting the parity mixing of the ground and 110 keV levels of ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$. These wave functions, which yield a parity mixing larger than that observed experimentally, also predict too large a ${\beta }^{+}$ decay rate.

[RADIOACTIVITY ${}_{}{}^{19}{}_{}{}^{}\mathrm{Ne}$; measured branch to ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$(110 keV); deduced $\mathrm{ft}$. Compared to shell model calculation.]

• Received 24 March 1981

DOI:https://doi.org/10.1103/PhysRevC.24.313