Rossi-α测量方法的蒙特卡罗直接模拟

Simulation of Rossi-α Method With Analog Monte-Carlo Method

摘要: 本文基于Geant4 toolkit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%。

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%.

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