论文标题
使用有机闪烁体对p的快速Rossi-Alpha测量
Fast Rossi-alpha Measurements of Plutonium using Organic Scintillators
论文作者
论文摘要
在这项工作中，Rossi-Alpha测量是通过基于$^3 $ HE的检测系统和基于有机闪烁体的检测系统同时进行的。大会是由铜反射的15公斤p（93 wt $ \％$ $^{239} $ pu），并由铅反射。 Rossi-Alpha测量的目的是估计迅速中子衰减常数Alpha。模拟估计$ k_ \ text {eff} $ = 0.624和$α$ = 52.3 $ \ pm $ 2.5 ns $ 2.5 ns。有机闪烁体系统估计$α$ = 47.4 $ \ pm $ 2.0 ns，具有9.37 $ \％$误差（尽管1.09标准偏差置信区间重叠）。 $^3 $ HE系统估计$α$ = 37 $μ$ s。 $^3 $ HE系统的已知减慢时间为35-40 $μ$ S，这意味着放缓的时间占主导地位并掩盖了迅速的中子衰减常数。随后，有机闪烁体系统应用于α少于35 $μ$ s的组件。
In this work, Rossi-alpha measurements were simultaneously performed with a $^3$He-based detection system and an organic scintillator-based detection system. The assembly is 15 kg of plutonium (93 wt$\%$ $^{239}$Pu) reflected by copper and moderated by lead. The goal of Rossi-alpha measurements is to estimate the prompt neutron decay constant, alpha. Simulations estimate $k_\text{eff}$ = 0.624 and $α$ = 52.3 $\pm$ 2.5 ns for the measured assembly. The organic scintillator system estimated $α$ = 47.4 $\pm$ 2.0 ns, having a 9.37$\%$ error (though the 1.09 standard deviation confidence intervals overlapped). The $^3$He system estimated $α$ = 37 $μ$s. The known slowing down time of the $^3$He system is 35-40 $μ$s, which means the slowing down time dominates and obscures the prompt neutron decay constant. Subsequently, the organic scintillator system should be used for assemblies with alpha much less than 35 $μ$s.
