原子能科学技术2017，Vol.51Issue(2)：311-318,8.DOI:10.7538/yzk.2017.51.02.0311
基于MCNP的缓发裂变中子衰减时间谱模拟计算
MCNP Simulation on Delayed Fission Neutron Time Spectrum
摘要
Abstract
Based on the idea that the nuclear fission reaction occurring and delayed fission neutron emitting can be separated in time dimension,the delayed fission neutron time spectrum in the range of 0-100 s in uranium contained formation was calculated by MCNP.Firstly,the 235U and 238U nuclear fission reaction space distributions in sphere geometry were simulated.Then delayed fission neutron's emission position and direction,originated fission nuclide,delayed fission neutron group and emission time,and initial energy were sequentially sampled with the assistance of SOURCE subroutine in MCNP.The result shows that the time feature of the calculated delayed fission neutron time spectrum is in accordance with the group parameters of delayed fission neutron of uranium nuclides.The relationship between accumulative delayed fission neutron count and formation uranium concentration was linearly fitted.The adjusted-R square of fitting result is greater than 0.998 5,which verifies the credibility of uranium concentration linear model.关键词
缓发裂变中子/中子衰减时间谱/铀含量线性模型Key words
delayed fission neutron/neutron time spectrum/uranium concentration linear model分类
天文与地球科学引用本文复制引用
杨国召,张国光,赵潇,张帅,苏丹,丰树强..基于MCNP的缓发裂变中子衰减时间谱模拟计算[J].原子能科学技术,2017,51(2):311-318,8.基金项目
中国核工业集团公司核能开发科研项目资助(BA13003104) （BA13003104）
