Comparison of theC13(d, α)B11andB11(He3, p)C13Reactions

Abstract

Angular distributions have been measured for ${\mathrm{C}}^{13}(d, \ensuremath{\alpha}){\mathrm{B}}^{11}$ (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\ifmmode^\circ\else\textdegree\fi{}, 84\ifmmode^\circ\else\textdegree\fi{}, 119\ifmmode^\circ\else\textdegree\fi{}, and 154\ifmmode^\circ\else\textdegree\fi{}. 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\ifmmode^\circ\else\textdegree\fi{} and 140\ifmmode^\circ\else\textdegree\fi{}. 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 ${\mathrm{C}}^{13}(d, \ensuremath{\alpha}){\mathrm{B}}^{11}$ data are fitted using Legendre polynomials in $cos\ensuremath{\theta}$. 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.