arXiv · 1708.00421
Experiment Neutrino-4 and restrictions for sterile neutrino
Abstract
The experiment "Neutrino-4" started in 2014 on a model, then it was continued on a full-scale detector, and now, has provided the measurement result on dependence of the flux and spectrum of reactor antineutrinos on the distance of 6 - 12 meters from the center of the reactor. One of the main problems is the correlated background from fast neutrons caused by space radiation. Attempts to suppress the background of fast neutrons by sectioning the detector have given some result. The relation of effect/background has improved up to 0.6. As a result, measurements of the difference in the counting rate of neutrino-like events (reactor ON - reactor OFF) have been obtained as dependence on distance from the reactor center. The fit of experimental dependence with the law $1/L^2$ give satisfactory result. The goodness of that fit is 81%. However, there was discovered experimental neutrino spectrum difference from calculated one. With achieved accuracy this difference does not change with distance. Therefore it cannot be interpreted as oscillations. Calculated spectrum form correction for experimental allow us to make proper analysis of oscillation parameters $\Delta m^2_{14}$ and $\sin^2(2\theta)$ limitations. Result of this analysis is exclusion of reactor and gallium anomalies area with 95% CL. Experiment future perspectives are discussed.
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A. P. Serebrov, V. G. Ivochkin, R. M. Samoilov, A. K. Fomin, A. O. Polyushkin, V. G. Zinoviev, P. V. Neustroev, V. L. Golovtsov, A. V. Chernyj, O. M. Zherebtsov, M. E. Chaikovskii, V. P. Martemyanov, V. G. Tarasenkov, V. I. Aleshin, A. L. Petelin, A. L. Izhutov, A. A. Tuzov, S. A. Sazontov, M. O. Gromov, V. V. Afanasiev, M. E. Zaytsev, D. K. Ryazanov. 2017-08-01. Experiment Neutrino-4 and restrictions for sterile neutrino. https://arxiv.org/abs/1708.00421
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