论文标题
优化第一个丘比特检测器模块
Optimization of the first CUPID detector module
论文作者
论文摘要
丘比特将是一个下一代实验,寻找中微子双$β$衰减,其发现将确立中微子的主要性质。基于Cuore实验获得的经验,目前在LNGS上获取数据,丘比特旨在通过闪烁Li $ _ {2} $ _ {2} $$^{100} $ Moo $ _4 $ crystals耦合到光检测器。实际上,正如丘比特-0和丘比特 - 摩托车示威者所证明的那样,同时的热和光检测使我们能够拒绝$α$颗粒的主要背景。在这项工作中,我们介绍了丘比特基线模块的首次测试的结果。特别是,我们提出了一种新的优化探测器结构和光传感器设计,以分别增强工程和光收集。我们表征了热探测器,以$^{100} $ MO(约3034 KEV)的$ q $ - 价值达到(5.9 $ \ pm $ 0.2)kev fwhm的能量分辨率。我们研究了基线丘比特设计的光收集,以替代性配置为具有重力辅助的光检测器的安装。在这两种情况下,我们都在过去的措施方面都取得了改善,并验证了检测器的粒子识别能力,这确保了$α$粒子排斥的抑制高于99.9%,从而完全满足了丘比特的要求。
CUPID will be a next generation experiment searching for the neutrinoless double $β$ decay, whose discovery would establish the Majorana nature of the neutrino. Based on the experience achieved with the CUORE experiment, presently taking data at LNGS, CUPID aims to reach a background free environment by means of scintillating Li$_{2}$$^{100}$MoO$_4$ crystals coupled to light detectors. Indeed, the simultaneous heat and light detection allows us to reject the dominant background of $α$ 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 $\pm$ 0.2) keV FWHM at the $Q$-value of $^{100}$Mo (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 $α$ particle rejection higher than 99.9%, fully satisfying the requirements for CUPID.