Search for sterile neutrinos with the Neutrino-4 experiment and measurement results

Serebrov, A. P.; Samoilov, R. M.; Ivochkin, V. G.; Fomin, A. K.; Zinoviev, V. G.; Neustroev, P.; Golovtsov, V.; Volkov, S.; Chernyj, A. V.; Zherebtsov, O. M.; Chaikovskii, M. E.; Петелин, А. Л.; Izhutov, A. L.; Tuzov, A. A.; Sazontov, S. A.; Gromov, M. O.; Afanasiev, V. V.; Zaytsev, M. E.; Gerasimov, A.; Федоров, В. В.

doi:10.1103/physrevd.104.032003

Cited by 90 publications

(82 citation statements)

References 34 publications

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“…STEREO are currently analysing their phase-III data, which adds comparable statistics to their phase-II data [25]. Neutrino-4 is planning to establish a second experimental site which will accommodate a three-fold more sensitive detector in order to confirm their results [36]. PROSPECT plans a detector upgrade possibly also involving deployment at a HEU and LEU reactor to resolve isotopic dependencies [65].…”

Section: Discussionmentioning

confidence: 99%

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Status of Anomalies and Sterile Neutrino Searches at Nuclear Reactors

Schoppmann

2021

Universe

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Two anomalies at nuclear reactors, one related to the absolute antineutrino flux, one related to the antineutrino spectral shape, have drawn special attention to the field of reactor neutrino physics during the past decade. Numerous experimental efforts have been launched to investigate the reliability of flux models and to explore whether sterile neutrino oscillations are at the base of the experimental findings. This review aims to provide an overview on the status of experimental searches at reactors for sterile neutrino oscillations and measurements of the antineutrino spectral shape in mid-2021. The individual experimental approaches and results are reviewed. Moreover, global and joint oscillation and spectral shape analyses are discussed. Many experiments allow setting of constraints on sterile oscillation parameters, but cannot yet cover the entire relevant parameter space. Others find evidence in favour of certain parameter space regions. In contrast, findings on the spectral shape appear to give an overall consistent picture across experiments and allow narrowing down of contributions of certain isotopes.

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Section: Discussionmentioning

confidence: 99%

“…The Neutrino-4 experiment [36] started collecting data in 2016 at the SM-3 HEU reactor in Dimitrovgrad, Russia, which offers a compact core of 35 × 42 × 42 cm 3 and exhibits 100 MW thermal power. Neutrinos are detected inside a 0.1% Gd-LS detector segmented into 5 × 10 cells with an overall volume of 1.8 m 3 .…”

Section: Neutrino-4mentioning

confidence: 99%

Status of Anomalies and Sterile Neutrino Searches at Nuclear Reactors

Schoppmann

2021

Universe

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“…Nevertheless, ORCA has a competitive sensitivity to Daya Bay+Bugey-3 [44] and STEREO [46] in the HF region. Moreover, ORCA will also be able to test part of the Neutrino-4 allowed region [47]. On the contrary, the global fit regions can not be reached with three years of data taking.…”

Section: Sensitivity To θ 24 For Different ∆M 2 41 Valuesmentioning

confidence: 99%

“…Sensitivity results are compared with current upper limits from cosmology [13], STEREO [46], and Daya Bay+Bugey-3 [44]. Current anomaly regions are also reported, from Neutrino-4 [47], global fits [9] and reactors global fits [48]. The excluded region is the one on the right of the lines.…”

Section: Sensitivity To θ 24 For Different ∆M 2 41 Valuesmentioning

confidence: 99%

Sensitivity to light sterile neutrino mixing parameters with KM3NeT/ORCA

Aiello

López

Díaz

et al. 2021

J. High Energ. Phys.

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KM3NeT/ORCA is a next-generation neutrino telescope optimised for atmospheric neutrino oscillations studies. In this paper, the sensitivity of ORCA to the presence of a light sterile neutrino in a 3+1 model is presented. After three years of data taking, ORCA will be able to probe the active-sterile mixing angles θ14, θ24, θ34 and the effective angle θμe, over a broad range of mass squared difference $$ \Delta {m}_{41}^2 $$ ∆ m 41 2 ∼ [10−5, 10] eV2, allowing to test the eV-mass sterile neutrino hypothesis as the origin of short baseline anomalies, as well as probing the hypothesis of a very light sterile neutrino, not yet constrained by cosmology. ORCA will be able to explore a relevant fraction of the parameter space not yet reached by present measurements.

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“…These experiments use neutrinos produced predominantly by three means: nuclear decay in the MeV range, pion decay at rest in the 100 MeV scale, and pion or kaon decay in flight in the highest energy range. In the lowest energy range, reactor experiments have performed searches for the presence of electron-antineutrino disappearance by comparing observations to theoretical predictions of the rates [3][4][5][6][7][8][9] or by searching for oscillatory patterns in measurements performed at different positions [10][11][12][13][14][15][16][17][18]. These have yielded confirmatory signals that range in significance from ∼ 2 to more than 5 sigma, but at the same time have yielded constraints that are in contradiction with these observations [19].…”

mentioning

confidence: 99%

Impact of Wave Packet Separation in Low-Energy Sterile Neutrino Searches

Argüelles¹,

Bertólez-Martínez²,

Salvadó³

2022

Preprint

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Light sterile neutrinos have been motivated by anomalies observed in short-baseline neutrino experiments. Among them, radioactive-source and reactor experiments have provided evidence and constraints, respectively, for electron-neutrino disappearance compatible with an eV-scale neutrino. These seemingly conflicting results have been derived under the approximation that the neutrino wave package can be approximated as a plane wave. This letter demonstrates that when the neutrino wave package is taken into account, the tension between the different electron-flavor observations and constraints are resolved. Based on this study, in the future all results should be presented with zero and maximal wavepacket effects, since the true value must lie in between.

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Search for sterile neutrinos with the Neutrino-4 experiment and measurement results

Cited by 90 publications

References 34 publications

Status of Anomalies and Sterile Neutrino Searches at Nuclear Reactors

Status of Anomalies and Sterile Neutrino Searches at Nuclear Reactors

Sensitivity to light sterile neutrino mixing parameters with KM3NeT/ORCA

Impact of Wave Packet Separation in Low-Energy Sterile Neutrino Searches

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