title: NEOS Data and the Origin of the 5 MeV Bump in the Reactor Antineutrino Spectrum.
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 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 caveats, this should also allow us to improve the sensitivity for sterile neutrino searches in NEOS.
authors.affiliation: Center of Neutrino Physics, Virginia Tech, Blacksburg, Virgina 24061, USA.
authors.forename: Patrick
authors.initials: P
authors.lastname: Huber