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Evidence for p-process nucleosynthesis recorded at the Solar System abundances

  • T. HayakawaEmail author
  • N. Iwamoto
  • T. Shizuma
  • T. Kajino
  • H. Umeda
  • K. Nomoto
Nuclear Physics in Astrophysics II
  • 368 Downloads

Abstract.

Analyzing the Solar System abundance, we have found two universal scaling laws concerning the p- and s-nuclei with the same atomic number. They are evidence of the p-nucleus origin that has been discussed for long years. The first scaling is the correlation of the isotope abundances between a p-nucleus and an s-nucleus that is two neutron heavier than the p-nucleus. The abundance ratios of the s-nucleus to the p-nucleus are almost constant in a wide range of atomic numbers. This scaling indicates that the p-nucleus is dominantly produced from the s-nucleus by (γ, n) reactions in huge photon bath in supernova explosions. The second scaling indicates that the isotope abundance ratio between two p-nuclei with the same atomic number is almost unity. These two scalings are a new useful method to verify nucleosynthesis models for the p-process. We have calculated these ratios by a p-process nucleosynthesis based on a typical core-collapse supernova explosion model. The results are consistent with the scaling in the solar abundances. In addition, the scalings provide new concepts: a universality of the p-process, a rate meter for the s-process and a new nuclear cosmochronometer.

PACS.

26.30.+k Nucleosynthesis in novae, supernovae and other explosive environments 98.80.Ft Origin, formation, and abundances of the elements 91.65.Dt Isotopic composition/chemistry 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2006

Authors and Affiliations

  • T. Hayakawa
    • 1
    Email author
  • N. Iwamoto
    • 2
  • T. Shizuma
    • 1
  • T. Kajino
    • 3
  • H. Umeda
    • 4
  • K. Nomoto
    • 4
  1. 1.Advanced Photon Research CenterJapan Atomic Energy Research InstituteKizu, KyotoJapan
  2. 2.Department of Nuclear Energy SystemJapan Atomic Energy Research InstituteTokaiJapan
  3. 3.National Astronomical ObservatoryMitaka, TokyoJapan
  4. 4.Department of Astronomy, School of ScienceUniversity of TokyoTokyoJapan

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