期刊
PHYSICAL REVIEW D
卷 100, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.100.052004
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
- Research Grants Council of the Hong Kong Special Administrative Region of China
- Ministry of Education in Taiwan
- U.S. National Science Foundation
- Ministry of Education, Youth, and Sports of the Czech Republic
- Charles University Research Centre UNCE
- Joint Institute of Nuclear Research in Dubna, Russia
- NSFC-RFBR joint research program
- National Commission of Scientific and Technological Research of Chile
This work reports a precise measurement of the reactor antineutrino flux using 2.2 million inverse beta decay (IBD) events collected with the Daya Bay near detectors in 1230 days. The dominant uncertainty on the neutron detection efficiency is reduced by 56% with respect to the previous measurement through a comprehensive neutron calibration and detailed data and simulation analysis. The new average IBD yield is determined to be (5.91 +/- 0.09) x 10(-43) cm(2)/fission with total uncertainty improved by 29%. The corresponding mean fission fractions from the four main fission isotopes U-235, U-238, Pu-239, and( 241)Pu are 0.564, 0.076, 0.304, and 0.056, respectively. The ratio of measured to predicted antineutrino yield is found to be 0.952 +/- 0.014 +/- 0.023 (1.001 +/- 0.015 +/- 0.027) for the Huber-Mueller (ILL-Vogel) model, where the first and second uncertainty are experimental and theoretical model uncertainty, respectively. This measurement confirms the discrepancy between the world average of reactor antineutrino flux and the Huber-Mueller model.
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