宽能锗探测器的特性及其在Ge-76双β衰变研究中的应用
Characterization of a broad energy germanium detector and application to neutrinoless double beta decay search in Ge-76
摘要：
本文系统地研究了630克商用宽能锗探测器的性能。能量分辨率，线性度，稳定性与高压（HV）偏置，死层的厚度和均匀性进行了测量，发现是优秀的。特别注意已致力于研究的检测器响应作为偏置HV的函数。标称耗尽电压为3000 V，所研究的探测器在2000 V左右的偏压下表现出特殊的行为：在约100 V的窄范围内，电荷收集强烈减少。检测器似乎由两部分组成：HV接触周围的小体积，在较高电压下有效地收集电荷，以及大体积，电荷收集不良。这种行为的定性解释。基于A/E（电流脉冲的最大幅度超过探测器中释放的总能量）的逐事件脉冲形状分析已被应用于不同能量区域的事件，并发现在拒绝非局部事件方面非常有效。总之，BEGe探测器是GERDA第二阶段的优秀候选者，该实验致力于Ge-76的无中微子双β衰变。
英文摘要：
The performance of a 630g commercial broad energy germanium (BEGe) detector has been systematically investigated. Energy resolution, linearity, stability vs. high-voltage (HV) bias, thickness and uniformity of dead layers have been measured and found to be excellent. Special attention has been dedicated to the study of the detector response as a function of bias HV. The nominal depletion voltage being 3000V, the detector under investigation shows a peculiar behavior for biases around 2000V: in a narrow range of about 100V the charge collection is strongly reduced. The detector seems to be composed by two parts: a small volume around the HV contact where charges are efficiently collected as at higher voltage, and a large volume where charges are poorly collected. A qualitative explanation of this behavior is presented. An event-by-event pulse shape analysis based on A/E (maximum amplitude of the current pulse over the total energy released in the detector) has been applied to events in different energy regions and found very effective in rejecting non localized events. In conclusion, BEGe detectors are excellent candidates for the second phase of GERDA, an experiment devoted to neutrinoless double beta decay of Ge-76.
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