Tc cross sections for γ-process modeling*

When modeling the p-nuclei abundances through the γ-process a consistent underproduction of the lighter p-nuclei, molybdenum and ruthenium, has been observed. Additionally, past measurements of the ⁹²Mo(p,γ)⁹³Tc cross section showed the possibility of resonance structures within the energy range relevant to the γ-process, which deviate from the smooth cross sections predicted in Hauser-Feschbach based models used in the modelling. In order to investigate this we measured both the ⁹²Mo(p,γ)⁹³Tc and the ⁹⁴Mo(p,γ)⁹⁵Tc cross sections at the University of Notre Dame’s Nuclear Science Laboratory. The High EfficienCy TOtal absorption spectrometeR (HECTOR) was used as well as the 5U 5 MV single-ended accelerator to measure the cross sections over the range Ep = 1.4–4.4 MeV. Various structures were observed in the ⁹²Mo(p,γ)⁹³Tc cross section and preliminary results for both measurements will be discussed.