Results of the engineering run of the Coherent Neutrino Nucleus Interaction Experiment (CONNIE)
Results of the engineering run of the Coherent Neutrino Nucleus Interaction Experiment (CONNIE)
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DOI：
10.1088/1748-0221/11/07/p07024
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发表时间：
2016-04
影响因子：
1.3
通讯作者：
A. Aguilar-Arevalo;X. Bertou;C. Bonifazi;M. Butner;G. Cancelo;A. Vázquez;B. C. Vergara;C. Chavez;H. Motta;J. D'Olivo;J. Anjos;J. Estrada;G. Moroni;R. Ford;A. Foguel;K. P. H. Torres;F. Izraelevitch;A. Kavner;B. Kilminster;K. Kuk;H. Lima;M. Makler;J. Molina;G. Moreno-Granados;J. Moro;E. Paolini;M. S. Haro;J. Tiffenberg;F. Trillaud;S. Wagner
中科院分区：
文献类型：
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作者：
A. Aguilar-Arevalo;X. Bertou;C. Bonifazi;M. Butner;G. Cancelo;A. Vázquez;B. C. Vergara;C. Chavez;H. Motta;J. D'Olivo;J. Anjos;J. Estrada;G. Moroni;R. Ford;A. Foguel;K. P. H. Torres;F. Izraelevitch;A. Kavner;B. Kilminster;K. Kuk;H. Lima;M. Makler;J. Molina;G. Moreno-Granados;J. Moro;E. Paolini;M. S. Haro;J. Tiffenberg;F. Trillaud;S. Wagner
康尼探测器的原型工作在距离3.8GWth核反应堆核心30米的地方，目标是建立电荷耦合器件(CCD)，作为探测相干弹性中微子-核散射的一种新技术。我们报告了使用4g活性质量的硅进行工程运行的结果。描述了该面阵，并讨论了在第一年中观察到的性能。探测器周围部署了紧凑的被动屏蔽，使背景速率降低了数量级。在运行过程中观察到的剩余本底是稳定的，并且主要是探测器包装材料中的内部污染。利用来自荧光的X射线线对探测器进行了现场标定，表明读出系统具有良好的稳定性。比较了反应堆开启和关闭时的事故率，没有观察到核电站发生核裂变时的过剩。中微子事件速率的上限被设定为比标准模型的预期高出两个数量级。结果表明，低温CCD型探测器可以在反应堆现场远程工作，噪声稳定在2 e−rms以下，背景速率稳定。工程测试的成功为升级后的100g探测器在2016年部署提供了明确的途径。
The CONNIE detector prototype is operating at a distance of 30 m from the core of a 3.8 GWth nuclear reactor with the goal of establishing Charge-Coupled Devices (CCD) as a new technology for the detection of coherent elastic neutrino-nucleus scattering. We report on the results of the engineering run with an active mass of 4 g of silicon. The CCD array is described, and the performance observed during the first year is discussed. A compact passive shield was deployed around the detector, producing an order of magnitude reduction in the background rate. The remaining background observed during the run was stable, and dominated by internal contamination in the detector packaging materials. The in-situ calibration of the detector using X-ray lines from fluorescence demonstrates good stability of the readout system. The event rates with the reactor ON and OFF are compared, and no excess is observed coming from nuclear fission at the power plant. The upper limit for the neutrino event rate is set two orders of magnitude above the expectations for the standard model. The results demonstrate the cryogenic CCD-based detector can be remotely operated at the reactor site with stable noise below 2 e− RMS and stable background rates. The success of the engineering test provides a clear path for the upgraded 100 g detector to be deployed during 2016.