First Observation of the Oscillation Effect in the Neutrino-4 Experiment on the Search for the Sterile Neutrino

被引：62

作者：

Serebrov, A. P. ^{[1
]}

Ivochkin, V. G. ^{[1
]}

Samoilov, R. M. ^{[1
]}

Fomin, A. K. ^{[1
]}

Polyushkin, A. O. ^{[1
]}

Zinoviev, V. G. ^{[1
]}

Neustroev, P. V. ^{[1
]}

Golovtsov, V. L. ^{[1
]}

Chernyj, A. V. ^{[1
]}

Zherebtsov, O. M. ^{[1
]}

Chaikovskii, M. E. ^{[1
]}

Martemyanov, V. P. ^{[2
]}

Tarasenkov, V. G. ^{[2
]}

Aleshin, V. I. ^{[2
]}

Petelin, A. L. ^{[3
]}

Izhutov, A. L. ^{[3
]}

Tuzov, A. A. ^{[3
]}

Sazontov, S. A. ^{[3
]}

Gromov, M. O. ^{[3
]}

Afanasiev, V. V. ^{[3
]}

Zaytsev, M. E. ^{[1
,4
]}

Gerasimov, A. A. ^{[1
]}

Ryazanov, D. K. ^{[4
]}

机构：

[1] Petersburg Nucl Phys Inst, Natl Res Ctr Kurchatov Inst, Gatchina 188300, Russia

[2] Natl Res Ctr Kurchatov Inst, Moscow 123182, Russia

[3] Res Inst Atom Reactors, Dimitrovgrad 433510, Ulyanovsk Regio, Russia

[4] Natl Res Nucl Univ MEPhI, Moscow Engn Phys Inst, Dimitrovgrad Engn & Technol Inst, Dimitrovgrad 433511, Ulyanovsk Regio, Russia

来源：

JETP LETTERS | 2019年 / 109卷 / 04期

关键词：

D O I：

10.1134/S0021364019040040

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report Neutrino-4 experiment results of measurements of reactor antineutrinos flux and spectrum dependence on the distance in range 6-12 m from the center of the reactor core. The fit of experimental dependence with the law 1/L-2, where L is the distance from the reactor center, gave satisfactory result with goodness of fit 81%. However, we discovered that the experimental neutrino spectrum is different from the calculated one. Using experimental spectrum, we performed the model independent analysis of restrictions on oscillation parameters m142 and sin(2) 2(14). The results of this analysis exclude area of reactor and gallium anomaly at CL more than 99.7% (>3 sigma) for values m 142 < 3 eV(2) and sin(2) 2(14) > 0.1. However, we observed an oscillation effect at CL 2.8 sigma in vicinity of m142 m142 approximate to 7.3 eV(2) and sin(2) 2(14) approximate to 0.39. The method of coherent addition of results of measurements, which allows us to directly observe the effect of oscillations, is proposed. The analysis of that effect is presented. In general, it seems that the effect predicted in gallium and reactor experiments is being confirmed but at sufficiently large value of m142. Future prospects of the experiment are discussed.

引用

页码：213 / 221

页数：9

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