title: Evidence for nucleosynthesis in the supernova gamma process: universal scaling for p nuclei.
abstract: Analyzing the solar system abundance, we find two universal scaling laws concerning the p and s nuclei. They indicate that the gamma process in supernova (SN) explosions is the most probable origin of the p nuclei that has been discussed with many possible nuclear reactions and sites in about 50 years. In addition, the scalings lead to new concepts: a universality of the gamma process and a new nuclear cosmochronometer. We carry out gamma-process nucleosynthesis calculations for typical core-collapse SN explosion models, and the results satisfy the observed scalings.
authors.affiliation: Advanced Photon Research Center, Japan Atomic Energy Research Institute, Kizu, Kyoto 619-0215, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Hayakawa
authors.forename: N
authors.initials: N
authors.lastname: Iwamoto
authors.forename: T
authors.initials: T
authors.lastname: Shizuma
authors.forename: T
authors.initials: T
authors.lastname: Kajino
authors.forename: H
authors.initials: H
authors.lastname: Umeda
authors.forename: K
authors.initials: K
authors.lastname: Nomoto