Diagnosing the reactor antineutrino anomaly with global antineutrino flux data

Giunti, C. (INFN, Sezione di Torino, Via P. Giuria 1, I10125 Torino, Italy) ; Li, Y. F. (Institute of High Energy Physics, Chinese Academy of Sciences, and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China) ; Littlejohn, B. R. (Physics Department, Illinois Institute of Technology, Chicago, Illinois 60616, USA) ; Surukuchi, P. T. (Physics Department, Illinois Institute of Technology, Chicago, Illinois 60616, USA)

15 April 2019

Abstract: We have examined the impact of new Daya Bay, Double Chooz, and RENO measurements on global fits of reactor antineutrino flux data to a variety of hypotheses regarding the origin of the reactor antineutrino anomaly. In comparing RENO and Daya Bay measurements of inverse beta decay (IBD) yield versus Pu239 fission fraction, we find differing levels of precision in measurements of time-integrated yield and yield slope, but similar central values, leading to modestly enhanced isotopic IBD yield measurements in a joint fit of the two datasets. In the absence of sterile neutrino oscillations, global fits to all measurements now provide 3σ preference for incorrect modeling of specific fission isotopes over common mismodeling of all beta-converted isotopes. If sterile neutrino oscillations are considered, global IBD yield fits provide no substantial preference between oscillation-including and oscillation-excluding hypotheses: hybrid models containing both sterile neutrino oscillations and incorrect U235 or Pu239 flux predictions are favored at only 1σ2σ with respect to models where U235, U238, and Pu239 are assumed to be incorrectly predicted.

Published in: Physical Review D 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevD.99.073005
License: CC-BY-4.0

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