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ν-Process Nucleosynthesis in Population III Core-Collapse Supernovae

We investigate the effects of neutrino-nucleus interactions (the ν-process) on the production of iron-peak elements in Population III core-collapse supernovae. The ν-process and the following proton and neutron capture reactions produce odd-Z iron-peak elements in the complete and incomplete Si-burning region. This reaction sequence enhances the abundances of Sc, Mn, and Co in the supernova ejecta. Supernova explosion models of 15 and 25 M☉ stars with the ν-process reproduce well the average Mn/Fe ratio observed in extremely metal-poor halo stars. In order to reproduce the observed Mn/Fe ratio, the total neutrino energy in the supernovae should be (3–9) × 1053 ergs. Stronger neutrino irradiation and other production sites are necessary to reproduce the observed Sc/Fe and Co/Fe ratios, although these ratios increase by the ν-process.