PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Neutrino Physics
Reactor Antineutrino Flux and Spectrum Measurement at Daya Bay
F. An
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Abstract
The Daya Bay Reactor Neutrino Experiment uses an array of eight underground detectors to study antineutrinos from six reactor cores at different baselines. Four antineutrino detectors in the two near experimental halls are used for the measurements. In the latest analysis, the reactor antineutrino flux measurement is improved by reducing the systematic uncertainty of neutron detection efficiency. A new measurement of the prompt energy spectrum of reactor antineutrinos with 1958 days of data shows a significant discrepancy in the shape of the spectrum compared with the Huber-Mueller model prediction. The individual IBD yield and spectra of $^{235}$U and $^{239}$Pu are also extracted for the first time from the time evolution of IBD prompt energy spectra as the reactor fuel composition changes.
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