Measurements of ⁹²Mo(p,γ)⁹³Tc and ⁹⁴Mo(p,γ)⁹⁵Tc cross sections

When modeling the γ-process a consistent underproduction of the lighter p-nuclei molybdenum and ruthenium has been observed. Past measurements of the 92Mo(p,γ)93Tc cross section showed the possibility of irregularities within the Gamow window, which deviate from the smooth cross sections predicted by Hauser-Feschbach based models. Since deviations from a smooth energy dependence of the cross section within the Gamow window could have a strong effect on the reaction rates, a detailed scan of the cross section for both the ⁹²Mo(p,γ)⁹³Tc and the ⁹⁴Mo(p,γ)⁹⁵Tc reactions was performed at the University of Notre Dame’s Nuclear Science Laboratory using the High EfficienCy TOtal absorption spectrometeR (HECTOR) and the 5U 5 MV single-ended accelerator over the energy range Ep = 1.4–4.4 MeV. The data was analyzed using the γ-summing technique. For the energy range where the sum-peak overlaps with possible contaminants, we developed a new method to separate those from true energy-sum events originating from the Mo targets. Here, this new method, preliminary cross section results, and network calculations performed using the new reactions rates will also be shown.