Optimization, simulation and analysis of the scintillation signals in the Double Chooz experiment
Optimization, simulation and analysis of the scintillation signals in the Double Chooz experiment
复制标题
Double Chooz 实验中闪烁信号的优化、仿真与分析
DOI：
10.11588/heidok.00012850
复制
发表时间：
2011
影响因子：
2.8
通讯作者：
C. Aberle
中科院分区：
文献类型：
--
作者：
C. Aberle
反应堆中微子实验Double Chooz寻找最后一个未知的中微子混合角Theta13，这与粒子物理学中的基本开放问题有关。采用双探测器的概念来分析电子反中微子在一公里基线上的消失。用负载钆的有机液体闪烁体作为中微子靶。不含钆的伽玛捕集器围绕在中微子目标周围，提高了探测器的效率和误差。Target和Gamma Catcher的光产率已经过优化，并与实验室测量、能量传递模型和蒙特卡罗模拟相匹配。对探测器数据的分析表明，光产率匹配在1%的水平上是成功的。显示了远端探测器数据采集前3.5个月的光学稳定性。通过实验室测量和对电子和α粒子的电离猝灭效应的蒙特卡罗调谐，改进了能量重建。此外，通过对位置相关探测器光收集效率的模拟，提出了一种非均匀性校正方法。研究了探测器对α和电子的响应时间，并主动调整了闪烁体光子发射时间，以提高脉冲形状识别能力。
The reactor neutrino experiment Double Chooz searches for the last unknown neutrino mixing angle Theta13 which is connected to fundamental open questions in particle physics. A two-detector concept is employed to analyze disappearance of electron antineutrinos at a baseline of one kilometer. A gadolinium-loaded organic liquid scintillator is used as a neutrino target. The gadolinium-free Gamma Catcher scintillator surrounds the neutrino target to improve the detector efficiency and its error. The light yields of Target and Gamma Catcher have been optimized and matched with laboratory measurements, an energy transfer model and Monte Carlo simulations. An analysis of detector data demonstrates that the light yield matching was successful at the one percent level. Optical stability for the first 3.5 months of far detector data taking is shown. The energy reconstruction was improved by laboratory measurements and Monte Carlo tuning of the ionization quenching effect for electrons and alpha particles. In addition, simulations of the position dependent detector light collection efficiency led to an inhomogeneity correction method. The detector response timing was studied for alphas and electrons and the scintillator photon emission times were actively tuned to enhance pulse shape discrimination capabilities.