Sterile Neutrino Search in the Neutrino-4 Experiment at the SM-3 Reactor

Serebrov, A. P.; Ivochkin, V. G.; Samoilov, R. M.; Fomin, A. K.; Polyushkin, A. O.; Zinoviev, V. G.; Neustroev, P.; Golovtsov, V.; Chernyj, A. V.; Zherebtsov, O. M.; Chaikovskii, M. E.; Martemyanov, V. P.; Tarasenkov, V. G.; Aleshin, V. I.; Петелин, А. Л.; Izhutov, A. L.; Tuzov, A. A.; Sazontov, S. A.; Gromov, M. O.; Afanasiev, V. V.; Zaytsev, M. E.; Ryazanov, D. K.

doi:10.1134/s1063779618040482

Cited by 8 publications

(11 citation statements)

References 5 publications

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“…These also need to be combined and included in with the older experiments. These experiments are Nucifer [10], NEOS [11], Nuetrino-4 [12], DANSS [13], and PROSPECT [14]. As these experiments should be more reliable than the older experiments, the question of coherence becomes a more important consideration.…”

Section: Discussionmentioning

confidence: 99%

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Neutrino oscillations: The ILL experiment revisited

et al. 2019

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The ILL experiment, one of the "reactor anomaly" experiments, is re-examined. ILL's baseline of 8.78 m is the shortest of the reactor anomaly short baseline experiments, and it is the experiment that finds the largest fraction of the electron antineutrinos disappearing -about 20%. Previous analyses, if they do not ignore the ILL experiment, use functional forms for chisquare which are either totally new and unjustified, are the magnitude chisquare (also termed a "rate analysis"), or utilize a spectral form for chisquare which double counts the systematic error. We do an analysis which utilizes the standard, conventional form for chisquare as well as a derived functional form for a spectral chisquare. We find that when analyzed with a conventional chisquare that includes spectral information or with a spectral chisquare that is independent of the magnitude of the flux, the results are a set of specific values for possible mass-squared differences of the fourth neutrino and where the minimum chisquare difference values are significantly enhanced over previous analyses of the ILL experiment. For the Huber flux and the conventional chisquare, the two most preferred values are mass-squared differences of 0.90 and 2.36 eV 2 preferred at ∆χ 2 min values of -12.1 and -13.0 (3.5 and 3.6 σ), respectively. For the Daya Bay flux and conventional chisquare we find 0.95 and 2.36 eV 2 preferred at ∆χ 2 min of -8.22 and -9.45 (2.9 and 3.1 σ), respectively. For the spectral chisquare and either flux these values are 0.95 and 2.36 eV 2 preferred at ∆χ 2 min of -10.5 and -11.7(3.2 and 3.4 σ), respectively. These are to be compared to -4.4 (2.1 σ) found in the original reactor anomaly anaysis for all of the experiments excepting the ILL experiment.

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Section: Discussionmentioning

confidence: 99%

“…• There are five recent reactor antineutrino oscillation experiments: Nucifer [10], NEOS [11], Neutrino-4 [12], DANSS [13], and PROSPECT [14]. A flux independent analysis of [11] and [13] combined with the Gallium [7] experiments is presented in Ref.…”

Section: Introductionmentioning

confidence: 99%

Neutrino oscillations: The ILL experiment revisited

et al. 2019

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“…In this connection, model-independent methods that do not require knowledge of the non-oscillating ν e spectrum at the reactor should be mentioned. Such methods were, in particular, used in the experiment Neutrino-4 [88,89] (see also [90][91][92] for earlier results and further references) and in the recent combined analysis of RENO and NEOS data [93] (since the RENO and NEOS detectors share the same reactor complex, this analysis removes the ν e source dependency in the previous NEOS sterile neutrino search [78]). The results of these experiments provide intriguing evidence in favor of the "3 + 1" scenario, although they appear to be in deep conflict with each other.…”

Section: Extra Neutrinos or Miscalculated Flux?mentioning

confidence: 99%

Reactor Antineutrino Anomaly Reanalysis in Context of Inverse-Square Law Violation

Naumov

Shkirmanov

2021

Universe

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We discuss a possibility that the so-called reactor antineutrino anomaly (RAA), which is a deficit of the ν¯e rates in the reactor experiments in comparison to the theoretical expectations, can at least in part be explained by applying a quantum field-theoretical approach to neutrino oscillations, which in particular predicts a small deviation from the classical inverse-square law at short (but still macroscopic) distances between the neutrino source and detector. An extensive statistical analysis of the current reactor data on the integrated ν¯e event rates vs. baseline is performed to examine this speculation. The obtained results are applied to study another long-standing puzzle—gallium neutrino anomaly (GNA), which is a missing νe flux from 37Ar and 51Cr electron-capture decays as measured by the gallium–germanium solar neutrino detectors GALLEX and SAGE.

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“…Sterile neutrinos are hypothetical particles that have been invoked to explain anomalies in short baseline accelerator decay-at-rest [1] and decay-in-flight experiments [2], reactor neutrino fluxes [3,4] and radioactive source experiments [5]. In low-energy, short baseline experiments that are sensitive to ν e appearance, matter effects can be neglected and an oscillation of the form: P ν µ →ν e = sin 2 2θ µe sin 2 ∆m 2 L 4E (1) is predicted.…”

Section: Introductionmentioning

confidence: 99%

IceCube Sterile Neutrino Searches

Jones

2019

EPJ Web Conf.

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Anomalies in short baseline experiments have been interpreted as evidence for additional neutrino mass states with large mass splittings from the known, active flavors. This explanation mandates a corresponding signature in the muon neutrino disappearance channel, which has yet to be observed. Searches for muon neutrino disappearance at the IceCube neutrino telescope presently provide the strongest limits in the space of mixing angles for eVscale sterile neutrinos. This proceeding for the Very Large Volume Neutrino Telescopes (VLVnT) Workshop summarizes the IceCube analyses that have searched for sterile neutrinos and describes ongoing work toward enhanced, high-statistics sterile neutrino searches. *

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Sterile Neutrino Search in the Neutrino-4 Experiment at the SM-3 Reactor

Cited by 8 publications

References 5 publications

Neutrino oscillations: The ILL experiment revisited

Neutrino oscillations: The ILL experiment revisited

Reactor Antineutrino Anomaly Reanalysis in Context of Inverse-Square Law Violation

IceCube Sterile Neutrino Searches

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