【作者】 卢玉朝； 谢奇林； 宋凌莉； 刘汉刚；

【Author】 LU Yu-zhao1,2,XIE Qi-lin1,2,,SONG Ling-li1,2,LIU Han-gang1,2(1.Key Laboratory of Neutron Physics,China Academy of Engineering Physics,Mianyang 621900,China; 2.Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China)

【机构】 中国工程物理研究院中子物理重点实验室； 中国工程物理研究院核物理与化学研究所；

【摘要】 本文基于Geant4toolkit开发了用于Rossi-α测量方法模拟的蒙特卡罗直接模拟程序,模拟计算了橡树岭实验室基准装置6个不同几何尺寸浓缩铀圆柱系统的瞬发中子衰减常数α,同时采用脉冲中子源方法模拟计算了α,二者结果一致。蒙特卡罗直接模拟计算结果与实验结果存在偏差,空隙是产生偏差的最主要原因,随着次临界度的加深,空隙的影响减小,计算和实际测量的α的相对偏差从19%变为0.19%。更多还原

【Abstract】 The analog Monte-Carlo code for simulating Rossi-α method based on Geant4 was developed.The prompt neutron decay constan α of six metal uranium configurations in Oak Ridge National Laboratory were calculated.α was also calculated by Burst-Neutron method and the result was consistent with the result of Rossi-α method.There is the difference between results of analog Monte-Carlo simulation and experiment,and the reasons for the difference is the gaps between uranium layers.The influence of gaps decrease as the sub-criticality deepens.The relative difference between results of analog Monte-Carlo simulation and experiment changes from 19% to 0.19%.更多还原