Cross-section measurements for neutron-induced reactions on GaAs have been carried out at twelve different neutron energies from 7.5 to 15 MeV using the activation technique. The monoenergetic neutron beams were produced via the ${}^2\mathrm{H}$($d,n$)${}^3\mathrm{He}$ reaction. GaAs samples were activated along with Au and Al monitor foils to determine the incident neutron flux. The activities induced by the reaction products were measured using high-resolution $\gamma$-ray spectroscopy. Cross sections for five reaction channels, viz., ${}^{69}\mathrm{Ga}$($n,2n$)${}^{68}\mathrm{Ga}$, ${}^{69}\mathrm{Ga}$($n,p$)${}^{69}\mathrm{Zn}$${}^m$, ${}^{71}\mathrm{Ga}$($n,p$)${}^{71}\mathrm{Zn}$${}^m$, ${}^{75}\mathrm{As}$($n,2n$)${}^{74}\mathrm{As}$, and ${}^{75}\mathrm{As}$($n,p$)${}^{75}\mathrm{Ge}$, are reported. The results are compared with the previous measurements and available data evaluations. Statistical-model calculations, based on the Hauser-Feshbach formalism, have been carried out using the TALYS and the COH3 codes and are compared with the experimental results.

• Received 10 February 2011

DOI:https://doi.org/10.1103/PhysRevC.83.044621