Search for sterile neutrinos with the Neutrino-4 experiment and measurement results
Search for sterile neutrinos with the Neutrino-4 experiment and measurement results
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DOI：
10.1103/physrevd.104.032003
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发表时间：
2021-08
影响因子：
5
通讯作者：
A. Serebrov;R. Samoilov;V. Ivochkin;A. Fomin;V. Zinoviev;P. Neustroev;V. Golovtsov;S. Volkov;A. Chernyj;O. Zherebtsov;M. Chaikovskii;A. Petelin;A. Izhutov;A. Tuzov;S. Sazontov;M. Gromov;V. Afanasiev;M. Zaytsev;A. Gerasimov;V. Fedorov
中科院分区：
文献类型：
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作者：
A. Serebrov;R. Samoilov;V. Ivochkin;A. Fomin;V. Zinoviev;P. Neustroev;V. Golovtsov;S. Volkov;A. Chernyj;O. Zherebtsov;M. Chaikovskii;A. Petelin;A. Izhutov;A. Tuzov;S. Sazontov;M. Gromov;V. Afanasiev;M. Zaytsev;A. Gerasimov;V. Fedorov
中微子-4实验于2014年开始使用探测器模型，并在2016-2021年继续使用全尺寸探测器。在这篇文章中，我们描述了这个实验的准备工作的所有步骤。我们提出了所有的中微子-4实验的结果，增加了统计精度提供的日期。实验装置的构建是为了测量反应堆反中微子的通量和光谱作为到SM-3反应堆（Dimitrovgrad，俄罗斯）的活性区中心的距离的函数在6-12米的范围内。使用所有收集的数据，我们进行了独立于模型的分析，以确定振荡参数和。测量结果的相干求和方法使我们能够直接证明振荡效应。我们提出了可能的系统误差的分析和MC模型的实验，它认为在目前的精度水平的影响表现的可能性。分析结果表明，在现有的统计精度下，我们观察到的振荡参数为Δm142=（7.3±0.13st±1.16syst）eV ~ 2 =（7.3±1.17）eV ~ 2和。基于蒙特卡罗的统计分析给出了置信水平的估计。我们计划改进目前的实验装置，并创建一个全新的装置，以便将实验的准确性提高3倍。我们还提供了一个简单的分析，在寻找不育中微子的一般实验情况。
The experiment Neutrino-4 started in 2014 with a detector model and continued with a full-scale detector in 2016–2021. In this article, we describe all the steps of the preparatory work on this experiment. We present all results of the Neutrino-4 experiment with increased statistical accuracy provided to date. The experimental setup is constructed to measure the flux and spectrum of the reactor antineutrinos as a function of distance to the center of the active zone of the SM-3 reactor (Dimitrovgrad, Russia) in the range of 6–12 meters. Using all the collected data, we performed a model-independent analysis to determine the oscillation parametersand. The method of coherent summation of measurement results allows us to directly demonstrate the oscillation effect. We present the analysis of possible systematic errors and the MC model of the experiment, which considers the possibility of the effect manifestation at the present precision level. As a result of the analysis, we can conclude that at currently available statistical accuracy, we observe the oscillations at thelevel with the parameters Δm142=(7.3±0.13st±1.16syst) eV2=(7.3±1.17) eV2 and. Monte Carlo based statistical analysis gave an estimation of the confidence level at. We plan to improve the currently working experimental setup and create a completely new setup in order to increase the accuracy of the experiment by 3 times. We also provide a brief analysis of the general experimental situation in the search for sterile neutrinos.