【作者】 丁雪峰； 曹国富； 邓子艳； 周详； 曹俊；

【Author】 DING Xue-feng;CAO Guo-fu;ZHOU Xiang;CAO Jun;Wuhan University;Institute of High Energy Physics, Chinese Academy of Sciences;

【机构】 武汉大学物理科学与技术学院； 中国科学院高能物理研究所；

【摘要】 本文利用大亚湾中微子实验的实验数据对液体闪烁体的吸收长度,瑞利散射长度和光产额进行约束,进而将这些参数应用于江门中微子实验的探测器模拟中,研究其对江门中微子实验探测器能量分辨的影响。江门中微子实验是我国正在筹建中的第二代中微子实验,其主要物理目标是测量中微子质量顺序。为实现该物理目标,要求探测器的能量分辨好于3%/√E。液闪的衰减长度和光产额是影响能量分辨率的重要因素。大亚湾实验的液闪衰减长度通过测量得到为15米,其中包括吸收长度和散射长度两种过程的贡献,而通过对液闪配方的优化和进一步的纯化处理,预期在江门中微子实验中光产额和衰减长度分别能提高50%和100%。通过固定液闪的衰减长度,并利用大亚湾实验数据对散射长度与光产额之间的关系进行约束,本文研究了不同瑞利散射长度对江门中微子实验能量分辨的影响。结果表明,瑞利散射长度从40米降到30米,探测器会多收集20%的光子。更多还原

【Abstract】 This article utilize the experiment data of the Dayabay neutrino experiment to constrain the absorption length, Rayleigh scattering length and the light yield of the liquid scintillator, which were then put into the simulation of JUNO detector to study their impacts on the JUNO detector’s energy resolution. JUNO is the under-construction 2rd generation neutrino experiment based in China, whose main physical target is determining the neutrino mass hierarchy. To achieve this target, the detector’s energy resolution has to be better than 3%/√E. The absorption length and the light yield of the liquid scintillator(LS) are important factors on energy resolution. The absorption length of Dayabay LS is measured to be 15 m, in which both absorption and Rayleigh scattering contributes, while JUNO’s light yield and absorption length are expected to be improved by 50% and 100% each with the optimization of the LS recipe and further purification. With fixed attenuation length, and constraining the relationship between Rayleigh scattering length and the light yield from the Dayabay experiment data, this article studies the impacts of variation of Rayleigh scattering length on JUNO’s energy resolution. Results showed that, when Rayleigh scattering length changed from 40 m to 30 m, the detector would collect 20% extra photons.更多还原