Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay

F. P. An; A. B. Balantekin; H. R. Band; M. Bishai; S. Blyth; D. Cao; G. F. Cao; 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; Z. K. Cheng; J. J. Cherwinka; M. C. Chu; A. Chukanov; J. P. Cummings; J. De Arcos; Z. Y. Deng; X. F. Ding; Y. Y. Ding; M. V. Diwan; M. Dolgareva; J. Dove; D. A. Dwyer; W. R. Edwards; R. Gill; M. Gonchar; G. H. Gong; H. Gong; M. Grassi; W. Q. Gu; M. Y. Guan; L. Guo; R. P. Guo; X. H. Guo; Z. 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; T. Hu; W. Hu; E. C. Huang; H. X. Huang; X. T. Huang; P. Huber; W. Huo; G. Hussain; D. E. Jaffe; P. Jaffke; K. L. Jen; S. Jetter; X. P. Ji; X. L. Ji; J. B. Jiao; R. A. Johnson; D. Jones; J. Joshi; 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; J. H.C. Lee; R. T. Lei; R. Leitner; C. Li; D. J. Li; F. Li; G. S. Li; Q. J. Li; S. Li; S. C. Li; W. D. Li; X. N. 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; D. W. Liu; J. L. Liu; J. C. Liu; C. W. Loh; C. Lu; H. Q. Lu; J. S. Lu; K. B. Luk; Z. Lv; Q. M. Ma; X. Y. Ma; X. B. Ma; Y. Q. Ma; Y. Malyshkin; D. A. Martinez Caicedo; K. T. McDonald; R. D. McKeown; I. Mitchell; M. Mooney; Y. Nakajima; J. Napolitano; D. Naumov; E. Naumova; H. Y. Ngai; Z. Ning; 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; N. Raper; J. Ren; R. Rosero; B. Roskovec; X. C. Ruan; H. Steiner; G. X. Sun; J. L. Sun; W. Tang; D. Taychenachev; K. Treskov; K. V. Tsang; C. E. Tull; N. Viaux; B. Viren; V. Vorobel; C. H. Wang; M. Wang; N. Y. Wang; R. G. Wang; W. Wang; X. Wang; Y. F. Wang; Z. 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; C. H. Wu; Q. Wu; W. J. Wu; D. M. Xia; J. K. Xia; Z. Z. Xing; J. Y. Xu; J. L. Xu; Y. Xu; T. Xue; C. G. Yang; H. Yang; L. Yang; M. S. Yang; M. T. Yang; M. Ye; Z. Ye; M. Yeh; B. L. Young; Z. Y. Yu; S. Zeng; L. Zhan; C. Zhang; H. H. Zhang; J. W. Zhang; Q. M. Zhang; X. T. Zhang; Y. M. Zhang; Y. X. Zhang; Y. M. Zhang; Z. J. Zhang; Z. Y. Zhang; Z. P. Zhang; J. Zhao; Q. W. Zhao; Y. B. Zhao; W. L. Zhong; L. Zhou; N. Zhou; H. L. Zhuang; J. H. Zou

doi:10.1088/1674-1137/41/1/013002

Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay

F. P. An, A. B. Balantekin, H. R. Band, M. Bishai, S. Blyth, D. Cao, G. F. Cao, 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. ChengY. P. Cheng, Z. K. Cheng, J. J. Cherwinka, M. C. Chu, A. Chukanov, J. P. Cummings, J. De Arcos, Z. Y. Deng, X. F. Ding, Y. Y. Ding, M. V. Diwan, M. Dolgareva, J. Dove, D. A. Dwyer, W. R. Edwards, R. Gill, M. Gonchar, G. H. Gong, H. Gong, M. Grassi, W. Q. Gu, M. Y. Guan, L. Guo, R. P. Guo, X. H. Guo, Z. 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, T. Hu, W. Hu, E. C. Huang, H. X. Huang, X. T. Huang, P. Huber, W. Huo, G. Hussain, D. E. Jaffe, P. Jaffke, K. L. Jen, S. Jetter, X. P. Ji, X. L. Ji, J. B. Jiao, R. A. Johnson, D. Jones, J. Joshi, 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, J. H.C. Lee, R. T. Lei, R. Leitner, C. Li, D. J. Li, F. Li, G. S. Li, Q. J. Li, S. Li, S. C. Li, W. D. Li, X. N. 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, D. W. Liu, J. L. Liu, J. C. Liu, C. W. Loh, C. Lu, H. Q. Lu, J. S. Lu, K. B. Luk, Z. Lv, Q. M. Ma, X. Y. Ma, X. B. Ma, Y. Q. Ma, Y. Malyshkin, D. A. Martinez Caicedo, K. T. McDonald, R. D. McKeown, I. Mitchell, M. Mooney, Y. Nakajima, J. Napolitano, D. Naumov, E. Naumova, H. Y. Ngai, Z. Ning, 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, N. Raper, J. Ren, R. Rosero, B. Roskovec, X. C. Ruan, H. Steiner, G. X. Sun, J. L. Sun, W. Tang, D. Taychenachev, K. Treskov, K. V. Tsang, C. E. Tull, N. Viaux, B. Viren, V. Vorobel, C. H. Wang, M. Wang, N. Y. Wang, R. G. Wang, W. Wang, X. Wang, Y. F. Wang, Z. 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, C. H. Wu, Q. Wu, W. J. Wu, D. M. Xia, J. K. Xia, Z. Z. Xing, J. Y. Xu, J. L. Xu, Y. Xu, T. Xue, C. G. Yang, H. Yang, L. Yang, M. S. Yang, M. T. Yang, M. Ye, Z. Ye, M. Yeh, B. L. Young, Z. Y. Yu, S. Zeng, L. Zhan, C. Zhang, H. H. Zhang, J. W. Zhang, Q. M. Zhang, X. T. Zhang, Y. M. Zhang, Y. X. Zhang, Y. M. Zhang, Z. J. Zhang, Z. Y. Zhang, Z. P. Zhang, J. Zhao, Q. W. Zhao, Y. B. Zhao, W. L. Zhong, L. Zhou, N. Zhou, H. L. Zhuang, J. H. Zou

Research output: Contribution to journal › Article › peer-review

Abstract

A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GW_th nuclear reactors and detected by eight antineutrino detectors deployed in two near (560 m and 600 m flux-weighted baselines) and one far (1640 m flux-weighted baseline) underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay (IBD) candidates were detected. The IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be 0.946±0.020 (0.992±0.021) for the Huber+Mueller (ILL+Vogel) model. A 2.9σ deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4-6 MeV was found in the measured spectrum, with a local significance of 4.4σ. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions.

Original language	English (US)
Article number	013002
Journal	Chinese Physics C
Volume	41
Issue number	1
DOIs	https://doi.org/10.1088/1674-1137/41/1/013002
State	Published - Jan 2017

Keywords

Daya Bay
antineutrino flux
energy spectrum
reactor

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation
Astronomy and Astrophysics

Online availability

10.1088/1674-1137/41/1/013002

Library availability

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Cite this

An, F. P., Balantekin, A. B., Band, H. R., Bishai, M., Blyth, S., Cao, D., Cao, G. F., Cao, J., Cen, W. R., Chan, Y. L., Chang, J. F., Chang, L. C., Chang, Y., Chen, H. S., Chen, Q. Y., Chen, S. M., Chen, Y. X., Chen, Y., Cheng, J. H., ... Zou, J. H. (2017). Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay. Chinese Physics C, 41(1), Article 013002. https://doi.org/10.1088/1674-1137/41/1/013002

An, FP, Balantekin, AB, Band, HR, Bishai, M, Blyth, S, Cao, D, Cao, GF, Cao, J, Cen, WR, Chan, YL, Chang, JF, Chang, LC, Chang, Y, Chen, HS, Chen, QY, Chen, SM, Chen, YX, Chen, Y, Cheng, JH, Cheng, J, Cheng, YP, Cheng, ZK, Cherwinka, JJ, Chu, MC, Chukanov, A, Cummings, JP, De Arcos, J, Deng, ZY, Ding, XF, Ding, YY, Diwan, MV, Dolgareva, M, Dove, J, Dwyer, DA, Edwards, WR, Gill, R, Gonchar, M, Gong, GH, Gong, H, Grassi, M, Gu, WQ, Guan, MY, Guo, L, Guo, RP, Guo, XH, Guo, Z, Hackenburg, RW, Han, R, Hans, S, He, M, Heeger, KM, Heng, YK, Higuera, A, Hor, YK, Hsiung, YB, Hu, BZ, Hu, T, Hu, W, Huang, EC, Huang, HX, Huang, XT, Huber, P, Huo, W, Hussain, G, Jaffe, DE, Jaffke, P, Jen, KL, Jetter, S, Ji, XP, Ji, XL, Jiao, JB, Johnson, RA, Jones, D, Joshi, J, Kang, L, Kettell, SH, Kohn, S, Kramer, M, Kwan, KK, Kwok, MW, Kwok, T, Langford, TJ, Lau, K, Lebanowski, L, Lee, J, Lee, JHC, Lei, RT, Leitner, R, Li, C, Li, DJ, Li, F, Li, GS, Li, QJ, Li, S, Li, SC, Li, WD, Li, XN, Li, YF, Li, ZB, Liang, H, Lin, CJ, Lin, GL, Lin, S, Lin, SK, Lin, YC, Ling, JJ, Link, JM, Littenberg, L, Littlejohn, BR, Liu, DW, Liu, JL, Liu, JC, Loh, CW, Lu, C, Lu, HQ, Lu, JS, Luk, KB, Lv, Z, Ma, QM, Ma, XY, Ma, XB, Ma, YQ, Malyshkin, Y, Martinez Caicedo, DA, McDonald, KT, McKeown, RD, Mitchell, I, Mooney, M, Nakajima, Y, Napolitano, J, Naumov, D, Naumova, E, Ngai, HY, Ning, Z, Ochoa-Ricoux, JP, Olshevskiy, A, Pan, HR, Park, J, Patton, S, Pec, V, Peng, JC, Pinsky, L, Pun, CSJ, Qi, FZ, Qi, M, Qian, X, Raper, N, Ren, J, Rosero, R, Roskovec, B, Ruan, XC, Steiner, H, Sun, GX, Sun, JL, Tang, W, Taychenachev, D, Treskov, K, Tsang, KV, Tull, CE, Viaux, N, Viren, B, Vorobel, V, Wang, CH, Wang, M, Wang, NY, Wang, RG, Wang, W, Wang, X, Wang, YF, Wang, Z, Wang, Z, Wang, ZM, Wei, HY, Wen, LJ, Whisnant, K, White, CG, Whitehead, L, Wise, T, Wong, HLH, Wong, SCF, Worcester, E, Wu, CH, Wu, Q, Wu, WJ, Xia, DM, Xia, JK, Xing, ZZ, Xu, JY, Xu, JL, Xu, Y, Xue, T, Yang, CG, Yang, H, Yang, L, Yang, MS, Yang, MT, Ye, M, Ye, Z, Yeh, M, Young, BL, Yu, ZY, Zeng, S, Zhan, L, Zhang, C, Zhang, HH, Zhang, JW, Zhang, QM, Zhang, XT, Zhang, YM, Zhang, YX, Zhang, YM, Zhang, ZJ, Zhang, ZY, Zhang, ZP, Zhao, J, Zhao, QW, Zhao, YB, Zhong, WL, Zhou, L, Zhou, N, Zhuang, HL & Zou, JH 2017, 'Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay', Chinese Physics C, vol. 41, no. 1, 013002. https://doi.org/10.1088/1674-1137/41/1/013002

@article{c14b61bd41314df6815e87719c6264a8,

title = "Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay",

abstract = "A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GWth nuclear reactors and detected by eight antineutrino detectors deployed in two near (560 m and 600 m flux-weighted baselines) and one far (1640 m flux-weighted baseline) underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay (IBD) candidates were detected. The IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be 0.946±0.020 (0.992±0.021) for the Huber+Mueller (ILL+Vogel) model. A 2.9σ deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4-6 MeV was found in the measured spectrum, with a local significance of 4.4σ. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions.",

keywords = "Daya Bay, antineutrino flux, energy spectrum, reactor",

author = "An, {F. P.} and Balantekin, {A. B.} and Band, {H. R.} and M. Bishai and S. Blyth and D. Cao and Cao, {G. F.} and J. Cao and Cen, {W. R.} and Chan, {Y. L.} and Chang, {J. F.} and Chang, {L. C.} and Y. Chang and Chen, {H. S.} and Chen, {Q. Y.} and Chen, {S. M.} and Chen, {Y. X.} and Y. Chen and Cheng, {J. H.} and J. Cheng and Cheng, {Y. P.} and Cheng, {Z. K.} and Cherwinka, {J. J.} and Chu, {M. C.} and A. Chukanov and Cummings, {J. P.} and {De Arcos}, J. and Deng, {Z. Y.} and Ding, {X. F.} and Ding, {Y. Y.} and Diwan, {M. V.} and M. Dolgareva and J. Dove and Dwyer, {D. A.} and Edwards, {W. R.} and R. Gill and M. Gonchar and Gong, {G. H.} and H. Gong and M. Grassi and Gu, {W. Q.} and Guan, {M. Y.} and L. Guo and Guo, {R. P.} and Guo, {X. H.} and Z. Guo and Hackenburg, {R. W.} and R. Han and S. Hans and M. He and Heeger, {K. M.} and Heng, {Y. K.} and A. Higuera and Hor, {Y. K.} and Hsiung, {Y. B.} and Hu, {B. Z.} and T. Hu and W. Hu and Huang, {E. C.} and Huang, {H. X.} and Huang, {X. T.} and P. Huber and W. Huo and G. Hussain and Jaffe, {D. E.} and P. Jaffke and Jen, {K. L.} and S. Jetter and Ji, {X. P.} and Ji, {X. L.} and Jiao, {J. B.} and Johnson, {R. A.} and D. Jones and J. Joshi and L. Kang and Kettell, {S. H.} and S. Kohn and M. Kramer and Kwan, {K. K.} and Kwok, {M. W.} and T. Kwok and Langford, {T. J.} and K. Lau and L. Lebanowski and J. Lee and Lee, {J. H.C.} and Lei, {R. T.} and R. Leitner and C. Li and Li, {D. J.} and F. Li and Li, {G. S.} and Li, {Q. J.} and S. Li and Li, {S. C.} and Li, {W. D.} and Li, {X. N.} and Li, {Y. F.} and Li, {Z. B.} and H. Liang and Lin, {C. J.} and Lin, {G. L.} and S. Lin and Lin, {S. K.} and Lin, {Y. C.} and Ling, {J. J.} and Link, {J. M.} and L. Littenberg and Littlejohn, {B. R.} and Liu, {D. W.} and Liu, {J. L.} and Liu, {J. C.} and Loh, {C. W.} and C. Lu and Lu, {H. Q.} and Lu, {J. S.} and Luk, {K. B.} and Z. Lv and Ma, {Q. M.} and Ma, {X. Y.} and Ma, {X. B.} and Ma, {Y. Q.} and Y. Malyshkin and {Martinez Caicedo}, {D. A.} and McDonald, {K. T.} and McKeown, {R. D.} and I. Mitchell and M. Mooney and Y. Nakajima and J. Napolitano and D. Naumov and E. Naumova and Ngai, {H. Y.} and Z. Ning and Ochoa-Ricoux, {J. P.} and A. Olshevskiy and Pan, {H. R.} and J. Park and S. Patton and V. Pec and Peng, {J. C.} and L. Pinsky and Pun, {C. S.J.} and Qi, {F. Z.} and M. Qi and X. Qian and N. Raper and J. Ren and R. Rosero and B. Roskovec and Ruan, {X. C.} and H. Steiner and Sun, {G. X.} and Sun, {J. L.} and W. Tang and D. Taychenachev and K. Treskov and Tsang, {K. V.} and Tull, {C. E.} and N. Viaux and B. Viren and V. Vorobel and Wang, {C. H.} and M. Wang and Wang, {N. Y.} and Wang, {R. G.} and W. Wang and X. Wang and Wang, {Y. F.} and Z. Wang and Z. Wang and Wang, {Z. M.} and Wei, {H. Y.} and Wen, {L. J.} and K. Whisnant and White, {C. G.} and L. Whitehead and T. Wise and Wong, {H. L.H.} and Wong, {S. C.F.} and E. Worcester and Wu, {C. H.} and Q. Wu and Wu, {W. J.} and Xia, {D. M.} and Xia, {J. K.} and Xing, {Z. Z.} and Xu, {J. Y.} and Xu, {J. L.} and Y. Xu and T. Xue and Yang, {C. G.} and H. Yang and L. Yang and Yang, {M. S.} and Yang, {M. T.} and M. Ye and Z. Ye and M. Yeh and Young, {B. L.} and Yu, {Z. Y.} and S. Zeng and L. Zhan and C. Zhang and Zhang, {H. H.} and Zhang, {J. W.} and Zhang, {Q. M.} and Zhang, {X. T.} and Zhang, {Y. M.} and Zhang, {Y. X.} and Zhang, {Y. M.} and Zhang, {Z. J.} and Zhang, {Z. Y.} and Zhang, {Z. P.} and J. Zhao and Zhao, {Q. W.} and Zhao, {Y. B.} and Zhong, {W. L.} and L. Zhou and N. Zhou and Zhuang, {H. L.} and Zou, {J. H.}",

note = "Funding Information: Supported in part by the Ministry of Science and Technology of China, the United States Department of Energy, the Chinese Academy of Sciences, the CAS Center for Excellence in Particle Physics, the National Natural Science Foundation of China, the Guangdong provincial government, the Shenzhen municipal government, the China General Nuclear Power Group, the Research Grants Council of the Hong Kong Special Administrative Region of China, the MOST and MOE in Taiwan, the U.S. National Science Foundation, the Ministry of Education, Youth and Sports of the Czech Republic, the Joint Institute of Nuclear Research in Dubna, Russia, the NSFC-RFBR joint research program, the National Commission for Scientific and Technological Research of Chile Publisher Copyright: {\textcopyright} Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.",

year = "2017",

month = jan,

doi = "10.1088/1674-1137/41/1/013002",

language = "English (US)",

volume = "41",

journal = "Chinese Physics C",

issn = "1674-1137",

publisher = "IOP Publishing Ltd.",

number = "1",

}

TY - JOUR

T1 - Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay

AU - An, F. P.

AU - Balantekin, A. B.

AU - Band, H. R.

AU - Bishai, M.

AU - Blyth, S.

AU - Cao, D.

AU - Cao, G. F.

AU - Cao, J.

AU - Cen, W. R.

AU - Chan, Y. L.

AU - Chang, J. F.

AU - Chang, L. C.

AU - Chang, Y.

AU - Chen, H. S.

AU - Chen, Q. Y.

AU - Chen, S. M.

AU - Chen, Y. X.

AU - Chen, Y.

AU - Cheng, J. H.

AU - Cheng, J.

AU - Cheng, Y. P.

AU - Cheng, Z. K.

AU - Cherwinka, J. J.

AU - Chu, M. C.

AU - Chukanov, A.

AU - Cummings, J. P.

AU - De Arcos, J.

AU - Deng, Z. Y.

AU - Ding, X. F.

AU - Ding, Y. Y.

AU - Diwan, M. V.

AU - Dolgareva, M.

AU - Dove, J.

AU - Dwyer, D. A.

AU - Edwards, W. R.

AU - Gill, R.

AU - Gonchar, M.

AU - Gong, G. H.

AU - Gong, H.

AU - Grassi, M.

AU - Gu, W. Q.

AU - Guan, M. Y.

AU - Guo, L.

AU - Guo, R. P.

AU - Guo, X. H.

AU - Guo, Z.

AU - Hackenburg, R. W.

AU - Han, R.

AU - Hans, S.

AU - He, M.

AU - Heeger, K. M.

AU - Heng, Y. K.

AU - Higuera, A.

AU - Hor, Y. K.

AU - Hsiung, Y. B.

AU - Hu, B. Z.

AU - Hu, T.

AU - Hu, W.

AU - Huang, E. C.

AU - Huang, H. X.

AU - Huang, X. T.

AU - Huber, P.

AU - Huo, W.

AU - Hussain, G.

AU - Jaffe, D. E.

AU - Jaffke, P.

AU - Jen, K. L.

AU - Jetter, S.

AU - Ji, X. P.

AU - Ji, X. L.

AU - Jiao, J. B.

AU - Johnson, R. A.

AU - Jones, D.

AU - Joshi, J.

AU - Kang, L.

AU - Kettell, S. H.

AU - Kohn, S.

AU - Kramer, M.

AU - Kwan, K. K.

AU - Kwok, M. W.

AU - Kwok, T.

AU - Langford, T. J.

AU - Lau, K.

AU - Lebanowski, L.

AU - Lee, J.

AU - Lee, J. H.C.

AU - Lei, R. T.

AU - Leitner, R.

AU - Li, C.

AU - Li, D. J.

AU - Li, F.

AU - Li, G. S.

AU - Li, Q. J.

AU - Li, S.

AU - Li, S. C.

AU - Li, W. D.

AU - Li, X. N.

AU - Li, Y. F.

AU - Li, Z. B.

AU - Liang, H.

AU - Lin, C. J.

AU - Lin, G. L.

AU - Lin, S.

AU - Lin, S. K.

AU - Lin, Y. C.

AU - Ling, J. J.

AU - Link, J. M.

AU - Littenberg, L.

AU - Littlejohn, B. R.

AU - Liu, D. W.

AU - Liu, J. L.

AU - Liu, J. C.

AU - Loh, C. W.

AU - Lu, C.

AU - Lu, H. Q.

AU - Lu, J. S.

AU - Luk, K. B.

AU - Lv, Z.

AU - Ma, Q. M.

AU - Ma, X. Y.

AU - Ma, X. B.

AU - Ma, Y. Q.

AU - Malyshkin, Y.

AU - Martinez Caicedo, D. A.

AU - McDonald, K. T.

AU - McKeown, R. D.

AU - Mitchell, I.

AU - Mooney, M.

AU - Nakajima, Y.

AU - Napolitano, J.

AU - Naumov, D.

AU - Naumova, E.

AU - Ngai, H. Y.

AU - Ning, Z.

AU - Ochoa-Ricoux, J. P.

AU - Olshevskiy, A.

AU - Pan, H. R.

AU - Park, J.

AU - Patton, S.

AU - Pec, V.

AU - Peng, J. C.

AU - Pinsky, L.

AU - Pun, C. S.J.

AU - Qi, F. Z.

AU - Qi, M.

AU - Qian, X.

AU - Raper, N.

AU - Ren, J.

AU - Rosero, R.

AU - Roskovec, B.

AU - Ruan, X. C.

AU - Steiner, H.

AU - Sun, G. X.

AU - Sun, J. L.

AU - Tang, W.

AU - Taychenachev, D.

AU - Treskov, K.

AU - Tsang, K. V.

AU - Tull, C. E.

AU - Viaux, N.

AU - Viren, B.

AU - Vorobel, V.

AU - Wang, C. H.

AU - Wang, M.

AU - Wang, N. Y.

AU - Wang, R. G.

AU - Wang, W.

AU - Wang, X.

AU - Wang, Y. F.

AU - Wang, Z.

AU - Wang, Z. M.

AU - Wei, H. Y.

AU - Wen, L. J.

AU - Whisnant, K.

AU - White, C. G.

AU - Whitehead, L.

AU - Wise, T.

AU - Wong, H. L.H.

AU - Wong, S. C.F.

AU - Worcester, E.

AU - Wu, C. H.

AU - Wu, Q.

AU - Wu, W. J.

AU - Xia, D. M.

AU - Xia, J. K.

AU - Xing, Z. Z.

AU - Xu, J. Y.

AU - Xu, J. L.

AU - Xu, Y.

AU - Xue, T.

AU - Yang, C. G.

AU - Yang, H.

AU - Yang, L.

AU - Yang, M. S.

AU - Yang, M. T.

AU - Ye, M.

AU - Ye, Z.

AU - Yeh, M.

AU - Young, B. L.

AU - Yu, Z. Y.

AU - Zeng, S.

AU - Zhan, L.

AU - Zhang, C.

AU - Zhang, H. H.

AU - Zhang, J. W.

AU - Zhang, Q. M.

AU - Zhang, X. T.

AU - Zhang, Y. M.

AU - Zhang, Y. X.

AU - Zhang, Y. M.

AU - Zhang, Z. J.

AU - Zhang, Z. Y.

AU - Zhang, Z. P.

AU - Zhao, J.

AU - Zhao, Q. W.

AU - Zhao, Y. B.

AU - Zhong, W. L.

AU - Zhou, L.

AU - Zhou, N.

AU - Zhuang, H. L.

AU - Zou, J. H.

N1 - Funding Information: Supported in part by the Ministry of Science and Technology of China, the United States Department of Energy, the Chinese Academy of Sciences, the CAS Center for Excellence in Particle Physics, the National Natural Science Foundation of China, the Guangdong provincial government, the Shenzhen municipal government, the China General Nuclear Power Group, the Research Grants Council of the Hong Kong Special Administrative Region of China, the MOST and MOE in Taiwan, the U.S. National Science Foundation, the Ministry of Education, Youth and Sports of the Czech Republic, the Joint Institute of Nuclear Research in Dubna, Russia, the NSFC-RFBR joint research program, the National Commission for Scientific and Technological Research of Chile Publisher Copyright: © Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

PY - 2017/1

Y1 - 2017/1

N2 - A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GWth nuclear reactors and detected by eight antineutrino detectors deployed in two near (560 m and 600 m flux-weighted baselines) and one far (1640 m flux-weighted baseline) underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay (IBD) candidates were detected. The IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be 0.946±0.020 (0.992±0.021) for the Huber+Mueller (ILL+Vogel) model. A 2.9σ deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4-6 MeV was found in the measured spectrum, with a local significance of 4.4σ. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions.

AB - A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GWth nuclear reactors and detected by eight antineutrino detectors deployed in two near (560 m and 600 m flux-weighted baselines) and one far (1640 m flux-weighted baseline) underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay (IBD) candidates were detected. The IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be 0.946±0.020 (0.992±0.021) for the Huber+Mueller (ILL+Vogel) model. A 2.9σ deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4-6 MeV was found in the measured spectrum, with a local significance of 4.4σ. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions.

KW - Daya Bay

KW - antineutrino flux

KW - energy spectrum

KW - reactor

UR - http://www.scopus.com/inward/record.url?scp=85010403976&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85010403976&partnerID=8YFLogxK

U2 - 10.1088/1674-1137/41/1/013002

DO - 10.1088/1674-1137/41/1/013002

M3 - Article

AN - SCOPUS:85010403976

SN - 1674-1137

VL - 41

JO - Chinese Physics C

JF - Chinese Physics C

IS - 1

M1 - 013002

ER -

Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay

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