Influence of Spontaneous Fission Rates on the r-process Nucleosynthesis
Influence of Spontaneous Fission Rates on the r-process Nucleosynthesis
复制标题
自发裂变速率对 r 过程核合成的影响
DOI:
10.3847/1538-4357/ac6fdc
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发表时间:
2022-06
期刊:
影响因子:
--
通讯作者:
Z. M. Niu
中科院分区:
文献类型:
--
作者:
Y. W. Hao;Y. F. Niu;Z. M. Niu
Abstract The effects of spontaneous fission on r -process nucleosynthesis are investigated in the hot wind r -process scenario. We perform network calculations using three sets of spontaneous fission rates to study how the abundance pattern is shaped when different sets of fissioning nuclei are encountered by the r -process nuclear flow. The relative contributions from spontaneous fission, neutron-induced fission, and β -delayed fission to the nucleosynthesis process are studied by calculating the corresponding fission flow. We show that the relative contributions of various fission channels in r -process nucleosynthesis depend on the astrophysical conditions and fission models used. By using the spontaneous fission rates from a modified Swiatecki’s formula with isospin and blocking effects, the spontaneous fission and neutron-induced fission play an equally important role in r -process nucleosynthesis under an extreme neutron-rich astrophysical scenario with Y e = 0.1. The fissioning nuclei are located in different regions of the nuclear chart when different spontaneous fission models are used. The fission fragment distributions of fissioning nuclei in different regions have apparent diversity, which affects the mass regions where fission products are deposited, leading to the difference of the final abundance around the second r -process peak and rare-earth subpeak.
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DOI:
10.1016/j.nuclphysa.2009.10.160
发表时间:
2010-01
期刊:
Nuclear Physics
影响因子:
--
作者:
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通讯作者:
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DOI:
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发表时间:
2019-11
期刊:
The Astrophysical Journal
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1998-08
期刊:
The Astrophysical Journal
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通讯作者:
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发表时间:
1999-11
期刊:
The Astrophysical Journal Letters
影响因子:
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通讯作者:
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影响因子:
3.7
作者:
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通讯作者:
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