Differential cross sections of (${}_{}{}^3{}_{}{}^{}\mathrm{He}$, ${\pi }^{\pm }$) exclusive reactions have been measured for ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ targets at 235 MeV and 20° laboratory scattering angle. Several levels of the final nuclei have been observed for ${\pi }^{+}$ as well as ${\pi }^{-}$ production. Simple assumptions for the reaction mechanism are considered for explaining the ratio of ${\pi }^{-}$ to ${\pi }^{+}$ production.

• Received 24 April 1984

DOI:https://doi.org/10.1103/PhysRevC.30.739