Role of thermal and photobeta decays in processes of nucleosynthesis of problematic p nuclei of 113In, 115Sn, 92,94Mo, and 96,98Ru in massive stars

The temperature dependence of the rates of 113Cd →113In, 115In →115Sn, 92Zr→92Nb →92Mo, 94Zr→94Nb →94Mo, 96Mo →96Tc→96Ru, and 98Mo→98Tc→98Ru thermal beta transitions was studied at temperatures of massive-star matter in the range of 1 × 108–6 × 109 K. These decays are the possible channel of synthesis of the p nuclei of 113In, 115Sn, 92,94Mo, and 96,98Ru. The abundances of these nuclei present a challenge for models that study the explosivemechanism of synthesis. The contribution of photobeta decay to the synthesis of the aforementioned p nuclei was estimated. It was shown that the channel of thermal beta decay for 113In, 115Sn, 94Mo, and 98Ru p nuclei and the channel of photobeta decay for the 96Mo p nucleus could be efficient at the high-temperature quasiequilibrium stage of massive-star evolution.