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First Measurement of High-Energy Reactor Antineutrinos at Daya Bay

An, F. P. and Bai, W. D. and Balantekin, A. B. and Bishai, M. and Blyth, S. and Cao, G. F. and Cao, J. and Chang, J. F. and Chang, Y. and Chen, H. S. and Chen, H. Y. and Chen, S. M. and Chen, Y. and Chen, Y. X. and Cheng, J. and Cheng, Z. K. and Cherwinka, J. J. and Chu, M. C. and Cummings, J. P. and Dalager, O. and Deng, F. S. and Ding, Y. Y. and Diwan, M. V. and Dohnal, T. and Dolzhikov, D. and Dove, J. and Dwyer, D. A. and Gallo, J. P. and Gonchar, M. and Gong, G. H. and Gong, H. and Gu, W. Q. and Guo, J. Y. and Guo, L. and Guo, X. H. and Guo, Y. H. and Guo, Z. and Hackenburg, R. W. and Hans, S. and He, M. and Heeger, K. M. and Heng, Y. K. and Hor, Y. K. and Hsiung, Y. B. and Hu, B. Z. and Hu, J. R. and Hu, T. and Hu, Z. J. and Huang, H. X. and Huang, J. H. and Huang, X. T. and Huang, Y. B. and Huber, P. and Jaffe, D. E. and Jen, K. L. and Ji, X. L. and Ji, X. P. and Johnson, R. A. and Jones, D. and Kang, L. and Kettell, S. H. and Kohn, S. and Kramer, M. and Langford, T. J. and Lee, J. and Lee, J. H. C. and Lei, R. T. and Leitner, R. and Leung, J. K. C. and Li, F. and Li, H. L. and Li, J. J. and Li, Q. J. and Li, R. H. and Li, S. and Li, S. C. and Li, W. D. and Li, X. N. and Li, X. Q. and Li, Y. F. and Li, Z. B. and Liang, H. and Lin, C. J. and Lin, G. L. and Lin, S. and Ling, J. J. and Link, J. M. and Littenberg, L. and Littlejohn, B. R. and Liu, J. C. and Liu, J. L. and Liu, J. X. and Lu, C. and Lu, H. Q. and Luk, K. B. and Ma, B. Z. and Ma, X. B. and Ma, X. Y. and Ma, Y. Q. and Mandujano, R. C. and Marshall, C. and McDonald, K. T. and McKeown, R. D. and Meng, Y. and Napolitano, J. and Naumov, D. and Naumova, E. and Nguyen, T. M. T. and Ochoa-Ricoux, J. P. and Olshevskiy, A. and Pan, H.-R. and Park, J. and Patton, S. and Peng, J. C. and Pun, C. S. J. and Qi, F. Z. and Qi, M. and Qian, X. and Raper, N. and Ren, J. and Morales Reveco, C. and Rosero, R. and Roskovec, B. and Ruan, X. C. and Steiner, H. and Sun, J. L. and Tmej, T. and Treskov, K. and Tse, W.-H. and Tull, C. E. and Viren, B. and Vorobel, V. and Wang, C. H. and Wang, J. and Wang, M. and Wang, N. Y. and Wang, R. G. and Wang, W. and Wang, X. and Wang, Y. and Wang, Y. F. and Wang, Z. and Wang, Z. and Wang, Z. M. and Wei, H. Y. and Wei, L. H. and Wen, L. J. and Whisnant, K. and White, C. G. and Wong, H. L. H. and Worcester, E. and Wu, D. R. and Wu, Q. and Wu, W. J. and Xia, D. M. and Xie, Z. Q. and Xing, Z. Z. and Xu, H. K. and Xu, J. L. and Xu, T. and Xue, T. and Yang, C. G. and Yang, L. and Yang, Y. Z. and Yao, H. F. and Ye, M. and Yeh, M. and Young, B. L. and Yu, H. Z. and Yu, Z. Y. and Yue, B. B. and Zavadskyi, V. and Zeng, S. and Zeng, Y. and Zhan, L. and Zhang, C. and Zhang, F. Y. and Zhang, H. H. and Zhang, J. L. and Zhang, J. W. and Zhang, Q. M. and Zhang, S. Q. and Zhang, X. T. and Zhang, Y. M. and Zhang, Y. X. and Zhang, Y. Y. and Zhang, Z. J. and Zhang, Z. P. and Zhang, Z. Y. and Zhao, J. and Zhao, R. Z. and Zhou, L. and Zhuang, H. L. and Zou, J. H. (2022) First Measurement of High-Energy Reactor Antineutrinos at Daya Bay. Physical Review Letters, 129 (4). Art. No. 041801. ISSN 0031-9007. doi:10.1103/physrevlett.129.041801.

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[img] Plain Text (unfolded antineutrino energy spectrum of IBD reaction above 7 MeV at Daya Bay (AntineutrinoEnergySpectrum.txt)) - Supplemental Material
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[img] Plain Text (total measurement of the prompt energy spectrum of IBD reaction above 6 MeV (PromptEnergySpectrum.txt)) - Supplemental Material
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[img] Plain Text (response matrix of the Daya Bay detector (ResponseMatrix.txt)) - Supplemental Material
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[img] Plain Text (unfolded antineutrino energy spectrum from 1.8 to 11 MeV at Daya Bay (WholeAntineutrinoEnergySpectrum.txt)) - Supplemental Material
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This Letter reports the first measurement of high-energy reactor antineutrinos at Daya Bay, with nearly 9000 inverse beta decay candidates in the prompt energy region of 8–12 MeV observed over 1958 days of data collection. A multivariate analysis is used to separate 2500 signal events from background statistically. The hypothesis of no reactor antineutrinos with neutrino energy above 10 MeV is rejected with a significance of 6.2 standard deviations. A 29% antineutrino flux deficit in the prompt energy region of 8–11 MeV is observed compared to a recent model prediction. We provide the unfolded antineutrino spectrum above 7 MeV as a data-based reference for other experiments. This result provides the first direct observation of the production of antineutrinos from several high-Q_β isotopes in commercial reactors.

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Hu, J. R.0000-0003-2149-9691
Yu, Z. Y.0000-0002-6462-8417
Additional Information: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 17 March 2022; revised 5 June 2022; accepted 28 June 2022; published 18 July 2022) We thank Magali Estienne and Muriel Fallot for their generosity to extend their summation model in Ref. [20] above 10 MeV and their helpful discussions. The Daya Bay experiment 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, the Research Grants Council of the Hong Kong Special Administrative Region of China, the Ministry of Education in Taiwan, the U.S. National Science 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, and the National Commission of Scientific and Technological Research of Chile. 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 Guangdong Nuclear Power Group and China Light and Power Company.
Funding AgencyGrant Number
Ministry of Science and Technology (China)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Chinese Academy of SciencesUNSPECIFIED
CAS Center for Excellence in Particle PhysicsUNSPECIFIED
National Natural Science Foundation of ChinaUNSPECIFIED
Government of Guangdong ProvinceUNSPECIFIED
Science, Technology and Innovation Commission of Shenzhen MunicipalityUNSPECIFIED
China General Nuclear Power GroupUNSPECIFIED
Research Grants Council of Hong KongUNSPECIFIED
Ministry of Education (Taipei)UNSPECIFIED
Ministry of Education, Youth and Sports (Czech Republic)UNSPECIFIED
Charles UniversityUNSPECIFIED
Joint Institute of Nuclear Research (Dubna)UNSPECIFIED
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)UNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20220725-156797000
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115830
Deposited By: George Porter
Deposited On:27 Jul 2022 16:58
Last Modified:27 Jul 2022 16:58

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