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The angular distributions of the differential cross sections and analyzing powers are presented for the /sup 12/C(p,..pi../sup +/)/sup 13/C( reaction leading to the ground state of /sup 13/C as well as some of the /sup 13/C( low-lying excited states. The analyzing powers for some of the transitions exhibit a considerable energy dependence while for other transitions they remain relatively unchanged, thus indicating a dynamic sensitivity of the analyzing power dependent on nuclear structure. Comparisons of theoretical predictions for A/sub N/0 and dsigma/d..cap omega.., based on microscopic two-nucleon models, with our results indicate that substantial differences between theory and experiment still exist for A(p,..pi../sup +/)A+1 type of reactions.

The analyzing power A/sub N0/ of the pp..--> pi../sup +/d reaction was measured to a statistical precision of better than +- 0.01 at incident proton beam energies of 375, 450, and 500 MeV, for center-of-mass angles from 20/sup 0/ to 150/sup 0/. The polarization-dependent differential cross sections were fit by associated Legendre functions (using published data for the shapes of the unpolarized differential cross sections). The energy dependence of the resulting b/sub k//sup N0/ coefficients were compared with existing data and theoretical expectations.