中子入射n+Ga～（67，71，Nat）反应截面的理论计算

【作者】 毕臻；

【导师】 孙秀泉；

【作者基本信息】 西北大学 ， 理论物理， 2004， 硕士

【摘要】 本文利用光学模型、复合核反应理论（Hauser-Feshbach理论）、激子模型、扭曲波恩近似等核反应理论模型，对能量在0.01-20MeV间的中子入射n+Ga^{69，71，Nat}的反应截面进行了理论计算。首先，对n+Ga^69，71反应的实验数据进行了分析，在此基础上利用APOM程序自动调节中子光学势参数程序，得到了一组相应的中子光学势参数。在上述中子光学势参数的基础上，对能量在0.01-20MeV间的中子入射Ga^69，71的反应截面进行了理论计算及分析。结果表明，理论值与实验值符合很好，理论模型是成功的。另外本文在基于对丰度分别为：60.108％和39.892％的核素Ga⁶⁹和Ga⁷¹理论计算的基础上，对中子入射天然核Ga^Nat的反应截面的理论计算进行了研究和探索，但有待于进一步完善。在计算中，为了保证整个反应过程的能量守恒，我们严格考虑了反冲核效应的影响。计算结果分析表明，理论值与实验值符合得很好，利用文中给出的理论参数，可以运用光学模型、Hauser-Feshbach理论和激子模型理论从理论上预言核反应，并给出了可供核装置设计应用的B6格式的全套微观数据。更多还原

【Abstract】 All cross sections neutron induced reaction elastic scattering angular distribution, neutron energy spectrum and double differential cross sections of n+Ga69,71,Nat were calculated and analyzed by using optical model and the semi-classical model of multi-step nuclear reaction processes based on the Hauser-Feshbach theory and the exciton model in the energy region up to 20MeV. A set of optimal neutron optical potential parameters are obtained by the code APOM for n+Ga69,71 reaction based on the experimental data of total, non-elastic cross sections and elastic scattering distribution. The abundance of the each isotopes should be considered in calculating the reaction of n+GaNat. Since the recoil effect is taken into account, the energy for whole reaction processes is balance. The calculated results indicate that the theoretical results which have been compared with experimental data are in good agreement with existed experimental data, and it is successful to predict nuclear reaction by using optical model and the semi-classical model of multi-step nuclear reaction processes in theory.Bi zhen ( Theoretical Physics) Directed by Professor Sun xiu-quan更多还原