Influence of Spontaneous Fission Rates on the r-process Nucleosynthesis

Influence of Spontaneous Fission Rates on the r-process Nucleosynthesis
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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:
The Astrophysical Journal
影响因子:
--
通讯作者:
Z. M. Niu
Z. M. Niu
中科院分区:
其他
文献类型:
--
作者:
Y. W. Hao;Y. F. Niu;Z. M. Niu

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摘要本文研究了在热风r过程情景下,自发裂变对r过程核合成的影响.我们使用三组自发裂变率进行网络计算,以研究当r -过程核流遇到不同的裂变核时,丰度模式是如何形成的。通过计算相应的裂变流,研究了自发裂变、中子诱发裂变和β延迟裂变对核合成过程的相对贡献。我们表明,各种裂变通道在r过程核合成中的相对贡献取决于所用的天体物理条件和裂变模型。利用修正的Swiatecki公式,考虑到同位旋和阻塞效应,计算了自发裂变率,发现在Ye = 0.1的极端丰中子天体物理情景下,自发裂变和中子诱发裂变在r过程核合成中起着同等重要的作用.当使用不同的自发裂变模型时,裂变核位于核图的不同区域。不同区域裂变核的裂变碎片分布具有明显的差异性,影响了裂变产物沉积的质量区域,导致第二r过程峰和稀土次峰附近的最终丰度存在差异。
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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