Improved Measurement of the Reactor Antineutrino Flux at Daya Bay

Daya Bay Collaboration,D. Adey,F. P. An,A. B. Balantekin,H. R. Band,M. Bishai, S. Blyth, D. Cao,G. F. Cao,J. Cao,Y. L. Chan,J. F. Chang,Y. Chang,H. S. Chen,S. M. Chen,Y. Chen,Y. X. Chen,J. Cheng,Z. K. Cheng,J. J. Cherwinka,M. C. Chu,A. Chukanov,J. P. Cummings, F. S. Deng, Y. Y. Ding,M. V. Diwan,M. Dolgareva,J. Dove,D. A. Dwyer,W. R. Edwards,M. Gonchar,G. H. Gong,H. Gong,W. Q. Gu,L. Guo,X. H. Guo,Y. H. Guo, Z. Guo,R. W. Hackenburg,S. Hans,M. He,K. M. Heeger,Y. K. Heng,A. Higuera,Y. B. Hsiung,B. Z. Hu, T. Hu,Z. J. Hu,H. X. Huang,X. T. Huang,Y. B. Huang,P. Huber,W. Huo,G. Hussain,D. E. Jaffe,K. L. Jen,X. L. Ji,X. P. Ji,R. A. Johnson,D. Jones,L. Kang,S. H. Kettell,L. W. Koerner,S. Kohn,M. Kramer,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. C. Li,S. J. Li,W. D. Li,X. N. Li,X. Q. Li,Y. F. Li,Z. B. Li,H. Liang,C. J. Lin, G. L. 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,C. Lu, H. Q. Lu,J. S. Lu,K. B. Luk,X. B. Ma,X. Y. Ma,Y. Q. Ma,Y. Malyshkin,C. Marshall,D. A. Martinez Caicedo,K. T. McDonald,R. D. McKeown,I. 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,R. M. Qiu, N. Raper,J. Ren, R. Rosero,B. Roskovec,X. C. Ruan,H. Steiner,J. L. Sun,K. Treskov,W. -H. Tse,C. E. Tull,B. Viren,V. Vorobel,C. H. Wang,J. Wang,M. Wang,N. Y. Wang, R. G. Wang,W. Wang,W. Wang,X. Wang,Y. F. Wang,Z. Wang,Z. Wang,Z. M. Wang,H. Y. Wei,L. H. Wei,L. J. Wen,K. Whisnant,C. G. White,T. Wise,H. L. H. Wong, S. C. F. Wong,E. orcester,Q. Wu,W. J. Wu,D. M. Xia,Z. Z. Xing,J. L. Xu,T. Xue,C. G. Yang,H. Yang,L. Yang,M. S. Yang,M. T. Yang,Y. Z. Yang, M. Ye,M. Yeh,B. L. Young,H. Z. Yu,Z. Y. Yu,B. B. Yue,S. Zeng,L. Zhan,C. Zhang,C. C. Zhang,F. Y. Zhang,H. H. Zhang,J. W. Zhang,Q. M. Zhang,R. Zhang,X. F. Zhang,X. T. Zhang,Y. M. Zhang,Y. M. Zhang,Y. X. Zhang,Y. Y. Zhang,Z. J. Zhang,Z. P. Zhang,Z. Y. Zhang,J. Zhao,P. Zheng, L. Zhou,H. L. Zhuang, J. H. Zou

PHYSICAL REVIEW D（2018）

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摘要

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 comprehensive neutron calibration and detailed data and simulation analysis. The new average IBD yield is determined to be (5.91±0.09)×10^-43 cm^2/fission with total uncertainty improved by 29 fission isotopes ^235U, ^238U, ^239Pu, and ^241Pu 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±0.014±0.023 (1.001±0.015±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.

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reactor antineutrino flux,improved measurement,daya

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