A measurement of the thermal neutron capture cross section of ${}^{73}\mathrm{As}$ (${\mathrm{t}}_{1/2}=80.3$ d) was performed utilizing the University of Missouri Research Reactor. Two sealed quartz tubes containing ${}^{73}\mathrm{As}$ were prepared and characterized before being irradiated for $\approx 1$ week. The resulting production of ${}^{74}\mathrm{As}$ was quantified with γ-ray spectroscopy. Monitor foils of Fe, Zr, and Mo were irradiated alongside the ${}^{73}\mathrm{As}$ samples to assess the thermal and resonance region neutron fluxes. The thermal ${}^{73}\mathrm{As}(n,\gamma )$ cross section was determined to be $56.1\pm 8.9$ b based on the average of the two ${}^{73}\mathrm{As}$ samples and represents the first neutron-induced reaction cross section measured on ${}^{73}\mathrm{As}$.

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• Nuclear structure & decays
• Nucleon induced nuclear reactions
• Radiative capture
• 59 ≤ A ≤ 89