金属铀钚核系统的瞬发中子衰减常数测量  

Measurement of Prompt Neutron Decay Constant on Uranium-Plutonium Metal Assembly

作　　者：刘晓波[1] 范晓强[1] 杨成德[1] 邓门才[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《核动力工程》2008年第6期14-16,共3页Nuclear Power Engineering

摘　　要：采用Rossi-a方法开展了金属铀钚核系统在缓发临界和次临界状态下的瞬发中子衰减常数测量,获得了系统在缓发临界时的瞬发中子衰减常数αc。分析了衰减常数a与反应性的关系,并将其与次临界计数率倒数外推和次临界反应性外推的结果作了分析比较。结果表明,在缓发临界下直接测量的数据为0.835±0.005/μs,数据误差是Rossi-a和外推方法的1/6左右。The prompt neutron decay constant a of the Uranium-Plutonium metal assembly was measured with Rossi-α technique at delay critical and sub-critical conditions, and then ac is obtained. The relationship between a with reactivity and a is analyzed with detector counts reciprocal. The compari：;on shows that the direct measured result under delay critical condition is 0.835±4）.005/μs, which error is 1/6 of that from Rossi-a and extrapolation methods.

关 键 词：瞬发中子衰减常数 Rossi-α方法 铀钚核系统 

分 类 号：TL326[核科学技术—核技术及应用] TL375.1