Medium energy (40–65 MeV) γ rays following radiative capture of 50 MeV polarized protons on ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$ were studied for the first time by using a NaI detector ensemble with good energy resolution and small background counts. Discrete γ rays feeding the ground $0^{+}$, 4.44 MeV $2^{+}$, and 9.64 MeV $3^{\mathrm{-}}$ states, and prominent γ peaks feeding the 19 and 22 MeV excitations region in ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ were identified. The analyzing powers of the radiative capture were found to depend on the microscopic configurations of the final states.

• Received 24 February 1984

DOI:https://doi.org/10.1103/PhysRevC.31.242