The 5 MeV bump - a nuclear whodunit mystery

Abstract

We perform a combined analysis of recent NEOS and Daya Bay data on the reactor antineutrino spectrum. This analysis includes approximately 1.5 million antineutrino events, which is the largest neutrino event sample analyzed to date. We use a double ratio which cancels flux model dependence and related uncertainties as well as the effects of the detector response model. We find at 3-4 standard deviation significance level, that plutonium-239 and plutonium-241 are disfavored as the single source for the the so-called 5 MeV bump. This analysis method has general applicability and in particular with higher statistics data sets will be able to shed significant light on the issue of the bump. With some caveat this also should allow to improve the sensitivity for sterile neutrino searches in NEOS.

arXiv comment4 pages, 2 figures, version to appear in Phys. Rev. Lett

References in corpus (13)

• Improved Predictions of Reactor Antineutrino Spectra
• On the determination of anti-neutrino spectra from nuclear reactors
• Observation of Energy and Baseline Dependent Reactor Antineutrino Disappearance in the RENO Experiment
• Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay
• Spectral Structure of Electron Antineutrinos from Nuclear Reactors
• Experimental Determination of the Antineutrino Spectrum of the Fission Products of ${}^{238}$U
• The Possible Origin and Implications of the Shoulder in Reactor Neutrino Spectra
• Total Absorption Spectroscopy Study of ${}^{92}$Rb Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape
• New Results from RENO and The 5 MeV Excess
• Measurement of ${\theta }_{13}$ in Double Chooz using neutron captures on hydrogen with novel background rejection techniques
• Reactor antineutrino fluxes - status and challenges
• Investigating the Spectral Anomaly with Different Reactor Antineutrino Experiments
• Precise Determination of the U-235 Reactor Antineutrino Cross Section per Fission

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