We have calculated the rate for radiative pion capture from a $1s$ atomic orbital for the ${}_{}{}^3{}_{}{}^{}\mathrm{He}({\pi }^{-}, \gamma ){}_{}{}^3{}_{}{}^{}\mathrm{H}$ analog transition. We obtain reasonable agreement with the experimental Panofsky ratio when this radiative capture rate is combined with our estimate of the corresponding ${}_{}{}^3{}_{}{}^{}\mathrm{He}({\pi }^{-}, {\pi }^0){}_{}{}^3{}_{}{}^{}\mathrm{H}$ charge exchange rate. Threshold pion photoproduction cross section estimates are also given.

NUCLEAR REACTIONS ${}_{}{}^3{}_{}{}^{}\mathrm{He}({\pi }^{-}, \gamma )$, ${}_{}{}^3{}_{}{}^{}\mathrm{He}({\pi }^{-}, {\pi }^0)$; calculated threshold cross sections, capture rate, Panofsky ratio.

• Received 28 March 1978

DOI:https://doi.org/10.1103/PhysRevC.18.1761