Measurement of reactor antineutrino flux and spectrum at RENO

The RENO experiment reports measured flux and energy spectrum of reactor electron antineutrinos ?¯e from the six reactors at Hanbit Nuclear Power Plant. measurements use 966 094 116 111?¯e candidate events with a background fraction 2.39% (5.13%), acquired in near (far) detector, August 2011 to March 2020. inverse beta decay (IBD) yield is as (5.852±0.094)×10?43 cm2/fission, corresponding 0.941±0.015 prediction by Huber Mueller (HM) model. A obtained unfolding IBD prompt spectrum. neutrino shows clear excess around 6 MeV relative HM prediction. will be useful for understanding unknown properties models. observed discrepancies suggest next round precision modification current models.Received 29 October 2020Revised 21 January 2021Accepted 2 November 2021DOI:https://doi.org/10.1103/PhysRevD.104.L111301Published American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution this work must maintain attribution author(s) published article’s title, journal citation, DOI. Funded SCOAP3.Published SocietyPhysics Subject Headings (PhySH)Research AreasNeutrino interactionsNeutrino oscillationsTechniquesNeutrino detectorsParticles & FieldsNuclear Physics