Shell-model shape factors for 36 first-forbidden beta decays shift predicted reactor antineutrino spectra by 4-5% in the 4-7 MeV range, making forbidden transitions a necessary ingredient in reactor anomaly analyses.
The 5 MeV bump - a nuclear whodunit mystery
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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.
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First-forbidden transitions in the reactor anomaly
Shell-model shape factors for 36 first-forbidden beta decays shift predicted reactor antineutrino spectra by 4-5% in the 4-7 MeV range, making forbidden transitions a necessary ingredient in reactor anomaly analyses.