Neutron multiplicity counting (NMC)has been widely used in many fields related to non-destructive nuclear ma-terial measurement,such as nuclear material protection control and accounting,arms control verification and so on.Developing simulation tools,and carrying out numerical experiments are important means in the research on the application of NMC,which also become one important area of neutron transport simulation.This paper presents a new method to calculate NMC by sequen-tial detection events simulation.By realizing the on-line NMC calculation,based on JMCT particle transport simulation code,the program to simulate neutron multiplicity counting,JMCT_NMC,was developed.This paper also presents some results of NMC calculation examples to test the code,and comparison of the time consumption of JMCT_NMC and traditional method.In JMCT_NMC code,by getting rid of the large data storage requirement,it is possible to simulate neutron multiplicity with large event number and high calculation efficiency.%提出基于时序处理探测事件的中子多重性计数统计方法.在JMCT粒子输运数值模拟程序的基础上研发了用于统计中子多重性计数的专用数值模拟程序JMCT_NMC,实现在线的中子多重性计数模拟功能.展示了利用中子多重性计数算例检验程序,比较了JMCT_NMC与传统算法计算时间消耗的结果.时序探测事件处理方法不需大量存储粒子信息,在解决中子多重性计数模拟受内存限制问题的同时,提升了计算效率.在JMCT_NMC程序中,时序探测事件模拟手段在探测器关联事件模拟、本底分析等领域还有着更广泛的应用前景.
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