用单次康普顿散射事例进行脉冲波形分析的检验
Test of pulse shape analysis using single Compton scattering events
摘要：
康普顿散射是锗中能量约为2 MeV的光子的主要相互作用过程之一。如果一个光子在锗探测器内只散射一次，那么所产生的事件只包含一个电子，该电子通常在毫米范围内沉积其能量。这些事件类似于Ge-76的无中微子双β衰变事件，只有两个电子处于终态。其他光子相互作用，如对产生或多重散射，可以导致由分离的能量沉积组成的事件。识别多个能量沉积的一种方法是使用包含在检测器或检测器的一段的电响应中的定时信息。开发的程序，以单独的单和多站点的事件进行测试与专门选择的事件样本提供的18倍分段的原型锗探测器的锗探测器阵列，GERDA的第二阶段。通过用以限定角度定位的第二检测器同时检测散射光子来标记单个康普顿散射（即，单位点）事件。训练神经网络以将这些事件与来自多站点主导样本的事件分离。对于单点和多点事件，识别效率达到~80%。
英文摘要：
Compton scattering is one of the dominant interaction processes in germanium for photons with an energy of around two MeV. If a photon scatters only once inside a germanium detector, the resulting event contains only one electron which normally deposits its energy within a mm range. Such events are similar to Ge-76 neutrinoless double beta-decay events with just two electrons in the final state. Other photon interactions like pair production or multiple scattering can result in events composed of separated energy deposits. One method to identify the multiple energy deposits is the use of timing information contained in the electrical response of a detector or a segment of a detector. The procedures developed to separate single- and multiple-site events are tested with specially selected event samples provided by an 18-fold segmented prototype germanium detector for Phase II of the GERmanium Detector Array, GERDA. The single Compton scattering, i.e. single-site, events are tagged by coincidently detecting the scattered photon with a second detector positioned at a defined angle. A neural network is trained to separate such events from events which come from multi-site dominated samples. Identification efficiencies of ~80% are achieved for both single- and multi-site events.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
