Angular distributions are given for the ground state and first three excited states of ${\mathrm{B}}^{11}$ following the ${\mathrm{C}}^{14}(p, \alpha ){\mathrm{B}}^{11}$ reaction at an incident proton energy of 18.0 MeV. The results suggest a direct-interaction reaction mechanism but are not in agreement with the simple plane-wave theory for this mechanism.

• Received 29 May 1962

DOI:https://doi.org/10.1103/PhysRev.128.790