Differential cross sections for $\alpha$ particles to the ground and first excited states of ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ in the reaction ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}(n,\alpha ){}_{}{}^7{}_{}{}^{}\mathrm{Li}$ have been calculated from $R$-matrix parameters that fit neutron elastic scattering, neutron polarization, and ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}(n,\alpha ){}_{}{}^7{}_{}{}^{}\mathrm{Li}$ reaction data. It is pointed out that a measurement of these $\alpha$-particle angular distributions could resolve some of the ambiguities that remain in the interpretation of the ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}(n,\alpha ){}_{}{}^7{}_{}{}^{}\mathrm{Li}$ reaction for neutron energies below 1 MeV.

• Received 31 August 1971

DOI:https://doi.org/10.1103/PhysRevC.5.277