NUCLEUS: Exploring Coherent Neutrino-Nucleus Scattering with Cryogenic Detectors
NUCLEUS: Exploring Coherent Neutrino-Nucleus Scattering with Cryogenic Detectors
复制标题
核：用低温探测器探索相干中微子核散射
DOI：
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发表时间：
2019
影响因子：
2
通讯作者：
A. Zolotarova
中科院分区：
文献类型：
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作者：
J. Rothe;G. Angloher;F. Ardellier;F. Ardellier;A. Bento;A. Bento;L. Canonica;A. Erhart;N. Ferreiro;M. Friedl;V. Ghete;D. Hauff;H. Kluck;T. Lasserre;T. Lasserre;D. Lhuillier;A. Kinast;M. Mancuso;J. Rubiales;E. Mondragon;G. Munch;C. Nones;L. Oberauer;T. Ortmann;L. Pattavina;F. Petricca;W. Potzel;F. Pröbst;F. Reindl;J. Schieck;S. Schönert;C. Schwertner;L. Scola;L. Stodolsky;R. Strauss;M. Vivier;V. Wagner;A. Zolotarova
核实验的目的是用克级、超低阈值低温探测器在核动力反应堆上探测相干弹性中微子-核散射。这项技术导致了中微子探测器的小型化，并允许探测超出粒子物理标准模型的物理。2017年在地面运行的0.5微克原子核原型探测器，达到了低于20千电子伏特的核反冲能量阈值。这种灵敏度是通过钨过渡边传感器实现的，该传感器在15MK的温度下工作，主要对非热声子敏感。有了这项技术，这些小的反冲能量第一次变得可以获得，这项技术允许收集具有中等探测器质量的大统计中微子事件样本。总质量为10微克的第一阶段低温探测器阵列能够在几周内对相干散射进行5西格玛观测。我们在Chooz核电站确定了一个合适的实验点，并在那里进行了Muon和中子本底测量。在这样的位置运行核低温探测器阵列需要高效的本底抑制。核能计划使用一项创新技术，包括针对地表背景和穿透(伽马、中子)辐射的独立低温反符合探测器。我们给出了这些否决权探测器原型的第一个结果，以及它们与原子核目标探测器的运行情况。
The NUCLEUS experiment aims for the detection of coherent elastic neutrino-nucleus scattering at a nuclear power reactor with gram-scale, ultra-low-threshold cryogenic detectors. This technology leads to a miniaturization of neutrino detectors and allows to probe physics beyond the Standard Model of particle physics. A 0.5 g NUCLEUS prototype detector, operated above ground in 2017, reached an energy threshold for nuclear recoils of below 20 eV. This sensitivity is achieved with tungsten transition edge sensors which are operating at temperatures of 15 mK and are mainly sensitive to non-thermal phonons. These small recoil energies become accessible for the first time with this technology, which allows collecting large-statistics neutrino event samples with a moderate detector mass. A first-phase cryogenic detector array with a total mass of 10 g enables a 5-sigma observation of coherent scattering within several weeks. We identified a suitable experimental site at the Chooz Nuclear Power Plant and performed muon and neutron background measurements there. The operation of a NUCLEUS cryogenic detector array at such a site requires highly efficient background suppression. NUCLEUS plans to use an innovative technique consisting of separate cryogenic anticoincidence detectors against surface backgrounds and penetrating (gamma, neutron) radiation. We present first results from prototypes of these veto detectors and their operation in coincidence with a NUCLEUS target detector.