镓样品泄漏中子谱的测量与分析

基于中国原子能科学研究院的中子学积分实验装置，利用BC501A液体闪烁体探测器，结合飞行时间法（TOF）测量了镓样品的泄漏中子谱。采用MCNP 4C程序进行了模拟并与实验泄漏中子谱进行了比较，对ENDF/B-Ⅶ.1、JEFF-3.2、TENDL-2015数据库中镓核中子评价数据进行了宏观基准检验分析，并与TALYS程序计算结果作对比。研究结果显示：在9 MeV以下能区，TENDL-2015库与实验结果符合很好；在弹性散射能区，JEFF-3.2和TENDL-2015库与实验结果符合较好；对于12 MeV左右的非弹性散射峰，JEFF-3.2库与实验结果符合较好，TALYS计算结果显示该部分主要来自镓核分离能级的贡献。

Measurement and Analysis of Leakage Neutron Spectrum from Gallium Sample

Based on the neutronics integral experimental setup at China Institute of Atomic Energy, the leakage neutron spectra from gallium samples were measured by time-of-flight technique with a BC501A scintillation detector. For the benchmark analysis of the neutron evaluated nuclear data of gallium, the leakage neutron spectra were simulated by MCNP 4C code with the ENDF/B-Ⅶ.1, JEFF-3.2 and TENDL-2015 evaluated nuclear data libraries and compared with experimental data and TALYS code calculated results. The results show that the measured data are well reproduced by simulation with the TENDL-2015 library below the 9 MeV. The calculation results of JEFF-3.2 and TENDL-2015 libraries give better agreement with the measured data in the elastic scattering energy region. For the inelastic scattering peak around 12 MeV, JEFF-3.2 library shows a better agreement with the measured data, and TALYS results indicate that the contribution of discrete levels is dominated contribution.