原子能科学技术2012，Vol.46Issue(z1)：383-386,4.
柱形金属铀次临界系统瞬发中子衰减常数测量
Determination of Prompt Neutron Decay Constant of Cylindrical Metal Uranium Subcritical Assembly
摘要
Abstract
Prompt neutron decay constant a is an important parameter to determine the reactivity of subcritical assemblies. Randomly pulsed neutron measurements were performed to obtain a of a subcritical assembly composed of cylindrical uranium. Monte Carlo simulations, with its flexibility of recording neutrons of different origins and different energy, were used to analyze the influence of directly transmitted source neutrons on the prompt neutron decay. The simulation results show that the influence of directly transmitted source neutrons to the prompt neutron decay can be neglected after 100 ns for the cylindrical assembly. According to the simulation results, the initial channel of the experimental prompt neutron decay curves was selected as 100 ns and the data were fitted to a single exponential decay. The experimental results of a for the uranium metal subcritical assembly is 15. 5 μs-1.关键词
瞬发中子衰减常数/次临界/源中子/拟合起始道Key words
prompt neutron decay constant/ subcritical/ source neutron/ fitting initial channel分类
数理科学引用本文复制引用
宋凌莉,金宇,李建胜,周浩军..柱形金属铀次临界系统瞬发中子衰减常数测量[J].原子能科学技术,2012,46(z1):383-386,4.基金项目
国家自然科学基金资助项目(11175164) （11175164）
中国工程物理研究院科技发展基金资助项目(2011B0103015) （2011B0103015）
