Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.111801
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Funding
- 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
- National Commission of Scientific and Technological Research of Chile
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This Letter reports the first extraction of individual antineutrino spectra from U-235 and Pu-239 fission and an improved measurement of the prompt energy spectrum of reactor antineutrinos at Daya Bay. The analysis uses 3.5 x 10(6) inverse beta-decay candidates in four near antineutrino detectors in 1958 days. The individual antineutrino spectra of the two dominant isotopes, U-235 and Pu-239, are extracted using the evolution of the prompt spectrum as a function of the isotope fission fractions. In the energy window of 4-6 MeV, a 7% (9%) excess of events is observed for the U-235 (Pu-239) spectrum compared with the normalized Huber-Mueller model prediction. The significance of discrepancy is 4.0 sigma for U-235 spectral shape compared with the Huber-Mueller model prediction. The shape of the measured inverse beta-decay prompt energy spectrum disagrees with the prediction of the Huber-Mueller model at 5.3 sigma. In the energy range of 4-6 MeV, a maximal local discrepancy of 6.3 sigma is observed.
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