基于邦纳多球谱仪探测的中子能谱解谱研究  

Neutron spectrum unfolding based on the detection of Bonner multi-sphere spectrometer

作　　者：张硕[1] 范杰清[1] 张芳[2] 赵强[2] 郝建红[1] 董志伟[2] Zhang Shuo;Fan Jieqing;Zhang Fang;Zhao Qiang;Hao Jianhong;Dong Zhiwei(North China Electric Power University,Beijing 102206,China;Institute of Applied Physics and Computational Mathematics,Beijing 100094,China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]北京应用物理与计算数学研究所,北京100094

出　　处：《强激光与粒子束》2024年第12期115-120,共6页High Power Laser and Particle Beams

基　　金：国家自然科学青年基金项目(12205024)。

摘　　要：在中子辐射领域,中子解谱问题备受关注。邦纳多球谱仪常用于中子能谱探测,最大熵法可针对多球谱仪探测数据进行中子解谱。基于此原理,建立包含邦纳多球谱仪的仿真模型,以蒙特卡罗方法的模拟结果作为先验谱,使用基于最大熵原理的最大熵反卷积(MAXED)方法进行中子解谱,结果证明了方法的有效性和准确性。通过增加蒙特卡罗方法的随机粒子数,获得了精确度不同的多组先验谱,对于不同的先验谱,最终解谱结果均可获得统计学显著性,解谱结果有效。经过对比,先验谱越精准,最终解谱结果准确度越高,说明通过合适的降方差方法获得准确的蒙特卡罗计算结果至关重要,可为后续研究和实验提供参考。同步使用了基于迭代算法的GRAVEL方法进行中子解谱,两种解谱方法计算结果对比进一步证明了MAXED方法解谱的优越性能。In the field of neutron radiation,the problem of neutron spectrum unfolding has attracted much attention.The Bonner sphere spectrometer is often used for neutron spectrum detection,and the maximum entropy method can be used to analyze the neutron spectrum of the Bonner sphere spectrometer.Based on this principle,this paper establishes a simulation model including the Bonner sphere spectrometer with reference to the neutron shielding experiment in 2014.The simulation results of Monte Carlo method are used as the prior spectrum,and the maximum entropy deconvolution code(MAXED)based on the principle of maximum entropy is used for neutron spectrum unfolding.The effectiveness and accuracy of the method are verified by comparing with the literature data.By increasing the number of random particles in Monte Carlo method,multiple groups of prior spectrum with different accuracy are obtained.For different prior spectrum,the final spectral solution results can be statistically significant and the spectral solution results are effective.After comparison,the more accurate the prior spectrum is,the higher the accuracy of the final spectral solution results,indicating that it is important to obtain accurate Monte Carlo calculation results through appropriate variance reduction method,which can provide reference for subsequent research and experiments.In this paper,the GRAVEL method based on iterative algorithm is used to solve the neutron spectrum simultaneously,and the comparison of the calculation results of the two methods further proves the superior performance of the solution spectrum of the MAXED method.

关 键 词：中子探测器 中子解谱 最大熵法 先验谱 

分 类 号：TL81[核科学技术—核技术及应用]