@article{d38fc9b658e84523b477abed08e585ac,
title = "Improved Measurement of the Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay",
abstract = "Reactor neutrino experiments play a crucial role in advancing our knowledge of neutrinos. In this Letter, the evolution of the flux and spectrum as a function of the reactor isotopic content is reported in terms of the inverse-beta-decay yield at Daya Bay with 1958 days of data and improved systematic uncertainties. These measurements are compared with two signature model predictions: the Huber-Mueller model based on the conversion method and the SM2018 model based on the summation method. The measured average flux and spectrum, as well as the flux evolution with the Pu239 isotopic fraction, are inconsistent with the predictions of the Huber-Mueller model. In contrast, the SM2018 model is shown to agree with the average flux and its evolution but fails to describe the energy spectrum. Altering the predicted inverse-beta-decay spectrum from Pu239 fission does not improve the agreement with the measurement for either model. The models can be brought into better agreement with the measurements if either the predicted spectrum due to U235 fission is changed or the predicted U235, U238, Pu239, and Pu241 spectra are changed in equal measure.",
author = "\{Daya Bay Collaboration\} and An, \{F. P.\} and Bai, \{W. D.\} and Balantekin, \{A. B.\} and M. Bishai and S. Blyth and Cao, \{G. F.\} and J. Cao and Chang, \{J. F.\} and Y. Chang and Chen, \{H. S.\} and Chen, \{H. Y.\} and Chen, \{S. M.\} and Y. Chen and Chen, \{Y. X.\} and J. Cheng and J. Cheng and Cheng, \{Y. C.\} and Cheng, \{Z. K.\} and Cherwinka, \{J. J.\} and Chu, \{M. C.\} and Cummings, \{J. P.\} and O. Dalager and Deng, \{F. S.\} and Ding, \{Y. Y.\} and Diwan, \{M. V.\} and T. Dohnal and D. Dolzhikov and J. Dove and Dugas, \{K. V.\} and Duyang, \{H. Y.\} and Dwyer, \{D. A.\} and Gallo, \{J. P.\} and M. Gonchar and Gong, \{G. H.\} and H. Gong and Gu, \{W. Q.\} and Guo, \{J. Y.\} and L. Guo and Guo, \{X. H.\} and Guo, \{Y. H.\} and Z. Guo and Hackenburg, \{R. W.\} and Y. Han and S. Hans and M. He and Heeger, \{K. M.\} and Heng, \{Y. K.\} and Hor, \{Y. K.\} and Hsiung, \{Y. B.\} and Peng, \{J. C.\}",
note = "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 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 Charles University Research Center in the Czech Republic, 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 laboratory. We are grateful for the ongoing cooperation from the China General Nuclear Power Group and China Light and Power Company.",
year = "2023",
month = may,
day = "26",
doi = "10.1103/PhysRevLett.130.211801",
language = "English (US)",
volume = "130",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "21",
}