Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experiment Neutrino-4 and restrictions for sterile neutrino   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.

33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org