STEREO neutrino spectrum of ^235U fission rejects sterile neutrino hypothesis-猫眼课题宝

DOI：

10.1038/s41586-022-05568-2

发表时间：

2022-10

期刊：

Nature

影响因子：

64.8

通讯作者：

中科院分区：

综合性期刊1区

文献类型：

作者：

H. Almaz'an;L. Bernard;A. Blanchet;A. Bonhomme;C. Buck;A. Chalil;P. Sanchez;I. E. Atmani;L. Labit;J. Lhuillier;M. Licciardi;M. Lindner;T. Materna;H. Pessard;J.-S. R'eal;J. Ricol;C. Roca;R. Rogly;T. Salagnac;V. Savu;Stefan Schoppmann;T. Soldner;A. Stutz;M. Vialat

过去中微子测量中的异常现象导致发现这些粒子具有非零质量，并且在传播时在它们的三种味道之间振荡。在2010年代，在核反应堆发射的反中微子光谱中观察到的类似异常引发了一种假设，即存在一种补充中微子状态，这种状态是无菌的，也就是说，不通过弱相互作用相互作用。STEREO实验，-被设计来研究这个猜想，这可能会扩展粒子物理学的标准模型。在这里，我们对STEREO生成的全套数据进行了分析，证实了观察到的异常现象，同时拒绝了轻无菌中微子的假设。STEREO安装在劳厄-朗之万研究所（ILL）的研究反应堆中，精确地测量与235铀裂变相关的反中微子能谱。探测器的分割及其到紧凑核心的非常短的距离是STEREO用于我们分析的关键属性。测得的反中微子能谱表明，异常起源于用于预测的核实验数据中的偏差。我们的结果支持了标准模型的中微子含量，并为235 U反中微子能谱建立了新的参考。我们预计，这一结果将允许对中微子的基本性质进行更精细的测试，但也可以为反应堆物理学以及天体物理或地球中微子的观测提供基准模型和核数据。

Anomalies in past neutrino measurements have led to the discovery that these particles have non-zero mass and oscillate between their three flavours when they propagate. In the 2010s, similar anomalies observed in the antineutrino spectra emitted by nuclear reactors have triggered the hypothesis of the existence of a supplementary neutrino state that would be sterile, that is, not interacting by means of the weak interaction. The STEREO experiment, , , –was designed to investigate this conjecture, which would potentially extend the standard model of particle physics. Here we present an analysis of the full set of data generated by STEREO, confirming observed anomalies while rejecting the hypothesis of a light sterile neutrino. Installed at the Institut Laue–Langevin (ILL) research reactor, STEREO accurately measures the antineutrino energy spectrum associated to the fission of235U. The segmentation of the detector and its very short distance to the compact core are crucial properties of STEREO for our analysis. The measured antineutrino energy spectrum suggests that anomalies originate from biases in the nuclear experimental data used for the predictions,. Our result supports the neutrino content of the standard model and establishes a new reference for the235U antineutrino energy spectrum. We anticipate that this result will allow progress towards finer tests of the fundamental properties of neutrinos but also to benchmark models and nuclear data of interest for reactor physics,and for observations of astrophysical or geoneutrinos,.

STEREO neutrino spectrum of ^235U fission rejects sterile neutrino hypothesis

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