镓样品泄漏中子谱的测量与分析

Measurement and Analysis of Leakage Neutron Spectrum from Gallium Sample

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。

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 BC501 Ascintillation detector.For the benchmark analy-sis of the neutron evaluated nuclear data of gallium,the leakage neutron spectra were simulated by MCNP 4 C 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.