摘要: 多个Sn同位素位于慢速中子俘获（s-）过程路径上，其中子谱因子可用于计算^ASn（n，γ） ^A+1Sn直接辐射俘获的天体物理反应率，并可研究Sn同位素对s-过程核合成的贡献。本工作在中国原子能科学研究院HI-13串列加速器Q3D磁谱仪上，对实验室系下8°~66°范围内的122，¹²⁴Sn（d，p）和（p，d）单中子转移反应角分布进行了测量。利用DWBA理论计算了转移反应角分布，并提取了^122-125Sn的基态以及^123，125Sn第一激发态的中子谱因子。其中，¹²²Sn和¹²⁴Sn的基态中子谱因子是首次从实验上获得。由于本工作成功鉴别开了^123，125Sn的基态和第一激发态的效应，因此给出的谱因子比前人的结果更可信。


Several Tin isotopes are on the path of slow neutron capture (s-) process, and the direct components of (n, γ) reactions can be derived from their neutron spectroscopic factors. In the present work, the angular distributions of ^122,124Sn(p, d) and (d, p) reactions are obtained using the high-precision Q3D magnetic spectrograph in Beijing HI-13 tandem accelerator in China Institute of Atomic Energy. The distorted-wave Born approximation (DWBA) calculations are performed to extract the neutron spectroscopic factors of the ground state of ^122-125Sn and the first excited state of ^123,125Sn. The neutron spectroscopic factors of the ground state of ¹²²Sn and ¹²⁴Sn are firstly obtained in this work. As the events of the ground state and first excited state of ^123,125Sn can be distinguished clearly by our experiment, the neutron spectroscopic factories of ^123,125Sn are more reliable.