Measurement of Prompt Neutron Decay Constant for Deep Subcritical Assembly Using 252Cf as Randomly Pulsed Neutron Source
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摘要: 运用252Cf 随机脉冲源法时幅变换(TAC)方式测量系统,实验获得高浓缩铀椭球壳核系统的瞬发中子衰减常数α。采用单指数和双指数最小二乘法拟合,α值均为100μs-1。用蒙特卡罗方法模拟实验过程,α计算值为110μs-1。结果表明,该系统对深次临界α的测量是有效的。Abstract: Experiments were performed for determing prompt neutron decay constant α of highly enriched uranium spherical shell by randomly pulsed neutron nethod with a 252Cf source. α values from both least squares analysis of single exponential and two exponential fittings are in agreement and it is 100μs-1. α value calculated of 110μs-1 is also obtained by Monte-Carlo method. It is proved that the time-to-amplitude converter measuring system is effective for α determination of deep subcritical assemblies.
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Keywords:
- 252Cf ,
- subcriticality ,
- prompt neutron decay constant
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