The $\frac{K}{{\beta }^{+}}$ ratio in the decays of ${}_{}{}^{19}{}_{}{}^{}\mathrm{Ne}$ and ${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$ have been measured as (9.6 ± 0.3) × ${10}^{-4\mathrm{}}$ and (10.7 ± 0.6) × ${10}^{-4\mathrm{}}$, respectively. A gas-flow proportional counter, operating in anticoincidence with the surrounding plastic scintillator, was used. Theoretical $\frac{K}{{\beta }^{+}}$ ratios for ${}_{}{}^{19}{}_{}{}^{}\mathrm{Ne}$ and ${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$ were computed, using exchange-overlap corrections calculated by Vatai and, separately, exchange corrections extrapolated from the results of Bahcall for $14\le Z\le 37$. The experimental results were found to be in better agreement with Vatai's calculations.

• Received 12 June 1972

DOI:https://doi.org/10.1103/PhysRevC.6.1132