标题： Ricochet实验在 Institut Laue-Langevin 的 mini-CryoCube 探测器的表征 显示英文标题

标题： Characterization of mini-CryoCube detectors from the Ricochet experiment commissioning at the Institut Laue-Langevin

摘要： 该反弹实验旨在测量来自由 Institut Laue-Langevin（法国格勒诺布尔）运营的研究核反应堆发射的反中微子与原子核的相干弹性中微子-核散射过程。 本文介绍了反弹实验装置以及在使用包含三个42克锗低温量热计的微型-CryoCube模块进行调试期间所实现的探测器性能。 在反应堆开启和关闭期间，报告了基线分辨率和背景水平，并且随着噪声缓解技术的改进而有所改善。 在设置改进后，对于电离通道实现了40电子伏特的基线分辨率，声子通道的分辨率范围为总声子能量的50至80电子伏特。 在2至7千电子伏特的能量范围内，在反应堆关闭期间，选择与μ子屏蔽信号符合的事件，测得核反冲速率为15(2)次/(千克天千电子伏特)。 该速率与从GEANT4模拟计算得到的宇宙射线中子速率一致。 在排除与μ子屏蔽探测器信号符合的事件后，在反应堆开启期间，在该能量范围内获得了联合90%置信度水平的核反冲背景上限小于9次/(千克天千电子伏特)，这与我们的GEANT4模型计算结果相容，对应总速率为5次/(千克天千电子伏特)。 然而，该分析的灵敏度被表面事件污染所限制，目前反弹合作组正在通过升级探测器来解决这一问题。 显示英文摘要

摘要： The Ricochet experiment aims to measure the coherent elastic neutrino-nucleus scattering process from antineutrinos emitted by a research nuclear reactor operated by the Institut Laue-Langevin (Grenoble, France). This article presents a description of the Ricochet experimental installation and the detector performance achieved during its commissioning with a mini-CryoCube module consisting of three 42-gram germanium cryogenic calorimeters. The baseline resolutions and background levels are reported both during reactor-on and reactor-off periods, and as noise mitigation techniques were improved. A baseline resolution of 40 eV electron equivalent was achieved for the ionization channel after setup improvements, and the phonon channel resolutions ranged from 50 to 80 eV of total phonon energy. In the energy region from 2 to 7 keV, a nuclear recoil rate of 15(2) events/(kg day keV) is measured during the reactor-off period selecting events in coincidence with muon veto signals. This rate is in agreement with the cosmogenic neutron rate calculated from GEANT4 simulations. After the rejection of events in coincidence with signals in the muon veto detectors, a combined 90% C.L. limit on the nuclear recoil background of < 9 events/(kg day keV) is obtained in that energy region during the reactor-on period, which is compatible with our GEANT4 model calculation corresponding to a total rate of 5 events/(kg day keV). The sensitivity of this analysis was however found to be limited by a surface event contamination which is currently being addressed by the Ricochet Collaboration with upgraded detectors.