Description
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 $0.094$) \times 10^{-43}$cm$^2$/fission, corresponding to 0.941 $\pm$ 0.015 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. In this presentation, we will make discussion on the 6 MeV excess associated with the reactor fuel burning.
| Collaboration | RENO |
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