Measurement of Leakage Neutron Spectra for Tungsten with D-T Neutrons and Validation of Evaluated Nuclear Data
Measurement of Leakage Neutron Spectra for Tungsten with D-T Neutrons and Validation of Evaluated Nuclear Data
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DOI：
10.1016/j.fusengdes.2015.01.010
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发表时间：
2014-11
期刊：
影响因子：
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通讯作者：
S. Zhang;Zhenping Chen;Y. Nie;R. Wada;X. Ruan;R. Han;Xiang Liu;W. Lin;Jinjia Liu;
中科院分区：
文献类型：
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作者：
S. Zhang;Zhenping Chen;Y. Nie;R. Wada;X. Ruan;R. Han;Xiang Liu;W. Lin;Jinjia Liu;
为了验证与中国主动加速器驱动系统(CIADS)设计相关的评价核数据，中国科学院现代物理研究所(IMP，CAS)进行了积分中子学实验。本文通过将泄漏中子谱的实测值与计算值进行比较，检验了钨的评价核数据的准确性。用飞行时间法测量了60°和120°下D-T中子辐照钨板样品的泄漏中子谱。用蒙特卡罗中子输运程序MCNP-4C对ADS-2.0、ENDF/B-VII0、ENDF/B-VII.1、JENDL-4.0和CENDL-3.1库的核数据进行了理论计算。通过比较发现，ADS-2.0和ENDF/B-VII.1的计算结果在60°的全能区内与实验符合得很好，而在120°处的弹性散射峰与实验值相差很大，这是由于角大于20°的弹性角分布的振荡图样略有不同所致。然而，使用ENDF/B-VII.0、JENDL-4.0和CENDL-3.1库的数据计算的光谱与实测值有较大的偏差，特别是在8.5-13.5 MeV左右。对这些分歧进行了进一步的研究。
Integral neutronics experiments have been investigated at Institute of Modern Physics, Chinese Academy of Sciences (IMP, CAS) in order to validate evaluated nuclear data related to the design of Chinese Initiative Accelerator Driven Systems (CIADS). In the present paper, the accuracy of evaluated nuclear data for Tungsten has been examined by comparing measured leakage neutron spectra with calculated ones. Leakage neutron spectra from the irradiation of D-T neutrons on Tungsten slab sample were experimentally measured at 60° and 120° by using a time-of-flight method. Theoretical calculations are carried out by Monte Carlo neutron transport code MCNP-4C with evaluated nuclear data of the ADS-2.0, ENDF/B-VII.0, ENDF/B-VII.1, JENDL-4.0 and CENDL-3.1 libraries. From the comparisons, it is found that the calculations with ADS-2.0 and ENDF/B-VII.1 give good agreements with the experiments in the whole energy regions at 60°, while a large discrepancy is observed at 120° in the elastic scattering peak, caused by a slight difference in the oscillation pattern of the elastic angular distribution at angles larger than 20°. However, the calculated spectra using data from ENDF/B-VII.0, JENDL-4.0 and CENDL-3.1 libraries showed larger discrepancies with the measured ones, especially around 8.5–13.5 MeV. Further studies are presented for these disagreements.