The reaction ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}({\pi }^{+}, {\pi }^{-})$ ${}_{}{}^{18}{}_{}{}^{}\mathrm{Ne}$(g.s.) is calculated using the optical model, including coupling through the 0+, 2+, and 4+ states in ${}_{}{}^{18}{}_{}{}^{}\mathrm{F}$. In addition to the analog, the 2+ and 4+ intermediate states are found to be quite important between 100 and 200 MeV. Good agreement is obtained with the experimental cross sections at 0°.

NUCLEAR REACTIONS ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}({\pi }^{+}, {\pi }^0)$ ${}_{}{}^{18}{}_{}{}^{}\mathrm{F}(\mathrm{lowest}T=1\mathrm{} \mathrm{levels})$, $T_{\pi }=139\mathrm{}$, ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}({\pi }^{+}, {\pi }^{-}){}_{}{}^{18}{}_{}{}^{}\mathrm{Ne}(\mathrm{g}.\mathrm{s}.\mathrm{})$ $T_{\pi }=100, 139, 187$. Calculated $\sigma \left(\theta \right)$.

• Received 17 February 1978

DOI:https://doi.org/10.1103/PhysRevC.18.1753