Differential cross sections and analyzing powers for the ($\overrightarrow{p}$,${\pi }^{+}$) reaction have been measured with 147- to 159-MeV polarized protons. Transitions to the ground, 2.12-, and 4.45-MeV states in ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$, the ground, 3.09-, and (3.68-3.85)-MeV doublet in ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$, the ground and 0.87-MeV state in ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$, and the ground state in ${}_{}{}^{14}{}_{}{}^{}\mathrm{Ca}$ are studied. Pion center-of-mass energies range from 5 to 11 MeV. The results show distinct differences of the ($\overrightarrow{p}$,${\pi }^{+}$) analyzing power for the various transitions.

NUCLEAR REACTIONS ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$($\overrightarrow{p}$,${\pi }^{+}$), polarized protons, $E_p=147-159\mathrm{}$ MeV; measured $\sigma \left(\theta \right)$, $A\left(\theta \right)$.

• Received 20 April 1981

DOI:https://doi.org/10.1103/PhysRevC.24.1135