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Improved measurement of the reactor antineutrino flux at Daya Bay

D. Adey1, F. P. An2, A. B. Balantekin3, H. R. Band4, M. Bishai5, S. Blyth6,7, D. Cao8, G. F. Cao1, J. Cao1 et al. (Daya Bay Collaboration)

J. Cao1, Y. L. Chan9, J. F. Chang1, Y. Chang7, H. S. Chen1, S. M. Chen10, Y. Chen11, Y. X. Chen12, J. Cheng13, Z. K. Cheng14, J. J. Cherwinka3, M. C. Chu9, A. Chukanov15, J. P. Cummings16, F. S. Deng17, Y. Y. Ding1, M. V. Diwan5, M. Dolgareva15, J. Dove18, D. A. Dwyer19, W. R. Edwards19, M. Gonchar15, G. H. Gong10, H. Gong10, W. Q. Gu5, L. Guo10, X. H. Guo20, Y. H. Guo21, Z. Guo10, R. W. Hackenburg5, S. Hans5,*, M. He1, K. M. Heeger4, Y. K. Heng1, A. Higuera22, Y. B. Hsiung6, B. Z. Hu6, T. Hu1, Z. J. Hu14, H. X. Huang23, X. T. Huang13, Y. B. Huang1, P. Huber24, W. Huo17, G. Hussain10, D. E. Jaffe5, K. L. Jen25, X. L. Ji1, X. P. Ji5, R. A. Johnson26, D. Jones27, L. Kang28, S. H. Kettell5, L. W. Koerner22, S. Kohn29, M. Kramer19,29, T. J. Langford4, L. Lebanowski10, J. Lee19, J. H. C. Lee30, R. T. Lei28, R. Leitner31, J. K. C. Leung30, C. Li13, F. Li1, H. L. Li13, Q. J. Li1, S. Li28, S. C. Li24, S. J. Li14, W. D. Li1, X. N. Li1, X. Q. Li32, Y. F. Li1, Z. B. Li14, H. Liang17, C. J. Lin19, G. L. Lin25, S. Lin28, S. K. Lin22, Y.-C. Lin6, J. J. Ling14, J. M. Link24, L. Littenberg5, B. R. Littlejohn33, J. C. Liu1, J. L. Liu34, Y. Liu13, Y. H. Liu8, C. W. Loh8, C. Lu35, H. Q. Lu1, J. S. Lu1, K. B. Luk29,19, X. B. Ma12, X. Y. Ma1, Y. Q. Ma1, Y. Malyshkin36, C. Marshall19, D. A. Martinez Caicedo33, K. T. McDonald35, R. D. McKeown37,38, I. Mitchell22, L. Mora Lepin36, J. Napolitano27, D. Naumov15, E. Naumova15, J. P. Ochoa-Ricoux36, A. Olshevskiy15, H.-R. Pan6, J. Park24, S. Patton19, V. Pec31, J. C. Peng18, L. Pinsky22, C. S. J. Pun30, F. Z. Qi1, M. Qi8, X. Qian5, R. M. Qiu12, N. Raper14, J. Ren23, R. Rosero5, B. Roskovec36, X. C. Ruan23, H. Steiner29,19, J. L. Sun39, K. Treskov15, W.-H. Tse9, C. E. Tull19, B. Viren5, V. Vorobel31, C. H. Wang7, J. Wang14, M. Wang13, N. Y. Wang20, R. G. Wang1, W. Wang14,38, W. Wang8, X. Wang40, Y. F. Wang1, Z. Wang1, Z. Wang10, Z. M. Wang1, H. Y. Wei5, L. H. Wei1, L. J. Wen1, K. Whisnant41, C. G. White33, T. Wise4, H. L. H. Wong29,19, S. C. F. Wong14, E. Worcester5, Q. Wu13, W. J. Wu1, D. M. Xia42, Z. Z. Xing1, J. L. Xu1, T. Xue10, C. G. Yang1, H. Yang8, L. Yang28, M. S. Yang1, M. T. Yang13, Y. Z. Yang14, M. Ye1, M. Yeh5, B. L. Young41, H. Z. Yu14, Z. Y. Yu1, B. B. Yue14, S. Zeng1, L. Zhan1, C. Zhang5, C. C. Zhang1, F. Y. Zhang34, H. H. Zhang14, J. W. Zhang1, Q. M. Zhang21, R. Zhang8, X. F. Zhang1, X. T. Zhang1, Y. M. Zhang14, Y. M. Zhang10, Y. X. Zhang39, Y. Y. Zhang34, Z. J. Zhang28, Z. P. Zhang17, Z. Y. Zhang1, J. Zhao1, P. Zheng28, L. Zhou1, H. L. Zhuang1, and J. H. Zou1 (Daya Bay Collaboration)

  • 1Institute of High Energy Physics, Beijing
  • 2Institute of Modern Physics, East China University of Science and Technology, Shanghai
  • 3University of Wisconsin, Madison, Wisconsin 53706
  • 4Wright Laboratory and Department of Physics, Yale University, New Haven, Connecticut 06520
  • 5Brookhaven National Laboratory, Upton, New York 11973
  • 6Department of Physics, National Taiwan University, Taipei
  • 7National United University, Miao-Li
  • 8Nanjing University, Nanjing
  • 9Chinese University of Hong Kong, Hong Kong
  • 10Department of Engineering Physics, Tsinghua University, Beijing
  • 11Shenzhen University, Shenzhen
  • 12North China Electric Power University, Beijing
  • 13Shandong University, Jinan
  • 14Sun Yat-Sen (Zhongshan) University, Guangzhou
  • 15Joint Institute for Nuclear Research, Dubna, Moscow Region
  • 16Siena College, Loudonville, New York 12211
  • 17University of Science and Technology of China, Hefei
  • 18Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
  • 19Lawrence Berkeley National Laboratory, Berkeley, California 94720
  • 20Beijing Normal University, Beijing
  • 21Department of Nuclear Science and Technology, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an
  • 22Department of Physics, University of Houston, Houston, Texas 77204
  • 23China Institute of Atomic Energy, Beijing
  • 24Center for Neutrino Physics, Virginia Tech, Blacksburg, Virginia 24061
  • 25Institute of Physics, National Chiao-Tung University, Hsinchu
  • 26Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221
  • 27Department of Physics, College of Science and Technology, Temple University, Philadelphia, Pennsylvania 19122
  • 28Dongguan University of Technology, Dongguan
  • 29Department of Physics, University of California, Berkeley, California 94720
  • 30Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong
  • 31Charles University, Faculty of Mathematics and Physics, Prague
  • 32School of Physics, Nankai University, Tianjin
  • 33Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616
  • 34Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai Laboratory for Particle Physics and Cosmology, Shanghai
  • 35Joseph Henry Laboratories, Princeton University, Princeton, New Jersey 08544
  • 36Instituto de Física, Pontificia Universidad Católica de Chile, Santiago
  • 37California Institute of Technology, Pasadena, California 91125
  • 38College of William and Mary, Williamsburg, Virginia 23187
  • 39China General Nuclear Power Group, Shenzhen
  • 40College of Electronic Science and Engineering, National University of Defense Technology, Changsha
  • 41Iowa State University, Ames, Iowa 50011
  • 42Chongqing University, Chongqing

  • *Now at Department of Chemistry and Chemical Technology, Bronx Community College, Bronx, New York 10453, USA.
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Phys. Rev. D 100, 052004 – Published 9 September, 2019

DOI: https://doi.org/10.1103/PhysRevD.100.052004

Abstract

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±0.09)×10−43  cm2/fission with total uncertainty improved by 29%. The corresponding mean fission fractions from the four main fission isotopes U235, U238, Pu239, and Pu241 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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Phys. Rev. D 100, 052004– Published 9 September, 2019
  • Received 3 September 2018
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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.

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