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Published December 14, 2018 | Published + Supplemental Material + Submitted
Journal Article Open

Measurement of the Electron Antineutrino Oscillation with 1958 Days of Operation at Daya Bay


We report a measurement of electron antineutrino oscillation from the Daya Bay Reactor Neutrino Experiment with nearly 4 million reactor ν_e inverse β decay candidates observed over 1958 days of data collection. The installation of a flash analog-to-digital converter readout system and a special calibration campaign using different source enclosures reduce uncertainties in the absolute energy calibration to less than 0.5% for visible energies larger than 2 MeV. The uncertainty in the cosmogenic ^9Li and ^8He background is reduced from 45% to 30% in the near detectors. A detailed investigation of the spent nuclear fuel history improves its uncertainty from 100% to 30%. Analysis of the relative ν_e rates and energy spectra among detectors yields sin^22θ_(13) = 0.0856±0.0029 and Δm^2_(32)=(2.471^(+0.068)_(−0.070))×10^(-3)  eV^2 assuming the normal hierarchy, and Δm^2_(32) = −(2.575^(+0.068)_(−0.070))×10^(-3)  eV2 assuming the inverted hierarchy.

Additional Information

© 2018 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3. Received 11 September 2018; published 14 December 2018. Daya Bay is supported in part by the Ministry of Science and Technology of China, the U.S. Department of Energy, the Chinese Academy of Sciences, the CAS Center for Excellence in Particle Physics, the National Natural Science Foundation of China, the Guangdong provincial government, the Shenzhen municipal government, the China General Nuclear Power Group, Key Laboratory of Particle and Radiation Imaging (Tsinghua University), the Ministry of Education, Key Laboratory of Particle Physics and Particle Irradiation (Shandong University), the Ministry of Education, Shanghai Laboratory for Particle Physics and Cosmology, the Research Grants Council of the Hong Kong Special Administrative Region of China, the University Development Fund of The University of Hong Kong, the MOE program for Research of Excellence at National Taiwan University, National Chiao-Tung University, and NSC fund support from Taiwan, the U.S. National Science Foundation, the Alfred P. Sloan Foundation, the Ministry of Education, Youth, and Sports of the Czech Republic, the Charles University Research Centre UNCE, the Joint Institute of Nuclear Research in Dubna, Russia, the CNFC-RFBR joint research program, the National Commission of Scientific and Technological Research of Chile, and the Tsinghua University Initiative Scientific Research Program. We acknowledge Yellow River Engineering Consulting Co., Ltd., and China Railway 15th Bureau Group Co., Ltd., for building the underground lab.

Attached Files

Submitted - 1809.02261.pdf

Supplemental Material - DayaBay_BackgroundSpectrum_EH1_1958days.txt

Supplemental Material - DayaBay_BackgroundSpectrum_EH2_1958days.txt

Supplemental Material - DayaBay_BackgroundSpectrum_EH3_1958days.txt

Supplemental Material - DayaBay_DeltaChiSq_1958days.txt

Supplemental Material - DayaBay_DetectorModel_Edep_to_avgErec.txt

Supplemental Material - DayaBay_DetectorModel_Etrue_to_Edep.txt

Supplemental Material - DayaBay_DetectorModel_Etrue_to_Erec.txt

Supplemental Material - DayaBay_IBDPromptSpectrum_EH1_1958days.txt

Supplemental Material - DayaBay_IBDPromptSpectrum_EH2_1958days.txt

Supplemental Material - DayaBay_IBDPromptSpectrum_EH3_1958days.txt

Published - PhysRevLett.121.241805.pdf


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Additional details

August 19, 2023
August 19, 2023