Improved measurement of the reactor antineutrino flux at Daya Bay

作者：D. Adey, Fengpeng An, A. B. Balantekin, H. R. Band, M. Bishai, S. Blyth, D. Cao, G. F. Cao, Jun Cao, Y. L. Chan, J. F. Chang, Y. Chang, H.S. Chen, S. M. Chen, Y. Chen, Y. X. Chen, Jie Cheng, Zhaokan Cheng, J. J. Cherwinka, M. C. Chu, A. Chukanov, J. P. Cummings, F. S. Deng, Ying Ding, M. Diwan, M. Dolgareva, J. Dove, D. A. Dwyer, W. R. Edwards, M. Gonchar, G. H. Gong, Haipeng Gong, W. Gu, Lei Guo, X. H. Guo, Yuhang Guo, Ziwei Guo, R. Hackenburg, S. Hans, M. He, K. M. Heeger, Y. K. Heng, A. Higuera, Y. Hsiung, Beibei Hu, T. Hu, Z. Hu, H. X. Huang, X. T. Huang, Y. B. Huang, Patrick Huber, W. Huo, Ghulam Hussain, D. E. Jaffe, K. L. Jen, X. L. Ji, Xingzhao Ji, R. A. Johnson, D. Jones, Li-Wei Kang, S. H. Kettell, L. W. Koerner, S. Kohn, M. Krämer, T. J. Langford, L. Lebanowski, J. Lee, J. H. C. Lee, R. T. Lei, R. Leitner, J. K. C. Leung, C. Li, F. Li, H. L. Li, Q. J. Li, S. Li, S. Li, S. J. Li, W. D. Li, X. N. Li, X. Q. Li, Yufeng Li, Z. B. Li, Han Liang, C.-J. Lin, Guey-Lin Lin, S. Lin, S. K. Lin, Y. C. Lin, J. J. Ling, J. M. Link, L. Littenberg, B. R. Littlejohn, J. C. Liu, J. L. Liu, Y. Liu, Y. H. Liu, C. W. Loh, Cai-Dian Lü, H. Q. Lu, J. S. Lu, K. B. Luk, X. B., X. Y., Y. Q., Yury Malyshkin, C. Marshall, D. A. Martínez Caicedo, Kirk T. McDonald, R. D. McKeown, I. V. Mitchell, L. Mora Lepin, J. Napolitano, D. Naumov, E. Naumova, J. P. Ochoa‐Ricoux, A. Olshevskiy, H.-R. Pan, J. Park, S. Patton, V. Pec, J. C. Peng, L. Pinsky, C. S. J. Pun, F. Z. Qi, M. Qi, X. Qian, Rui Qiu, N. Raper, Jie Ren, R. Rosero, B. Roskovec, X. C. Ruan, H. Steiner, J. L. Sun, Konstantin Treskov, W.-H. Tse, C. E. Tull, B. Viren, V. Vorobel, C. H. Wang, Jun Wang, M. Wang, N. Y. Wang, R. G. Wang, W. Wang, W. Wang, Xiang-Gao Wang, Y. F. Wang, Zheng Wang, Zhimin Wang, Zhe Wang, H. Wei, L. H. Wei, Liangjian Wen, K. Whisnant, C. G. White, T. Wise, H. L. H. Wong, S. C. F. Wong, E. Worcester, Qian Wu, W. Wu, D. M. Xia, Z. Z. Xing, Jinliang Xu, T. Xue, C. G. Yang, Heng Yang, L. Yang, M. Yang, M. T. Yang, Y. Z. Yang, M. Ye, M. Yeh, B. L. Young, H. Z. Yu, Zeyuan Yu, B. B. Yue, S. Zeng, Liang Zhan, C. Zhang, C. C. Zhang, Feifan Zhang, H. H. Zhang, J. W. Zhang, Qingmin Zhang, R. Zhang, X. F. Zhang, X. T. Zhang, Y. M. Zhang, Y. M. Zhang, Y. X. Zhang, Y. Y. Zhang, Z. J. Zhang, Zongzhen Zhang, Z. Y. Zhang, J. Y. Zhao, Peng Zheng, L. Zhou, H. L. Zhuang, J. H. Zou · 发表于：Physical review. D/Physical review. D. · 年份：2019 · DOI：10.1103/physrevd.100.052004 · 被引用次数：45 · 研究领域：Neutrino Physics Research、Particle physics theoretical and experimental studies、Radiation Detection and Scintillator Technologies

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 $(5.91\ifmmode\pm\else\textpm\fi{}0.09)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}43}\text{ }\text{ }{\mathrm{cm}}^{2}/\text{fission}$ with total uncertainty improved by 29%. The corresponding mean fission fractions from the four main fission isotopes $^{235}\mathrm{U}$, $^{238}\mathrm{U}$, $^{239}\mathrm{Pu}$, and $^{241}\mathrm{Pu}$ are 0.564, 0.076, 0.304, and 0.056, respectively. The ratio of measured to predicted antineutrino yield is found to be $0.952\ifmmode\pm\else\textpm\fi{}0.014\ifmmode\pm\else\textpm\fi{}0.023$ ($1.001\ifmmode\pm\else\textpm\fi{}0.015\ifmmode\pm\else\textpm\fi{}0.027$) 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.