The antineutrino energy structure in reactor experiments

Abstract

The recent observation of an energy structure in the reactor antineutrino spectrum is reviewed. The reactor experiments Daya Bay, Double Chooz and RENO have reported a consistent excess of antineutrinos deviating from the flux predictions, with a local significance of about 4$\sigma$ between 4 and 6 MeV of the positron energy spectrum. The possible causes of the structure are analyzed in this work, along with the different experimental approaches developed to identify its origin. Considering the available data and results from the three experiments, the most likely explanation concerns the reactor flux predictions and the associated uncertainties. Therefore, the different current models are described and compared. The possible sources of incompleteness or inaccuracy of such models are discussed, as well as the experimental data required to improve their precision.

References in corpus (4)

• Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam
• The Reactor Antineutrino Anomaly
• Improved measurements of the neutrino mixing angle ${\theta }_{13}$ with the Double Chooz detector
• Spectral Structure of Electron Antineutrinos from Nuclear Reactors

Cited by in corpus (7)

• Updated global analysis of neutrino oscillations in the presence of eV-scale sterile neutrinos
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• Current unknowns in the three neutrino framework
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• Precise Determination of the U-235 Reactor Antineutrino Cross Section per Fission
• Reactor Rate Modulation oscillation analysis with two detectors in Double Chooz
• Quasi-Sterile Neutrinos from Dark Sectors I. BSM matter effects in neutrino oscillations and the short-baseline anomalies