论文标题
Fe和Sn核的$（n，α）$反应横截面的同位素依赖性
Isotopic dependence of $(n,α)$ reaction cross sections for Fe and Sn nuclei
论文作者
论文摘要
$（n，α）$反应对于能量产生和恒星中化学元素的合成以及核工程和医学应用起着重要作用。这项研究的目的是探索Fe和SN同位素链中$（N，α）$反应的演变，以评估其特性，并与其他相关的中子引起的反应相比，并与其他相关的中子相比。横截面的模型计算基于TALYS实施中的统计Hauser-Feshbach模型，使用全球光学模型电位，该电位还由$（N，α）$横截面数据额外调整，用于$^{54} $ fe和$^{118} $ sn。 Fe和SN同位素中$（N，α）$反应的计算为其在完全相关的中子能量范围内的同胞依赖性和特性提供了见解。结果表明，在低质量同位素下，横截面具有明显的最大值的横截面的演变，并且与中子$ q $值的减少一致的富含中子中子的核的降低相当强，并且来自复合核的其他出口通道的贡献增加。恒星环境中温度下在温度下对麦克斯韦的平均横截面的分析表明，尽管$（n，α）$反应有助于低质量同位素，但在中子诱导的与中子过量的核反应中，$γ$和中子发射占主导地位。
The $(n,α)$ reactions play an important role for the energy generation and the synthesis of chemical elements in the stars, as well as for nuclear engineering and medical applications. The aim of this study is to explore the evolution of $(n,α)$ reactions in Fe and Sn isotope chains in order to assess their properties with the increase of neutrons in target nucleus, and compare with other relevant neutron induced reactions. Model calculations of the cross sections are based on the statistical Hauser-Feshbach model in TALYS implementation, using global optical model potential that is additionally adjusted by the $(n,α)$ cross section data for $^{54}$Fe and $^{118}$Sn. The calculations of $(n,α)$ reactions in Fe and Sn isotopes provide the insight into their isospin dependence and properties over the complete relevant range of neutron energies. The results show the evolution of the cross sections with pronounced maxima at low-mass isotopes, and rather strong decrease for neutron-rich nuclei consistent with the reduction of the reaction $Q$-value and increased contributions from other exit channels from compound nucleus. The analysis of the Maxwellian averaged cross sections at temperatures in stellar environment shows that while the $(n,α)$ reactions contribute for the low-mass isotopes, in neutron induced reactions with nuclei with neutron excess, $γ$ and neutron emission dominate.
