Improved Measurement of the Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay

An, F. P.; Bai, W. D.; Balantekin, A. B.; Bishai, M.; Blyth, S.; Cao, G. F.; Cao, J.; Chang, J. F.; Chang, Y.; Chen, H. S.; Chen, H. Y.; Chen, S. M.; Chen, Y.; Chen, Y. X.; Cheng, J.; Cheng, J.; Cheng, Y. -C.; Cheng, Z. K.; Cherwinka, J. J.; Chu, M. C.; Cummings, J. P.; Dalager, O.; Deng, F. S.; Ding, Y. Y.; Diwan, M. V.; Dohnal, T.; Dolzhikov, D.; Dove, J.; Dugas, K. V.; Duyang, H. Y.; Dwyer, D. A.; Gallo, J. P.; Gonchar, M.; Gong, G. H.; Gong, H.; Gu, W. Q.; Guo, J. Y.; Guo, L.; Guo, X. H.; Guo, Y. H.; Guo, Z.; Hackenburg, R. W.; Han, Y.; Hans, S.; He, M.; Heeger, K. M.; Heng, Y. K.; Hor, Y. K.; Hsiung, Y. B.; Hu, B. Z.; Hu, J. R.; Hu, T.; Hu, Z. J.; Huang, H. X.; Huang, J. H.; Huang, X. T.; Huang, Y. B.; Huber, P.; Jaffe, D. E.; Jen, K. L.; Ji, X. L.; Ji, X. P.; Johnson, R. A.; Jones, D.; Kang, L.; Kettell, S. H.; Kohn, S.; Kramer, M.; Langford, T. J.; Lee, J.; Lee, J. H. C.; Lei, R. T.; Leitner, R.; Leung, J. K. C.; Li, F.; Li, H. L.; Li, J. J.; Li, Q. J.; Li, R. H.; Li, S.; Li, S. C.; Li, W. D.; Li, X. N.; Li, X. Q.; Li, Y. F.; Li, Z. B.; Liang, H.; Lin, C. J.; Lin, G. L.; Lin, S.; Ling, J. J.; Link, J. M.; Littenberg, L.; Littlejohn, B. R.; Liu, J. C.; Liu, J. L.; Liu, J. X.; Lu, C.; Lu, H. Q.; Luk, K. B.; Ma, B. Z.; Ma, X. B.; Ma, X. Y.; Ma, Y. Q.; Mandujano, R. C.; Marshall, C.; McDonald, K. T.; McKeown, R. D.; Meng, Y.; Napolitano, J.; Naumov, D.; Naumova, E.; Nguyen, T. M. T.; Ochoa-Ricoux, J. P.; Olshevskiy, A.; Park, J.; Patton, S.; Peng, J. C.; Pun, C. S. J.; Qi, F. Z.; Qi, M.; Qian, X.; Raper, N.; Ren, J.; Morales Reveco, C.; Rosero, R.; Roskovec, B.; Ruan, X. C.; Russell, B.; Steiner, H.; Sun, J. L.; Tmej, T.; Treskov, K.; Tse, W. -H.; Tull, C. E.; Tung, Y. C.; Viren, B.; Vorobel, V.; Wang, C. H.; Wang, J.; Wang, M.; Wang, N. Y.; Wang, R. G.; Wang, W.; Wang, X.; Wang, Y.; Wang, Y. F.; Wang, Z.; Wang, Z.; Wang, Z. M.; Wei, H. Y.; Wei, L. H.; Wen, L. J.; Whisnant, K.; White, C. G.; Wong, H. L. H.; Worcester, E.; Wu, D. R.; Wu, Q.; Wu, W. J.; Xia, D. M.; Xie, Z. Q.; Xing, Z. Z.; Xu, H. K.; Xu, J. L.; Xu, T.; Xue, T.; Yang, C. G.; Yang, L.; Yang, Y. Z.; Yao, H. F.; Ye, M.; Yeh, M.; Young, B. L.; Yu, H. Z.; Yu, Z. Y.; Yue, B. B.; Zavadskyi, V.; Zeng, S.; Zeng, Y.; Zhan, L.; Zhang, C.; Zhang, F. Y.; Zhang, H. H.; Zhang, J. L.; Zhang, J. W.; Zhang, Q. M.; Zhang, S. Q.; Zhang, X. T.; Zhang, Y. M.; Zhang, Y. X.; Zhang, Y. Y.; Zhang, Z. J.; Zhang, Z. P.; Zhang, Z. Y.; Zhao, J.; Zhao, R. Z.; Zhou, L.; Zhuang, H. L.; Zou, J. H.

doi:10.1103/PhysRevLett.130.211801

Title: Improved Measurement of the Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay

Journal Article · Mon May 22 00:00:00 EDT 2023 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.130.211801· OSTI ID:1974648

An, F. P.; Bai, W. D.; Balantekin, A. B.; Bishai, M.; Blyth, S.; Cao, G. F.; Cao, J.; Chang, J. F.; Chang, Y.; Chen, H. S.; Chen, H. Y.; Chen, S. M.; Chen, Y.; Chen, Y. X.; Cheng, J.; Cheng, J.; Cheng, Y. -C.; Cheng, Z. K.; Cherwinka, J. J.; Chu, M. C. more »

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 ²³⁹Pu 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 ²³⁹Pu 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 ²³⁵U fission is changed or the predicted ²³⁵U, ²³⁸U, ²³⁹Pu, and ²⁴¹Pu spectra are changed in equal measure.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)

Contributing Organization:: Daya Bay Collaboration

Grant/Contract Number:: SC0012704; SC0020235

OSTI ID:: 1974648

Alternate ID(s):: OSTI ID: 1975238; OSTI ID: 1991306

Report Number(s):: BNL-224443-2023-JAAM; PRLTAO; 211801

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 130 Journal Issue: 21; ISSN 0031-9007

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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