Multiparticle Photonuclear Reactions in the p-Process at Temperatures between 1 and 10 GK

The role of ( γ , 2 n ), ( γ , pn ), and ( γ , 2 p ) multiparticle photonuclear reactions in processes that lead to the nucleosynthesis of p -nuclides is considered. The library of rates of multiparticle photonuclear reactions that was developed for the temperature range between 1 and 10 GK and which is intended for use in stellar-evolution models and in calculations of nucleosynthesis is described. A simulation of the p -process in the course of an SN-IIa core-collapse event reveals that, within the scenario being considered, a dominant effect of multiparticle photonuclear reactions consists in enhancing the rate of photodisintegration of p -nuclides at temperatures above 6 to 7 GK.