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First Measurement of High-Energy Reactor Antineutrinos at Daya Bay
Daya Bay Collaboration
Daya Bay Collaboration
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Journal article
Date
2022-07-18
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Physics
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http://dx.doi.org/10.1103/physrevlett.129.041801
Abstract
This Letter reports the first measurement of high-energy reactor antineutrinos at Daya Bay, with nearly 9000 inverse beta decay candidates in the prompt energy region of 8–12 MeV observed over 1958 days of data collection. A multivariate analysis is used to separate 2500 signal events from background statistically. The hypothesis of no reactor antineutrinos with neutrino energy above 10 MeV is rejected with a significance of 6.2 standard deviations. A 29% antineutrino flux deficit in the prompt energy region of 8–11 MeV is observed compared to a recent model prediction. We provide the unfolded antineutrino spectrum above 7 MeV as a data-based reference for other experiments. This result provides the first direct observation of the production of antineutrinos from several high-Qβ isotopes in commercial reactors.
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Physical Review Letters, Vol. 129, Iss. 4
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