Production of Positive Pions from the Bombardment ofBe9andC12with 200-MeV Polarized Protons

Differential cross sections and analyzing power for reactions ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}(p,{\pi }^{+})$ and ${}_{}{}^9{}_{}{}^{}\mathrm{Be}(p,{\pi }^{+})$ leading to discrete final states in the residual nuclei have been measured in the angular range from 35° to 135° using 200-MeV polarized protons. The shape of the angular distribution of analyzing powers is essentially independent of the residual nuclear state, indicating a strong dependence upon reaction mechanism rather than nuclear structure.