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通过用阈探测器测量热中子引起的~(235)U裂变中子能谱,研究了SAND-Ⅱ和RDMM方法的解谱能力。并用蒙特卡罗误差分析程序分析了两种解谱方法的输入数据误差。对SAND-Ⅱ方法中解的唯一性误差和RDMM方法中权重函数的影响进行了讨论。两种方法对未知谱中结构的灵敏程度也作了简单的检验。结果表明,SAND-Ⅱ和RDMM是解快中子光滑变化能谱的较好方法。当未知谱中有简单结构时,用SAND-Ⅱ方法更为合适。
By using the threshold detector to measure ~ (235) U fission neutron energy spectrum induced by thermal neutrons, the resolving power of SAND-Ⅱ and RDMM methods is studied. Monte Carlo error analysis program was used to analyze the input data errors of the two methods. The uniqueness of the solution in the SAND-Ⅱ method and the influence of the weighting function in the RDMM method are discussed. Both methods also make simple tests on the sensitivity of the unknown spectra. The results show that SAND-Ⅱ and RDMM are good methods for solving the fast changing neutron energy spectrum. When there is a simple structure in the unknown spectrum, the SAND-II method is more suitable.