论文标题
测量水基液体闪光灯的质子光产率
Measurement of proton light yield of water-based liquid scintillator
论文作者
论文摘要
在大规模中微子实验中使用的情况下，液体闪烁体的质子光产率是重要的特性，对中微子 - 普罗希望的散射测量结果有直接影响，并歧视快速中性子与逆β-元素重合信号的差异。这项工作提出了从5％线性烷基苯（LAB）配制的水基液体闪烁体（WBL）的首次测量，以低于20 MeV的能量，以及测量纯实验室 + 2 G/L 2,5-二甲基氧氧甲唑（PPOPOPOPOPOPO）的质子光屈服。使用双飞行时间方法和来自劳伦斯·伯克利国家实验室88英寸回旋子的脉冲中子束进行测量。相对于477 keV电子的质子屈服是测量的。 WBL的相对质子光产率比Labppo低约3.8％，其本身表现出相对质子光的产量$ 15-20 \％$比以前的类似缺氧样品的测量值高。观察到的淬灭与两种材料的Birks模型都不兼容，但通过添加Chou的双分子淬灭项来很好地描述。
The proton light yield of liquid scintillators is an important property in the context of their use in large-scale neutrino experiments, with direct implications for neutrino-proton scattering measurements and the discrimination of fast neutrons from inverse beta-decay coincidence signals. This work presents the first measurement of the proton light yield of a water-based liquid scintillator (WbLS) formulated from 5% linear alkyl benzene (LAB), at energies below 20 MeV, as well as a measurement of the proton light yield of a pure LAB + 2 g/L 2,5-diphenyloxazole (PPO) mixture (LABPPO). The measurements were performed using a double time-of-flight method and a pulsed neutron beam from the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. The proton light yields were measured relative to that of a 477 keV electron. The relative proton light yield of WbLS was approximately 3.8% lower than that of LABPPO, itself exhibiting a relative proton light yield $15-20\%$ higher than previous measurements of an analogous anoxic sample. The observed quenching is not compatible with the Birks model for either material, but is well described with the addition of Chou's bimolecular quenching term.
