Empirical Solar Abundance Scalings of Supernova Gamma-Process Isotopes

Analyzing the solar system abundances, we have found two empirical scaling laws concerning the pand s-nuclei with the same atomic number. These scalings are evidence that most probable origin of 27 p-nuclei is the supernova γ-process. We have calculated the abundance ratios by the γ-process nucleosynthesis based on core-collapse supernova explosion models under various astrophysical conditions. The results show that the scalings hold for materials produced by individual γ-processes independent of the astrophysical conditions assumed. We also discuss the origin of the other 8 p-nuclei.