Benchmark experiment on slab^(238)U with D-T neutrons for validation of evaluated nuclear data  

作　　者：Yan-Yan Ding Yang-Bo Nie Yue Zhang Zhi-Jie Hu Qi Zhao Huan-Yu Zhang Kuo-Zhi Xu Shi-Yu Zhang Xin-Yi Pan Chang-Lin Lan Jie Ren Xi-Chao Ruan 

机构地区：[1]Key Laboratory of Nuclear Data,China Institute of Atomic Energy,Beijing 102413,China [2]School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China [3]Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 62100,China

出　　处：《Nuclear Science and Techniques》2024年第2期145-159,共15页核技术（英文）

基　　金：This work was supported by the general program(No.1177531);joint funding(No.U2067205)from the National Natural Science Foundation of China.

摘　　要：A benchmark experiment on^(238)U slab samples was conducted using a deuterium-tritium neutron source at the China Institute of Atomic Energy.The leakage neutron spectra within energy levels of 0.8-16 MeV at 60°and 120°were measured using the time-of-flight method.The samples were prepared as rectangular slabs with a 30 cm square base and thicknesses of 3,6,and 9 cm.The leakage neutron spectra were also calculated using the MCNP-4C program based on the latest evaluated files of^(238)U evaluated neutron data from CENDL-3.2,ENDF/B-Ⅷ.0,JENDL-5.0,and JEFF-3.3.Based on the comparison,the deficiencies and improvements in^(238)U evaluated nuclear data were analyzed.The results showed the following.(1)The calculated results for CENDL-3.2 significantly overestimated the measurements in the energy interval of elastic scattering at 60°and 120°.(2)The calculated results of CENDL-3.2 overestimated the measurements in the energy interval of inelastic scattering at 120°.(3)The calculated results for CENDL-3.2 significantly overestimated the measurements in the 3-8.5 MeV energy interval at 60°and 120°.(4)The calculated results with JENDL-5.0 were generally consistent with the measurement results.

关 键 词：Leakage neutron spectra URANIUM D-T neutron source Evaluated nuclear data 

分 类 号：TL816.3[核科学技术—核技术及应用]