Particle physics origin of the 5 MeV bump in the reactor antineutrino spectrum?

Berryman, Jeffrey M.; Brdar, Vedran

doi:10.1103/physrevd.99.055045

Cited by 23 publications

(15 citation statements)

References 72 publications

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“…The blue line is the old prediction, the red line is the new one (including the effect due to non-zero θ 13 ). More recent experiments have consistently measured fluxes in accordance with the old calculations.excess, and not a deficit, it cannot be explained by simple oscillations (even though there are some exotic explanations, see Ref [17]…”

supporting

confidence: 54%

Report on scipost_201810_00001v1

2018

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Light sterile neutrinos, first proposed after the results of the LSND experiment, have been a polemical topic for the last decades after seemingly contradictory data appeared from different experiments. In this overview, I review the experimental hints that point towards sterile neutrinos as well as their statistical compatibility. Even though the muon neutrino disappearance experiments strongly rule out vanilla sterile neutrinos, each oscillation channel remains internally mostly consistent. In any case, in the near future a series of independent and precise experiments should finally settle down this issue.

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supporting

confidence: 54%

Report on scipost_201810_00001v1

2018

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“…The statistical significance in all mentioned experiments is beyond doubt and thus the observed excess appears to be baseline independent. It is currently unclear which physics are responsible for this bump, although several possibilities have been proposed to explain it [81][82][83][84] (see also [85][86][87] for further discussion and references). This problem complicates the study of the IBD spectrum distortions mediated by sterile neutrinos but might have little or no relation to the reactor rate anomaly.…”

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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“…At present there is no unique final explanation of this "anomaly" and the problem is still under investigation, but the different analyses [61][62][63] seem to indicate a probable correlation with the reactor power and fuel composition evolution and with the knowledge of the flux from the different fissile products, mainly from the ones generated by 235 U and 239 Pu. Alternative solutions based on a particle origin of the anomaly and predicting non standard interactions are still viable, but less probable [64].…”

Section: Open Issues In Sbl Reactor Experimentsmentioning

confidence: 99%

Present and Future Contributions of Reactor Experiments to Mass Ordering and Neutrino Oscillation Studies

Antonelli¹,

Miramonti²,

Ranucci³

2020

Universe

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After a long a glorious history, marked by the first direct proofs of neutrino existence and of the mixing between the first and third neutrino generations, the reactor antineutrino experiments are still well alive and will continue to give important contributions to the development of elementary particle physics and astrophysics. In parallel to the SBL (short baseline) experiments, that will be dedicated mainly to the search for sterile neutrinos, a new kind of experiments will start playing an important role: reactor experiments with a “medium” value, around 50 km, of the baseline, somehow in the middle between the SBL and the LBL (long baselines), like KamLAND, which in the recent past gave essential contributions to the developments of neutrino physics. These new medium baseline reactor experiments can be very important, mainly for the study of neutrino mass ordering. The first example of this kind, the liquid scintillator JUNO experiment, characterized by a very high mass and an unprecedented energy resolution, will soon start data collecting in China. Its main aspects are discussed here, together with its potentialities for what concerns the mass ordering investigation and also the other issues that can be studied with this detector, spanning from the accurate oscillation parameter determination to the study of solar neutrinos, geoneutrinos, atmospheric neutrinos and neutrinos emitted by supernovas and to the search for signals of potential Lorentz invariance violation.

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Particle physics origin of the 5 MeV bump in the reactor antineutrino spectrum?

Cited by 23 publications

References 72 publications

Report on scipost_201810_00001v1

Report on scipost_201810_00001v1

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

Present and Future Contributions of Reactor Experiments to Mass Ordering and Neutrino Oscillation Studies

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