The 24th International Workshop on Neutrinos From Accelerators (NuFact 2023)

Measurement of Reactor Antineutrino Spectra from 235U and 239Pu Fission at RENO

Not scheduled

20m

Natural Science Lecture Center (building-28), Seoul National University, Korea

Poster WG1: Neutrino Oscillation Physics

Speaker

Dojin Kim

Description

The RENO experiment reports the separated reactor antineutrino spectra of 235U and 239Pu from the data sets of 2500 days of near data. As the fission fractions changes as the fuel cycle evolve, the contribution from different fissile isotopes to the measured spectrum can be identified. The separated prompt spectra are unfolded to antielectron neutrino spectra where the detector effect is nearly removed. The IBD yield of 235U(239Pu) is measured as 6.17 ± 0.02(4.19 ± 0.24) cm2/fission. The separated spectra of 235U show clear excess in 5 MeV (6 MeV) of prompt (neutrino) energy region with the 3.9σ of significance, while excess in 239Pu is milder than 235U and consistent with the Huber model with 1.1σ significance.