Measurements of the angular distributions of the single charge exchange reactions to isobaric analog states for ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}({\pi }^{+}, {\pi }^0){}_{}{}^{13}{}_{}{}^{}\mathrm{N}$ and ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}({\pi }^{+}, {\pi }^0){}_{}{}^{15}{}_{}{}^{}\mathrm{O}$ at 165 MeV are described. The two angular distributions are very similar. The shapes are reproduced by semiphenomeno-logical isobar-doorway calculations and by second-order coupled channels calculations. The calculated magnitudes are low by about a factor of 2. The measurements are consistent with older angle-integrated cross sections for ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$.

NUCLEAR REACTIONS ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}({\pi }^{+}, {\pi }^0)$, $T_{\pi }=164\mathrm{}$ MeV; measured $\sigma \left(\theta \right)$; IAS transitions; enriched targets; test of reaction models.

• Received 8 January 1982

DOI:https://doi.org/10.1103/PhysRevC.26.189