Nucleosynthesis of Light Elements and Heavy r-Process Elements through the ν-Process in Supernova Explosion

We study the nucleosyntheses of the light elements Li and B and the rprocess elements in Type II supernovae in the lights of the progress in neutrino spectrum modeling and the studies of galactic chemical evolution. We investigate the influence of total energy, Eν , and decay time, τν of supernova neutrinos on these two nucleosynthesis processes. Common models of the neutrino spectra are adopted in order to look for unified neutrino spectrum modeling for both processes. We adopt the model of the supernova explosion of a 16.2 M⊙ star, which corresponds to SN 1987A, and study the nucleosynthesis of the light elements by the postprocessing. We find that the ejected masses of Li and B are roughly proportional to the total energy of supernova neutrinos and weakly dependent on the decay time of the neutrino luminosity. As for the r-process nucleosynthesis, we adopt the same models of neutrino spectra in the neutrino-driven wind models of a neutron star with the mass of 1.4M⊙. We find that the r-process nucleosynthesis is affected through the peak neutrino luminosity. The observed r-process abundance pattern is better reproduced in low total neutrino energy and long Present address: Department of Astronomy, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan, E-mail: [email protected] Present address: Center for Nuclear Study, Graduate School of Science, University of Tokyo, Hirosawa, Wako, Saitama 351-0198, Japan