Multisite event discrimination for the MAJORANA DEMONSTRATOR
Multisite event discrimination for the MAJORANA DEMONSTRATOR
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DOI：
10.1103/physrevc.99.065501
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发表时间：
2019-06-07
影响因子：
3.1
通讯作者：
Zhu, B. X.
中科院分区：
文献类型：
--
作者：
Alvis, S., I;Arnquist, I. J.;Zhu, B. X.
马约拉纳演示器正在桑福德地下研究设施使用点接触锗探测器阵列搜索Ge-76中的无中微子双β衰变（0 nu β β）。最近公布了在建造、试运行和全面运行开始期间采集的0 nu beta beta感兴趣区域的背景结果。本文介绍了一种用于实现这一结果的脉冲波形分析切割，名为AvsE。开发该切割是为了去除波形为多点能源矿床典型波形的事件，同时保留（90 +/- 3.5）%的单点事件。该脉冲形状鉴别基于最大电流和能量之间的关系，并且使用Th-228校准源数据进行调谐。效率的不确定性占检测器，能量和时间的变化，以及校准和0 nu β β事件之间的位置分布差异，建立使用模拟。
The MAJORANA DEMONSTRATOR is searching for neutrinoless double-beta decay (0 nu beta beta) in Ge-76 using arrays of point-contact germanium detectors operating at the Sanford Underground Research Facility. Background results in the 0 nu beta beta region of interest from data taken during construction, commissioning, and the start of full operations have been recently published. A pulse shape analysis cut applied to achieve this result, named AvsE, is described in this paper. This cut is developed to remove events whose waveforms are typical of multisite energy deposits while retaining (90 +/- 3.5)% of single-site events. This pulse shape discrimination is based on the relationship between the maximum current and energy, and tuned using Th-228 calibration source data. The efficiency uncertainty accounts for variation across detectors, energy, and time, as well as for the position distribution difference between calibration and 0 nu beta beta events, established using simulations.