On the possibility of experimentally confirming the hypothesis of reactor antineutrino passage into a sterile state

Serebrov, A. P.; Fomin, A. K.; Zinov’ev, V. G.; Loginov, Yu.E.; Onegin, M. S.; Gagarskiy, A. M.; Petrov, G. A.; Соловей, В. А.; Chernyi, A. V.; Zherebtsov, O. M.; Martemyanov, V. P.; Tsinoev, V. G.; Tarasenkov, V. G.; Aleshin, V. I.; Петелин, А. Л.; Павлов, С. В.; Svyatkin, M. N.; Izhutov, A. L.; Sazontov, S. A.; Ryazanov, D. K.; Gromov, M. O.; Khramkov, N. S.; Rykalin, V.I.

doi:10.1134/s1063785013070225

Cited by 11 publications

(7 citation statements)

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“…The Neutrino-4 experiment started in 2014, at first on a model, then on a full-scale detector and, for the first time in the world, has provided measurement data on dependence of the reactor antineutrinos flux on the distance within 6 -12 meters [17][18][19][20]. Attempts to suppress the background of fast neutrons by means of sectioning the detector has given the required result.…”

Section: Conclusion On the Current Experimental Resultsmentioning

confidence: 99%

Status of Experiment NEUTRINO-4 Search for Sterile Neutrino

Serebrov

Ivochkin

Samoilov

et al. 2017

J. Phys.: Conf. Ser.

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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 signal/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 2 1/ L 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 2 14 m  and 2 14 sin (2 )  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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Section: Conclusion On the Current Experimental Resultsmentioning

confidence: 99%

Status of Experiment NEUTRINO-4 Search for Sterile Neutrino

Serebrov

Ivochkin

Samoilov

et al. 2017

J. Phys.: Conf. Ser.

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“…This level is determined by cosmic radiation neutrons and, practically, is independent of the reactor operation. Measurements of thermal neutron fluxes were made with 3 He detector, which represents itself a proportional counter 1 m long with the diameter of 3 сm. For registration of fast neutrons one used the same proportional 3 He detector, but it was put into the shielding made of polyethylene (thickness of layer is 5 сm), which in its turn was wrapped in a layer of borated rubber (3 mm thick, containing 50% of boron).…”

Section: Estimations Of Fluxes Of Fast and Thermal Neutrons In The Nementioning

confidence: 99%

“…Extinction coefficient of thermal neutrons of the borated rubber was about 400 times, which enabled to separate reliably fast neutrons from thermal ones. For changing count rate (s -1 ) of proportional 3 He detector into density units of fast neutron flux (сm -2 ·s -1 ), a newly created fast neutron detector was calibrated according to recordings of a conventional one МКС АТ6102. For this purpose both detectors were placed side by side at the distance of 3 m from a neutron source (Pu-Be) without a thermalizer.…”

Section: Estimations Of Fluxes Of Fast and Thermal Neutrons In The Nementioning

confidence: 99%

“…As a result, one obtained a coupling coefficient for a count rate of the detector and of fast neutron flux F fast (n·сm -2 ·s -1 ) = 0.033·N fast (s -1 ) for the neutron flux orthogonal to detector axis. For calibration of 3 He thermal neutron counter one applied a similar technique with a conventional detector of thermal neutrons МКС-АТ6102 and a neutron source (Pu-Be) with water moderator. Coefficient of coupling between a thermal neutron flux and a detector count rate is given by the following equation F th (n·сm -2 ·s -1 ) = 0.013·N th (s -1 ).…”

Section: Estimations Of Fluxes Of Fast and Thermal Neutrons In The Nementioning

confidence: 99%

“…With the view of preparation for the experiment «Neutrino-4» by SМ-3 reactor [3][4][5][6] we did an experimental research with a detector model «Neutrino-4» at WWR-М reactor. An experimental task was to register reactor antineutrino in the conditions of high background of cosmic radiation on the surface of the Earth as well as in the conditions of neutron and gamma background in an experimental hall of a research reactor.…”

Section: A Neutrino Detector Model and Its Testing By Wwr-м Reactormentioning

confidence: 99%

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Creation of neutrino laboratory for carrying out experiment on search for a sterile neutrino at the SM-3 reactor

et al. 2015

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In connection with the question of possible existence of sterile neutrino the laboratory on the basis of SМ-3 reactor was created to search for oscillations of reactor antineutrino. A prototype of a neutrino detector with scintillator volume of 400 l can be moved at the distance of 6-11m from the reactor core. The measurements of background conditions have been made. It is shown that the main experimental problem is associated with cosmic radiation background. Test measurements of dependence of a reactor antineutrino flux on the distance from a reactor core have been made. The prospects of search for oscillations of reactor antineutrino at short distances are discussed.

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