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arXiv 1604.06757nucl-thastro-ph.SR
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$N=50$壳层封闭域中与s过程和p过程有关的中子俘获反应

Neutron capture reactions relevant to s-process and p-process in the domain of the $N=50$ shell closure

Saumi Dutta, G. Gangopadhyay, Abhijit Bhattacharyya

摘要:

在天体物理感兴趣的能量范围内,用统计半微观Hauser-Feshbach方法计算了在$N=50$封闭中子壳层内和周围参与s过程和p过程核合成的核的辐射热中子俘获截面.利用标准DDM 3 Y实核子-核子相互作用构造了一个折叠光学模型势。折叠的相互作用与目标径向物质密度,从相对论平均场的方法,是在坐标空间中使用球近似。截面计算采用标准的核反应程序TTRIS 1.8。的截面与实验结果进行了比较,发现几乎所有的情况下,合理的协议。给出了与s过程相关的30 keV单次热能下的麦克斯韦平均截面(MACS)。我们还给出了含$(N=50)$的中子幻核在5 ~ 100 keV能量范围内的MACS值。

英文摘要:

Radiative thermal neutron capture cross sections for nuclei participating in s-process and p-process nucleosynthesis in and around $N=50$ closed neutron shell have been calculated in statistical semi-microscopic Hauser-Feshbach approach for the energy range of astrophysical interest. A folded optical model potential is constructed utilizing the standard DDM3Y real nucleon-nucleon interaction. The folding of the interaction with target radial matter densities, obtained from the relativistic-mean-field approach, is done in coordinate space using the spherical approximation. The standard nuclear reaction code TALYS1.8 is used for cross-section calculation. The cross sections are compared with experimental results and reasonable agreements are found for almost all cases. Maxwellian-averaged cross sections (MACS) for the nuclei are presented at a single thermal energy of 30 keV relevant to s-process. We have also presented the MACS values over a range of energy from 5 to 100 keV for neutron magic nuclei with $(N=50)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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