PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Parallel: Neutrino Physics
The measurement of absolute reactor neutrino flux and spectrum, and their evolution at Daya Bay
B.Z. Hu* on behalf of the Daya Bay collaboration
*corresponding author
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Published on: August 02, 2019
The Daya Bay Reactor Neutrino Experiment consists of eight functionally identical detectors placed underground at different baselines from six 2.9 $\mathrm{GW}_{th}$ 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 fuel-dependent evolution. The comparison between measured spectrum and predictions from Huber-Mueller model revealed a 2.9 $\sigma$ 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 $\sigma$ discrepancy in the antineutrino flux variation with respect to the reactor fuel composition. The discrepancy suggests an overestimation of the predicted contribution from the $\mathrm{^{235}U}$ fission isotope and indicates that this isotope could be primary contributor to the reactor antineutrino anomaly.
DOI: https://doi.org/10.22323/1.340.0117
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