^(94)Zr中子谱因子的实验研究  

Experimental study of the neutron spectroscopic factor of ^(94)Zr

作　　者：甘林[1,2] 李志宏[1] 李云居[1] 苏俊[1] 颜胜权[1] 郭冰[1] 杜先超 吴志丹[1] 曾晟[1] 金孙均[1] 连钢[1] 刘建成[1] 李志常[1] 王友宝[1] 白希祥[1] 张伟杰[1] 柳卫平[1] 孙慧斌[2] 李二涛[2] 

机构地区：[1]中国原子能科学研究院,北京102413 [2]深圳大学,深圳518060

出　　处：《核技术》2015年第5期74-77,共4页Nuclear Techniques

基　　金：国家自然科学基金(No.11321064;No.11375269;No.11105228);国家重点基础研究发展规划973项目(No.2013CB834406)资助

摘　　要：94Zr的中子谱因子可用于研究93Zr(n,γ)94Zr直接辐射俘获反应的激发函数和天体物理反应率,对研究s-过程的核合成有重要意义。现有的94Zr中子谱因子实验结果仍存在较大的差异。本工作在北京HI-13串列加速器Q3D磁谱仪上测量了12C+94Zr、13C+94Zr弹性散射反应及94Zr(12C,13C)93Zr单中子转移反应的角分布。通过对弹性散射角分布的仔细分析,拟合出了入射道和出射道的光学势参数,并结合扭曲波玻恩近似(Distorted wave Born approximation,DWBA)理论对转移反应的微分截面进行了理论分析,提取出94Zr的中子谱因子为2.60±0.20。Background： The slow neutron capture （s-） process plays a very important role in the nucleosynthesis, which produces about half of the elements heavier than iron. 94Zr is mainly from 93Zr（n,γ）94Zr in the s-process, and can be used to study the s-process. And the direct component of the 93Zr（n,γ）94Zr capture reaction can be derived from the neutron spectroscopic factors of 94Zr. Purpose： As the existing neutron spectroscopic factors of 94Zr differ from each other up to 60%, a new work should be adopted to measure them exactly. Methods： In the present work, the angular distribution of 94Zr（13C,13C）94Zr, 94Zr（12C,12C）94Zr and 94Zr（12C,13C）93Zr were obtained using the high-precision Q3D magnetic spectrograph. In addition, distorted-wave Born approximation （DWBA） calculations of the transfer differential cross sections were performed. Results： The calculated result was in good agreement with the experiment data, and a value of 2.60±0.20 for the neutron spectroscopic factor of 94Zr was extracted. Conclusion： With the neutron spectroscopic factor of 94Zr obtained in the work, the direct component of the 93Zr（n,γ）94Zr reaction can be derived in the near future.

关 键 词：单中子转移反应 扭曲波玻恩近似理论 中子谱因子 

分 类 号：TL99[核科学技术—核技术及应用]