Optimization of the first CUPID detector module
Optimization of the first CUPID detector module
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DOI：
10.1140/epjc/s10052-022-10720-3
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发表时间：
2022-09-12
影响因子：
4.4
通讯作者：
Zucchelli, S.
中科院分区：
文献类型：
--
作者：
Alfonso, K.;Armatol, A.;Zucchelli, S.
CUPID将是寻找无中微子双β衰变的下一代实验，其发现将确立中微子的马约拉纳性质。根据CUORE实验取得的经验，目前在LNOS获取数据，CUPID的目标是通过将（Li 2 MoO 4）-Mo-100晶体耦合到光探测器来达到无背景环境。事实上，热和光的同时检测使我们能够拒绝α粒子的主导背景，正如CUPID-0和CUPID-Mo演示器所证明的那样。在这项工作中，我们提出的CUPID基线模块的第一次测试的结果。特别是，我们提出了一种新的优化的检测器结构和光传感器设计，以提高工程和光收集，分别。我们表征了热探测器，在Mo-100的Q值（约3034 keV）处实现了（5.9 +/- 0.2）keV FWHM的能量分辨率。我们研究了基线CUPID设计的光收集，以及具有重力辅助光探测器安装的替代配置。在这两种情况下，我们都获得了相对于过去措施的光收集的改进，并且我们验证了检测器的颗粒识别能力，这确保了高于99.9%的颗粒拒绝率，完全满足CUPID的要求。
CUPID will be a next generation experiment searching for the neutrinoless double beta decay, whose discovery would establish the Majorana nature of the neutrino. Based on the experience achieved with the CUORE experiment, presently taking data at LNOS, CUPID aims to reach a background free environment by means of scintillating (Li2MoO4)-Mo-100 crystals coupled to light detectors. Indeed, the simultaneous heat and light detection allows us to reject the dominant background of alpha particles, as proven by the CUPID-0 and CUPID-Mo demonstrators. In this work we present the results of the first test of the CUPID baseline module. In particular, we propose a new optimized detector structure and light sensors design to enhance the engineering and the light collection, respectively. We characterized the heat detectors, achieving an energy resolution of (5.9 +/- 0.2) keV FWHM at the Q-value of Mo-100 (about 3034 keV). We studied the light collection of the baseline CUPID design with respect to an alternative configuration which features gravity-assisted light detectors' mounting. In both cases we obtained an improvement in the light collection with respect to past measures and we validated the particle identification capability of the detector, which ensures an a particle rejection higher than 99.9%, fully satisfying the requirements for CUPID.