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The Daya Bay Reactor Neutrino Experiment consists of eight functionally identical detectors placed underground at different baselines from six 2.9 GWth reactor cores. Since Dec. 2011, the experiment has collected more than 2.2 million inverse beta decay (IBD) candidates, enabling a precision measurement of the absolute reactor antineutrino flux and spectrum, and their fueldependent evolution. The comparison between measured spectrum and predictions from HuberMueller model revealed a 2.9 σ deviation for the whole energy region and mostly pronounced in the region around 4-6 MeV. The measurement of the evolution of the reactor antineutrino flux and spectrum showed a 2.8 σ discrepancy in the antineutrino flux variation with respect to the reactor fuel composition. The discrepancy suggests an overestimation of the predicted contribution from the 235U fission isotope and indicates that this isotope could be primary contributor to the reactor antineutrino anomaly.

The measurement of absolute reactor neutrino flux and spectrum, and their evolution at Daya Bay