2023/07/06 by Hirokazu Sasaki, Sasaki, Hirokazu, Yuta Yamazaki +5 · 2 citations
Physics and Astronomy · #Gamma-ray bursts and supernovae #Nuclear physics research studies #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.2307.02785
The partcle-induced hadronic de-excitation of the Hoyle state in 12C induced by inelastic scattering in a hot and dense plasma can enhance the triple-alpha reaction rate. This prevents the production of heavy nuclei within the neutrino-driven winds of core-collapse supernovae and raises a question as to the contribution of proton-rich neutrino-driven winds as the origin of p-nuclei in the solar system abundances. Here we study νp-process nucleosynthesis in proton-rich neutrino-driven winds relevant to the production of 92,94Mo and 96,98Ru by considering such particle-induced de-excitation. We show that the enhancement of the triple-alpha reaction rate induced by neutron inelastic scattering hardly affects the νp-process, while the proton scattering contributes to the nucleosynthesis in proton-rich neutrino-driven winds at low temperature. The associated enhanced triple-alpha reaction rate decreases the production of 92,94Mo and 96,98Ru in a wind model of ordinary core-collapse supernovae. On the other hand, the abundances of these p-nuclei increase in an energetic hypernova wind model. Hence, we calculate the galactic chemical evolution of 92,94Mo and 96,98Ru by taking account of both contributions from core-collapse supernovae and hypernovae. We show that the hypernova νp-process can enhance the calculated solar isotopic fractions of 92,94Mo and 96,98Ru and make a significant impact on the GCE of p-nuclei regardless of the particle-induced Hoyle state de-excitation.