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Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay

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arxiv 1508.04233 v1 pith:3C2FWU2P submitted 2015-08-18 hep-ex nucl-exphysics.ins-det

Daya Bay Collaboration: F. P. An , A. B. Balantekin , H. R. Band , M. Bishai , S. Blyth , I. Butorov , D. Cao , G. F. Cao
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J. Cao W. R. Cen Y. L. Chan J. F. Chang L. C. Chang Y. Chang H. S. Chen Q. Y. Chen S. M. Chen Y. X. Chen Y. Chen J. H. Cheng J. Cheng Y. P. Cheng J. J. Cherwinka M. C. Chu J. P. Cummings J. de Arcos Z. Y. Deng X. F. Ding Y. Y. Ding M. V. Diwan J. Dove E. Draeger D. A. Dwyer W. R. Edwards S. R. Ely R. Gill M. Gonchar G. H. Gong H. Gong M. Grassi W. Q. Gu M. Y. Guan L. Guo X. H. Guo R. W. Hackenburg R. Han S. Hans M. He K. M. Heeger Y. K. Heng A. Higuera Y. K. Hor Y. B. Hsiung B. Z. Hu L. M. Hu L. J. Hu T. Hu W. Hu E. C. Huang H. X. Huang X. T. Huang P. Huber G. Hussain D. E. Jaffe P. Jaffke K. L. Jen S. Jetter X. P. Ji X. L. Ji J. B. Jiao R. A. Johnson L. Kang S. H. Kettell S. Kohn M. Kramer K. K. Kwan M. W. Kwok T. Kwok T. J. Langford K. Lau L. Lebanowski J. Lee R. T. Lei R. Leitner K. Y. Leung J. K. C. Leung C. A. Lewis D. J. Li F. Li G. S. Li Q. J. Li S. C. Li W. D. Li X. N. Li X. Q. Li Y. F. Li Z. B. Li H. Liang C. J. Lin G. L. Lin P. Y. Lin S. K. Lin J. J. Ling J. M. Link L. Littenberg B. R. Littlejohn D. W. Liu H. Liu J. L. Liu J. C. Liu S. S. Liu C. Lu H. Q. Lu J. S. Lu K. B. Luk Q. M. Ma X. Y. Ma X. B. Ma Y. Q. Ma D. A. Martinez Caicedo K. T. McDonald R. D. McKeown Y. Meng I. Mitchell J. Monari Kebwaro Y. Nakajima J. Napolitano D. Naumov E. Naumova H. Y. Ngai Z. Ning J. P. Ochoa-Ricoux A. Olshevski H.-R. Pan J. Park S. Patton V. Pec J. C. Peng L. E. Piilonen L. Pinsky C. S. J. Pun F. Z. Qi M. Qi X. Qian N. Raper B. Ren J. Ren R. Rosero B. Roskovec X. C. Ruan B. B. Shao H. Steiner G. X. Sun J. L. Sun W. Tang D. Taychenachev K. V. Tsang C. E. Tull Y. C. Tung N. Viaux B. Viren V. Vorobel C. H. Wang M. Wang N. Y. Wang R. G. Wang W. Wang W. W. Wang X. Wang Y. F. Wang Z. Wang Z. M. Wang H. Y. Wei L. J. Wen K. Whisnant C. G. White L. Whitehead T. Wise H. L. H. Wong S. C. F. Wong E. Worcester Q. Wu D. M. Xia J. K. Xia X. Xia Z. Z. Xing J. Y. Xu J. L. Xu J. Xu Y. Xu T. Xue J. Yan C. G. Yang L. Yang M. S. Yang M. T. Yang M. Ye M. Yeh B. L. Young G. Y. Yu Z. Y. Yu S. L. Zang L. Zhan C. Zhang H. H. Zhang J. W. Zhang Q. M. Zhang Y. M. Zhang Y. X. Zhang Z. J. Zhang Z. Y. Zhang Z. P. Zhang J. Zhao Q. W. Zhao Y. F. Zhao Y. B. Zhao L. Zheng W. L. Zhong L. Zhou N. Zhou H. L. Zhuang J. H. Zou
This is my paper · ORCID
classification hep-exnucl-exphysics.ins-det
keywords spectrumantineutrinoenergyfluxmeasuredmeasurementreactordaya
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

This Letter reports a measurement of the flux and energy spectrum of electron antineutrinos from six 2.9~GW$_{th}$ nuclear reactors with six detectors deployed in two near (effective baselines 512~m and 561~m) and one far (1,579~m) underground experimental halls in the Daya Bay experiment. Using 217 days of data, 296,721 and 41,589 inverse beta decay (IBD) candidates were detected in the near and far halls, respectively. The measured IBD yield is (1.55 $\pm$ 0.04) $\times$ 10$^{-18}$~cm$^2$/GW/day or (5.92 $\pm$ 0.14) $\times$ 10$^{-43}$~cm$^2$/fission. This flux measurement is consistent with previous short-baseline reactor antineutrino experiments and is $0.946\pm0.022$ ($0.991\pm0.023$) relative to the flux predicted with the Huber+Mueller (ILL+Vogel) fissile antineutrino model. The measured IBD positron energy spectrum deviates from both spectral predictions by more than 2$\sigma$ over the full energy range with a local significance of up to $\sim$4$\sigma$ between 4-6 MeV. A reactor antineutrino spectrum of IBD reactions is extracted from the measured positron energy spectrum for model-independent predictions.

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