The first observation of effect of oscillation in Neutrino-4 experiment on search for sterile neutrino (continuation)

Abstract

We present the results of the Neutrino-4 experiment on search for a sterile neutrino. The experiment has been carried out on the SM-3 reactor having a compact active zone of $42\times 42\times 35{\text{cm}}^3$ and operating on the highly enriched uranium-235 at 90 MW thermal power. We report the results of the Neutrino-4 experiment of measurements of reactor antineutrino flux and spectrum dependence on the distance in the range 6-12 meters from the center of the reactor core. Using the measured spectrum and the distance dependence of antineutrino flux, we performed the model independent analysis of restrictions on the oscillation parameters $\Delta m_{14}^2$ and ${\sin }^{2}2{\theta }_{14}$. The method of coherent addition of results of measurements is proposed. It allows us to directly observe the effect of oscillations. We observed the oscillation effect at CL $3.5\sigma$ in the vicinity of $\Delta m_{14}^2\approx 7.26{\text{eV}}^2$ and ${\sin }^{2}2{\theta }_{14}\approx 0.38$. Combining the result of the Neutrino-4 experiment and the result of the gallium anomaly effect we obtained value ${\sin }^{2}2{\theta }_{14}\approx 0.35\pm 0.07(5\sigma )$. The analysis of systematics effects is presented. Comparison with results of other experiments is presented. Future prospect of the experiment is discussed. It is necessary to notice that obtained values ${\sin }^{2}2{\theta }_{14}\approx 0.35\pm 0.07(5\sigma )$ and $\Delta m_{14}^2\approx (7.3\pm 0.7){\text{eV}}^2$ allow make assessment on the mass of a neutrino: $m_{\beta }\approx 0.8\text{eV}$.

arXiv comment16 pages, 28 figures

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