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Advances in High Energy Physics
Volume 2015 (2015), Article ID 364392, 12 pages
Review Article

The Antineutrino Energy Structure in Reactor Experiments

Instituto de Física Corpuscular (IFIC), CSIC and Universitat de València, C/Catedrático José Beltran 2, 46980 Paterna, Spain

Received 26 July 2015; Revised 5 November 2015; Accepted 10 December 2015

Academic Editor: Seon-Hee Seo

Copyright © 2015 Pau Novella. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.


The recent observation of an energy structure in the reactor antineutrino spectrum is reviewed. The reactor experiments Daya Bay, Double Chooz, and RENO have reported a consistent excess of antineutrinos deviating from the flux predictions, with a local significance of about 4 between 4 and 6 MeV of the positron energy spectrum. The possible causes of the structure are analyzed in this work, along with the different experimental approaches developed to identify its origin. Considering the available data and results from the three experiments, the most likely explanation concerns the reactor flux predictions and the associated uncertainties. Therefore, the different current models are described and compared. The possible sources of incompleteness or inaccuracy of such models are discussed, as well as the experimental data required to improve their precision.