寻找eV无菌中微子--STEREO实验[ TAUP 2017]
Search for eV Sterile Neutrinos -- The STEREO Experiment [TAUP 2017]
摘要：
近年来，中微子物理学的重要里程碑在核反应堆上完成：最小的中微子混合角$θ_{13}$被高精度地确定，发射的反中微子光谱以前所未有的分辨率被测量。然而，两个异常，第一个有关的绝对通量和第二个光谱形状，尚未解决。通量异常被称为反应堆反中微子异常，可能是由于参与中微子振荡现象的轻无菌中微子本征态的存在引起的。引入无菌状态意味着存在第四质量本征态，而全球拟合有利于$\sin^{2}(2θ)=0.09$和$Δm^{2}=1.8\textrm{eV}^{2}$周围的振荡参数。立体声实验的建立最终解决了这个难题。这是第一个运行的实验之一，用于寻找eV无菌中微子，并自2016年底以来在法国格勒诺布尔ILL获得数据。它以10米的短基线测量一个小型研究反应堆发射的反中微子通量和光谱。将探测器分割成六个目标单元，可以在多个基线上独立测量中微子光谱。可以明确地检测到活性-无菌风味振荡，因为它使每个细胞测量的光谱形状不同地失真。本文概述了STEREO实验，详细介绍了探测器设计、探测原理和数据分析的现状。
英文摘要：
In the recent years, major milestones in neutrino physics were accomplished at nuclear reactors: the smallest neutrino mixing angle $θ_{13}$ was determined with high precision and the emitted antineutrino spectrum was measured at unprecedented resolution. However, two anomalies, the first one related to the absolute flux and the second one to the spectral shape, have yet to be solved. The flux anomaly is known as the Reactor Antineutrino Anomaly and could be caused by the existence of a light sterile neutrino eigenstate participating in the neutrino oscillation phenomenon. Introducing a sterile state implies the presence of a fourth mass eigenstate, while global fits favour oscillation parameters around $\sin^{2}(2θ)=0.09$ and $Δm^{2}=1.8\textrm{eV}^{2}$. The STEREO experiment was built to finally solve this puzzle. It is one of the first running experiments built to search for eV sterile neutrinos and takes data since end of 2016 at ILL Grenoble, France. At a short baseline of 10 metres, it measures the antineutrino flux and spectrum emitted by a compact research reactor. The segmentation of the detector in six target cells allows for independent measurements of the neutrino spectrum at multiple baselines. An active-sterile flavour oscillation could be unambiguously detected, as it distorts the spectral shape of each cell's measurement differently. This contribution gives an overview on the STEREO experiment, along with details on the detector design, detection principle and the current status of data analysis.
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