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

Serebrov, A. P.; Ivochkin, V. G.; Samoilov, R. M.; Fomin, A. K.; Zinov’ev, V. G.; Neustroev, P.; Golovtsov, V.; Gruzinskii, N.; 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.; Izhutov, A. L.; Sazontov, S. A.; Ryazanov, D. K.; Gromov, M. O.; Афанасьев, В. В.; Matrosov, L. N.; Matrosova, M. Yu.

doi:10.1134/s106378421512018x

Cited by 12 publications

(6 citation statements)

References 10 publications

(16 reference statements)

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“…Unfortunately, a research reactor beam hall usually has quite a large background of neutrons and gamma quanta, which makes it difficult to carry out low background experiments. Due to some peculiar characteristics of its construction, reactor SM-3 provides the most favorable conditions to search for neutrino oscillations at short distances [4,5]. However, SM-3 reactor, as well as other research reactors, is located on the Earth surface, hence, cosmic background is the major difficulty in considered experiment.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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We report Neutrino-4 experiment results of measurements of reactor antineutrinos flux and spectrum dependence on the distance in range 6-12 meters 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 ∆m 14 2 and sin 2 2 14 . The results of this analysis exclude area of reactor and gallium anomaly at CL more than 99.7% (> 3 ) for values ∆m 14 2 < 3eV 2 and sin 2 2θ 14 > 0.1 However, we observed an oscillation effect at CL 2.8 in vicinity of ∆m 14 2 ≈ 7.34eV 2 and sin 2 2θ 14 ≈ 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 confirmed but at sufficiently large value of ∆m 14 2 . Future prospects of the experiment are discussed.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…We applied the method of delayed coincidences with time interval of 100 µs and managed to distinguish correlated events with rate of 1 s -1 . Most of these events are signals from muons stopped inside the detector and absorbed by nuclei with emission of 4 neutrons. Energy discrimination allows us to lower correlated event rate to 0.1s -1 [4,5].…”

Section: The Problem With Reactor Antineutrino Detection In the Presementioning

confidence: 99%

“…Advantages of SМ-3 reactor are a compact reactor core (35×42×42 сm 3 ) with high reactor power being equal to 100 MW, as well as а sufficiently short distance (5 m) from the reactor core to the wall of an experimental hall. Besides, the fact of special significance is that an 3 antineutrino beam can be measured within a sufficiently wide range from 6 to 13 meters [3,4]. However, SM-3 reactor is at the Earth surface, hence cosmic background is the main difficulty with this experiment.…”

Section: Introductionmentioning

confidence: 99%

Neutrino-4 experiment on search for sterile neutrino with multi-section model of detector

Serebrov¹,

Ivochkin²,

Samoilov³

et al. 2017

J. Phys.: Conf. Ser.

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In order to carry out research in the field of possible existence of a sterile neutrino the laboratory based on SМ-3 reactor (Dimitrovgrad, Russia) was created to search for oscillations of reactor antineutrino. The prototype of a multi-section neutrino detector with liquid scintillator volume of 350 l was installed in the middle of 2015. It is a moveable inside the passive shielding detector, which can be set at distance range from 6 to 11 meters from the reactor core. Measurements of antineutrino flux at such small distances from the reactor core are carried out with moveable detector for the first time. The measurements carried out with detector prototype demonstrated a possibility of measuring a reactor antineutrino flux in difficult conditions of cosmic background at Earth surface. * serebrov@pnpi.spb.ru

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“…It is expected that in the coming several years it will be possible to confirm or deny the existence of such anomalies and light SNs (see, for example, Refs. 23,28,[35][36][37][38]. Besides, HN with masses from several keV to several TeV are often used to explain some astrophysical data 22,39,40 .…”

Section: Introductionmentioning

confidence: 99%

Sterile neutrinos influence on oscillation characteristics of active neutrinos at short distances in the generalized model of neutrino mixing

Khruschov

Фомичев

2019

Int. J. Mod. Phys. A

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A phenomenological model with active and sterile neutrinos is used for calculations of neutrino oscillation characteristics at the normal mass hierarchy of active neutrinos. Taking into account the contributions of sterile neutrinos, appearance and survival probabilities for active neutrinos are calculated. Modified graphical dependencies for the probability of appearance of electron neutrinos/antineutrinos in muon neutrino/antineutrino beams as a function of the ratio of the distance to the neutrino energy and other model parameters are obtained. It is shown that in the case of a certain type mixing between active and sterile neutrinos it is possible to clarify some features of the anomalies of neutrino data at short distances. A new parametrization for a particular type mixing matrix of active and sterile neutrinos that takes into account the additional sources of CP violation is used. The theoretical results obtained for mixing of active and sterile neutrinos can be applied for interpretation and prediction of results of ground-based experiments on search of sterile neutrinos as well as for the analysis of some astrophysical data.

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

Cited by 12 publications

References 10 publications

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

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

Neutrino-4 experiment on search for sterile neutrino with multi-section model of detector

Sterile neutrinos influence on oscillation characteristics of active neutrinos at short distances in the generalized model of neutrino mixing

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