金属铀钚核系统的瞬发中子衰减常数测量

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

Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, China

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_α_c。分析了衰减常数_α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。
- 瞬发中子衰减常数 /
- Rossi-α方法 /
- 铀钚核系统
Abstract: The prompt neutron decay constant α of the Uranium-Plutonium metal assembly was meas-ured with Rossi-α technique at delay critical and sub-critical conditions,and then α_c is obtained.The relation-ship between α with reactivity and α is analyzed with detector counts reciprocal.The comparison shows that the direct measured result under delay critical condition is 0.835±0.005/μs,which error is 1/6 of that from Rossi-a and extrapolation methods.
- Prompt neutron decay constant /
- Rossi-a /
- Uranium-Plutonium metal assembly