基于广义最小二乘法原理的中子能谱解谱程序开发及验证

摘要

中子能谱是反应堆的一项重要参数 ,为验证理论计算 ,常使用阈探测器活化法对中子能谱进行实际测量.为解决由于活化片数量小于能群数量而引起的解谱问题并获得较高的解谱精度 ,基于广义最小二乘法原理开发了解谱程序NSAGLS.使用IAEA给出的例题进行了验证 ,结果表明该程序能够得到正确的解谱结果.该程序可用于反应堆中子能谱的解谱 ,并能够考虑输入谱、核反应截面及测量活度不确定度信息对解谱结果的影响.%For validating the calculation of neutron spectrum ,w hich is a key parameter for reactor ,the neutron spectrum is usually measured with threshold detector activation method .For resolving the spectrum unfolding issues caused by less number of activation detectors than neutron groups and getting a satisfactory accuracy ,the generalized least squares method was adopted and the neutron spectrum unfolding code NSAGLS was developed .This code was verified by benchmark example from IAEA .The results show that the correct neutron spectrum could be obtained using NSAGLS .The code could be used for neutron spectrum unfolding , and it could take into account the uncertainty information of input spectrum ,cross section and activity of activation foil .