Measurement of Reactor Antineutrino Flux and Spectrum at RENO

Abstract

The RENO experiment reports measured flux and energy spectrum of reactor electron antineutrinos\,(${\overline{\nu }}_e$) from the six reactors at Hanbit Nuclear Power Plant. The measurements use 966\,094\,(116\,111)\,${\overline{\nu }}_e$ candidate events with a background fraction of 2.39\%\,(5.13\%), acquired in the near\,(far) detector, from August 2011 to March 2020. The inverse beta decay (IBD) yield is measured as (5.852$\pm$0.124$)\times 10^{-43}$\,cm${}^2$/fission, corresponding to 0.941\,$\pm$ 0.019 of the prediction by the Huber and Mueller (HM) model. A reactor ${\overline{\nu }}_e$ spectrum is obtained by unfolding a measured IBD prompt spectrum. The obtained neutrino spectrum shows a clear excess around 6\,MeV relative to the HM prediction. The obtained reactor ${\overline{\nu }}_e$ spectrum will be useful for understanding unknown neutrino properties and reactor models. The observed discrepancies suggest the next round of precision measurements and modification of the current reactor ${\overline{\nu }}_e$ models.

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