2025/11/25 by Tsantiri, A., Spyrou, A., Good, E. C. +42
#FOS: Physical sciences #Nuclear Experiment (nucl-ex)
paper · doi:10.48550/arxiv.2511.20850
We provide the first experimental cross section of the 73As(p,γ)74Se reaction to constrain one of the main destruction mechanisms of the p nucleus 74Se in explosive stellar environments. The measurement was done using a radioactive 73As beam at effective center-of-mass energies of 2.9 and 2.3 MeV/nucleon. Along with the total cross-section measurement, statistical properties of the 74Se compound nucleus were extracted, constraining the reaction cross section in the upper Gamow window of the γ process. The impact of the experimentally constrained reaction rate on 74Se production in Type II supernovae was investigated through Monte Carlo one-zone network simulations. The results indicate that the overproduction of 74Se by Type II supernova models cannot be resolved by nuclear physics alone and point toward the need for a more detailed understanding of the astrophysical conditions of relevance for the γ process.