Integral experiment on slab^(nat)Pb using D-T and D-D neutron sources to validate evaluated nuclear data  

作　　者：Kuo-Zhi Xu Yang-Bo Nie Chang-Lin Lan Yan-Yan Ding Shi-Yu Zhang Qi Zhao Xin-Yi Pan 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

出　　处：《Nuclear Science and Techniques》2025年第3期119-133,共15页核技术(英文)

基　　金：supported by the National Natural Science Foundation of China(Nos.11775311 and U2067205);the Stable Support Basic Research Program Grant(BJ010261223282);the Research and Development Project of China National Nuclear Corporation。

摘　　要：Lead(Pb)plays a significant role in the nuclear industry and is extensively used in radiation shielding,radiation protection,neutron moderation,radiation measurements,and various other critical functions.Consequently,the measurement and evaluation of Pb nuclear data are highly regarded in nuclear scientific research,emphasizing its crucial role in the field.Using the time-of-flight(ToF)method,the neutron leakage spectra from three^(nat)Pb samples were measured at 60°and 120°based on the neutronics integral experimental facility at the China Institute of Atomic Energy(CIAE).The^(nat)Pb sample sizes were30 cm×30 cm×5 cm,30 cm×30 cm×10 cm,and 30 cm×30 cm×15 cm.Neutron sources were generated by the Cockcroft-Walton accelerator,producing approximately 14.5 MeV and 3.5 MeV neutrons through the T(d,n)^(4)He and D(d,n)^(3)He reactions,respectively.Leakage neutron spectra were also calculated by employing the Monte Carlo code of MCNP-4C,and the nuclear data of Pb isotopes from four libraries:CENDL-3.2,JEFF-3.3,JENDL-5,and ENDF/B-Ⅷ.0 were used individually.By comparing the simulation and experimental results,improvements and deficiencies in the evaluated nuclear data of the Pb isotopes were analyzed.Most of the calculated results were consistent with the experimental results;however,a few areas did not fit well.In the(n,el)energy range,the simulated results from CENDL-3.2 were significantly overestimated;in the(n,inl)D and the(n,inl)C energy regions,the results from CENDL-3.2 and ENDF/B-Ⅷ.0 were significantly overestimated at 120°,and the results from JENDL-5 and JEFF-3.3 are underestimated at 60°in the(n,inl)D energy region.The calculated spectra were analyzed by comparing them with the experimental spectra in terms of the neutron spectrum shape and C/E values.The results indicate that the theoretical simulations,using different data libraries,overestimated or underestimated the measured values in certain energy ranges.Secondary neutron energies and angular distributions in the data files have been presented

关 键 词：Integral experiment Neutron leakage spectra ^(nat)Pb D-T and D-D neutron sources Evaluated nuclear data 

分 类 号：O57[理学—粒子物理与原子核物理]