期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.241805
关键词
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资金
- Ministry of Science and Technology of China
- U.S. Department of Energy
- Chinese Academy of Sciences
- CAS Center for Excellence in Particle Physics
- National Natural Science Foundation of China
- Guangdong provincial government
- Shenzhen municipal government
- China General Nuclear Power Group
- Key Laboratory of Particle and Radiation Imaging (Tsinghua University)
- Shanghai Laboratory for Particle Physics and Cosmology
- Research Grants Council of the Hong Kong Special Administrative Region of China
- University Development Fund of The University of Hong Kong
- MOE program for Research of Excellence at National Taiwan University
- U.S. National Science Foundation
- Alfred P. Sloan Foundation
- Ministry of Education, Youth, and Sports of the Czech Republic
- Charles University Research Centre UNCE
- CNFC-RFBR joint research program
- Tsinghua University Initiative Scientific Research Program
- Key Laboratory of Particle Physics and Particle Irradiation (Shandong University)
- National Chiao-Tung University
- NSC fund support from Taiwan
- Joint Institute of Nuclear Research in Dubna, Russia
- National Commission of Scientific and Technological Research of Chile
- Ministry of Education
We report a measurement of electron antineutrino oscillation from the Daya Bay Reactor Neutrino Experiment with nearly 4 million reactor (nu) over bar (e) inverse beta 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 Li-9 and He-8 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 (nu) over bar (e) rates and energy spectra among detectors yields sin(2)2 theta(13) = 0.0856 +/- 0.0029 and Delta m(32)(2) = (2.471(-0.070)(+0.068)) x 10(-3) eV(2) assuming the normal hierarchy, and Delta m(32)(2) = -(2.575(-0.070)(+0.068)) x 10(-3) eV(2) assuming the inverted hierarchy.
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