Measurements of the dependence on incident proton energy of the analyzing power $A_y\left(\theta \right)$ for $\overrightarrow{p}{\pi }^{-}$ production on nuclei are reported for the ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$($\overrightarrow{p}$,${\pi }^{-}$)${}_{}{}^{10}{}_{}{}^{}\mathrm{C}$ reaction leading to the ground state (g.s.) and the first three excited states of ${}_{}{}^{10}{}_{}{}^{}\mathrm{C}$. For the transition to the g.s. the analyzing power shows little dependence on proton energy while for transitions leading to the ${}_{}{}^{10}{}_{}{}^{}\mathrm{C}_{3.35}^{}{}_{}{}^{}$* and ${}_{}{}^{10}{}_{}{}^{}\mathrm{C}_{6.60}^{}{}_{}{}^{}$* states it varies considerably with incident proton energy. Nuclear structure dependence of the $A_y\left(\theta \right)$ is also observed for the first time in $\overrightarrow{p}{\pi }^{-}$ reactions.

NUCLEAR REACTIONS ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$($\overrightarrow{\mathrm{p}}$, ${\pi }^{-}$)${}_{}{}^{10}{}_{}{}^{}\mathrm{C}$ measured $A_y\left(\theta \right)$ for ${}_{}{}^{10}{}_{}{}^{}\mathrm{C}_{\mathrm{g}.\mathrm{s}.\mathrm{}}^{}{}_{}{}^{}$, ${}_{}{}^{10}{}_{}{}^{}\mathrm{C}_{3.35}^{}{}_{}{}^{}$*, ${}_{}{}^{10}{}_{}{}^{}\mathrm{C}_{5.28}^{}{}_{}{}^{}$* and ${}_{}{}^{10}{}_{}{}^{}\mathrm{C}_{6.60}^{}{}_{}{}^{}$* transitions; $E_{\overrightarrow{\mathrm{p}}}=200, 225, 250$ MeV; calculated $Y_0\left(\theta \right)$.

• Received 15 June 1981

DOI:https://doi.org/10.1103/PhysRevC.25.1082