Angular distributions have been measured for ${\mathrm{C}}^{13}(d, \alpha ){\mathrm{B}}^{11}$ (ground state) at 3.35, 3.55, 3.85, and 4.20 MeV. Differential excitation functions for this reaction were measured in 100-keV intervals over the 3.1- to 4.2-MeV region at 54°, 84°, 119°, and 154°. Angular distributions for the ${\mathrm{B}}^{11}({\mathrm{He}}^3, p){\mathrm{C}}^{13}$ (ground state) reaction have been measured at 8.6, 9.6, and 10.3 MeV. Differential excitation functions were measured in 200-keV intervals over the 8.0- to 11.0-MeV region at 35° and 140°. The two reactions studied are related in that both involve the transfer of a deuteron between ${\mathrm{B}}^{11}$ and ${\mathrm{C}}^{13}$ in a common momentum transfer region. Notwithstanding, the two reactions appear to proceed predominantly by different mechanisms, viz. compound-nucleus formation and direct process, respectively. The ${\mathrm{C}}^{13}(d, \alpha ){\mathrm{B}}^{11}$ data are fitted using Legendre polynomials in $cos\theta$. The forward portions of angular distributions of ${\mathrm{B}}^{11}({\mathrm{He}}^3, p){\mathrm{C}}^{13}$ are fitted using two versions of the plane-wave Born approximation theory.

• Received 14 February 1963

DOI:https://doi.org/10.1103/PhysRev.130.2373