Monte Carlo studies and optimization for the calibration system of the GERDA experiment
Monte Carlo studies and optimization for the calibration system of the GERDA experiment
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DOI：
10.1016/j.nima.2013.08.003
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发表时间：
2013-11-21
影响因子：
1.4
通讯作者：
Tarka, M.
中科院分区：
文献类型：
--
作者：
Baudis, L.;Ferella, A. D.;Tarka, M.
GERmanium 探测器阵列 (GERDA) 使用浸没在液氩中的裸露高纯度锗探测器来搜索 Ge-76 中的无中微子双衰变。为了校准这些探测器，必须将 7 个发射源从低温恒温器顶部的停放位置降低到距锗晶体超过 5 m 的位置。借助蒙特卡罗模拟，确定了标定系统的相关参数。研究发现，为了在不到 4 小时的校准时间内在所有探测器中达到足够的统计数据，需要在两个不同的垂直位置使用三个 Th-228 源，每个源的活动度为 20 kBq。当在停放位置用 6 厘米的钽从下方屏蔽时，这些源将对实验背景产生总计 (1.07 +/- 0.04(stat) (+0.13)(-0.19)(sys)) 为 10(-4) ctsAkeV kg yr))。 (C) 2013 Elsevier B.V. 保留所有权利。
The GERmanium Detector Array, GERDA, searches for neutrinoless double is decay in Ge-76 using bare highpurity germanium detectors submerged in liquid argon. For the calibration of these detectors 7 emitting sources have to be lowered from their parking position on the top of the cryostat over more than 5 m clown to the germanium crystals. With the help of Monte Carlo simulations, the relevant parameters of the calibration system were determined. It was found that three Th-228 sources with an activity of 20 kBq each at two different vertical positions will be necessary to reach sufficient statistics in all detectors in less than 4 h of calibration time. These sources will contribute to the background of the experiment with a total of (1.07 +/- 0.04(stat) (+0.13)(-0.19)(sys)) is 10(-4) ctsAkeV kg yr)) when shielded from below with 6 cm of tantalum in the parking position. (C) 2013 Elsevier B.V. All rights reserved.