论文标题
搜索EV中微子无菌：立体声实验的状态
Search for eV neutrino sterile: Status of STEREO experiment
论文作者
论文摘要
自发现以来，反应堆中微子在理解中微子物理学方面发挥了关键作用。与最近出现的预测相比，所谓的反应堆反应器 - 抗神经反射式RAA，〜6.5 $ \％$ $ $ \％$的赤字与预测相比出现。这种异常可以通过第四个无菌中微子的存在来解释，目前正在通过非常短的基线实验立体声来检验该假设。自2016年11月以来，后者距离疾病的研究反应堆的紧凑型反应器的紧凑型核心在非常短的距离（9-11m）中安装。疾病核心高度富集在$ {}^{235} \ textrm {u} $中，并在58.3 mW的名义热力中释放。立体声检测器的几何形状被分割成六个填充GD载有GD的液体闪光灯的相同细胞，设计用于直接测试L/E范围内的新振荡模式，范围约为1 m/MeV，与RAA有关。立体声的首次发表的结果证明了反应器和宇宙射线引起的背景的缓解以及良好的能量响应。现在，数据正在进行中，非常稳定的条件有利于提高准确性。我们将介绍实验和无菌中微子分析的更新。还提出了对疾病反应器发出的中微子光谱的精致预测。
Reactor neutrinos have played a key role in understanding neutrino physics since their discovery. The so-called reactor-anti-neutrino-anomaly RAA, a ~6.5 $\%$ deficit of the mean observed neutrino flux compared to the prediction appeared recently. This anomaly could be interpreted by the existence of a fourth, sterile, neutrino and this hypothesis is currently being tested by the very short baseline experiment STEREO. The latter is installed at very short distance (9 -11m) from the compact core of the ILL research reactor in Grenoble-France and collecting data since November 2016. The ILL core is highly enriched in ${}^{235}\textrm{U}$ and releases a nominal thermal power of 58.3 MW. The geometry of the STEREO detector, segmented into six identical cells filled with Gd-loaded liquid scintillator, is designed for a direct test of a new oscillation pattern in the L/E range around 1 m/MeV, relevant for the RAA. First published results of STEREO have demonstrated the mitigation of the background induced by the reactor and the cosmic-rays and a good energy response. The data taking is now in progress with very stable conditions favorable for an improved accuracy. We will present an overview of the experiment and an update of the sterile neutrino analysis. A refined prediction of the neutrino spectrum emitted by the ILL reactor is also presented.
