期刊
PHYSICAL REVIEW C
卷 102, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.102.045804
关键词
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资金
- U.S. Department of Energy [DOE-DE-NA0002847]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [279384907 SFB 1245]
- Ministry of Science and Technology, Taiwan [107-2119-M-001-038, 108-2112-M-001-010]
- Physics Division of National Center for Theoretical Sciences
- MINECO [PGC2018-094583-B-I00]
- Yukawa Institute for Theoretical Physics in Kyoto [YITP-T-18-06]
We study the impact of fission on the production and destruction of translead nuclei during the r-process nucleosynthesis occurring in neutron-star mergers. Abundance patterns and rates of nuclear energy production are obtained for different ejecta conditions using three sets of stellar reaction rates, one of which is based on microscopic and consistent calculations of nuclear masses, fission barriers, and collective inertias. We show that the accumulation of fissioning material during the r process can strongly affect the free neutron abundance after the r-process freeze-out. This leads to a significant impact on the abundances of heavy nuclei that undergo a decay or spontaneous fission, affecting the radioactive energy production by the ejecta at timescales relevant for kilonova emission.
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