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Evidence for nucleosynthesis in the supernova gamma process: universal scaling for p nuclei
T Hayakawa1, N Iwamoto, T Shizuma
1Advanced Photon Research Center, Japan Atomic Energy Research Institute, Kizu, Kyoto 619-0215, Japan.
Physical Review Letters
|November 5, 2004
Summary
Supernova explosions likely create p-nuclei, heavy elements crucial for understanding cosmic origins. This study reveals universal scaling laws supporting the gamma process as their primary source, introducing a new cosmic clock.
Area of Science:
- Nuclear astrophysics
- Cosmology
- Stellar evolution
Background:
- The origin of p-nuclei, a group of rare heavy isotopes, remains a long-standing puzzle in nuclear astrophysics.
- Previous theories proposed various nucleosynthesis sites and reactions, but lacked definitive evidence.
Purpose of the Study:
- To investigate the origin of p-nuclei by analyzing their abundance patterns in the solar system.
- To test the hypothesis that the gamma-process in supernova explosions is the primary production mechanism for p-nuclei.
Main Methods:
- Analysis of solar system abundances of p-nuclei and s-nuclei.
- Development and application of universal scaling laws derived from abundance data.
- Nucleosynthesis calculations simulating the gamma-process in core-collapse supernova models.
Main Results:
- Two universal scaling laws for p- and s-nuclei were identified, strongly supporting the gamma-process in supernovae as the origin of p-nuclei.
- The proposed scaling laws suggest a universality of the gamma-process across different astrophysical environments.
- A new nuclear cosmochronometer based on these findings was conceptualized.
Conclusions:
- The gamma-process occurring during supernova explosions is the most probable origin for p-nuclei.
- The identified scaling laws provide a robust framework for understanding p-nuclei production.
- The study introduces novel concepts for the gamma-process and a new tool for cosmic age determination.