Correction for hole trapping in AGATA detectors using pulse shape analysis
Correction for hole trapping in AGATA detectors using pulse shape analysis
复制标题
使用脉冲形状分析校正 AGATA 探测器中的空穴捕获
DOI：
10.1140/epja/i2013-13061-4
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
F. C. Collaboration
中科院分区：
文献类型：
--
作者：
B. Bruyneel;B. Birkenbach;J. Eberth;H. Hess;G. Pascovici;P. Reiter;A. Wiens;D. Bazzacco;E. Farnea;C. Michelagnoli;F. Recchia;F. C. Collaboration
来自 AGATA 能谱仪的高度分段高纯锗 (HPGe) 探测器的数据表明，分段比中央核心接触点对中子损伤更敏感。为了理解这种现象，对 HPGe 探测器内电荷载流子的收集效率进行了计算。捕获灵敏度是一种基于电子和空穴收集效率的表达式，用于量化载流子捕获的效果。评估检测器体积中每个位置相对于不同电极和收集的电荷载流子类型的灵敏度。使用通过位置敏感 AGATA 探测器的脉冲形状分析获得的位置信息，可以利用探测器特定的灵敏度值来校正能量不足。我们报告了对核心和分段电极信号严重中子损坏的 AGATA 探测器的能量峰值的成功校正。由于捕获效应引起的统计波动，原始能量分辨率可以最佳地恢复到一定的可量化的退化极限。
Data from the highly segmented High-Purity Germanium (HPGe) detectors of the AGATA spectrometer show that segments are more sensitive to neutron damage than the central core contact. Calculations on the collection efficiency of charge carriers inside the HPGe detector were performed in order to understand this phenomenon. The trapping sensitivity, an expression based on the collection efficiencies for electrons and holes, is put forward to quantify the effect of charge carrier trapping. The sensitivity is evaluated for each position in the detector volume with respect to the different electrodes and the collected charge carrier type. Using the position information obtained by pulse shape analysis from the position-sensitive AGATA detectors, it is possible to correct for the energy deficit employing detector specific sensitivity values. We report on the successful correction of the energy peaks from heavily neutron-damaged AGATA detectors for core and segment electrode signals. The original energy resolution can optimally be recovered up to a certain quantifiable limit of degradation due to statistical fluctuations caused by trapping effects.