Cross sections for $\gamma$ rays produced by neutron bombardment of ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ have been measured between 50 keV and 5 MeV and at 14.8 MeV. Special emphasis was placed on measurements of the 0.478-MeV $\gamma$ ray from the ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}(n, \alpha ){}_{}{}^7{}_{}{}^{}\mathrm{Li}$ reaction. Most of the unbound levels in ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ did not emit any observable $\gamma$ rays. The 0.478-MeV $\gamma$-ray production cross section showed a departure from $\frac{1}{v}$ above a neutron energy of 100 keV.

• Received 4 June 1969

DOI:https://doi.org/10.1103/PhysRevC.1.847