A new measurement of the ${}^{75}\mathrm{As}$($n,2n$) measurement was performed using the 14.1 MeV neutron pulse produced by fusion experiments at the National Ignition Facility (NIF). The target material consisted of GaAs foils encapsulated in aluminum irradiation containers, along with Au monitor foils, and positioned in the NIF chamber during high neutron yield shots. After irradiation, the GaAs and Au foils were counted with high purity germanium detectors to assess the production of ($n,2n$) activation products to determine the flux and the cross section of interest. The measured cross section was $966\pm 71$ mb at $14.1\pm 0.37$ MeV. This work provides a proof of concept for a platform for performing “ride-along” cross section measurements at NIF to contribute to existing nuclear data as well as measure new cross sections in the future.

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• Knockout reactions
• Transfer reactions
• 59 ≤ A ≤ 89
• Nuclear data analysis & compilation