First Measurement of High-Energy Reactor Antineutrinos at Daya Bay

F. P. An; W. D. Bai; A. B. Balantekin; M. Bishai; S. Blyth; G. F. Cao; J. Cao; J. F. Chang; Y. Chang; H. S. Chen; H. Y. Chen; S. M. Chen; Y. Chen; Y. X. Chen; J. Cheng; Z. K. Cheng; J. J. Cherwinka; M. C. Chu; J. P. Cummings; O. Dalager; F. S. Deng; Y. Y. Ding; M. V. Diwan; T. Dohnal; D. Dolzhikov; J. Dove; D. A. Dwyer; J. P. Gallo; M. Gonchar; G. H. Gong; H. Gong; W. Q. Gu; J. Y. Guo; L. Guo; X. H. Guo; Y. H. Guo; Z. Guo; R. W. Hackenburg; S. Hans; M. He; K. M. Heeger; Y. K. Heng; Y. K. Hor; Y. B. Hsiung; B. Z. Hu; J. R. Hu; T. Hu; Z. J. Hu; H. X. Huang; J. H. Huang; X. T. Huang; Y. B. Huang; P. Huber; D. E. Jaffe; K. L. Jen; X. L. Ji; X. P. Ji; R. A. Johnson; D. Jones; L. Kang; S. H. Kettell; S. Kohn; M. Kramer; T. J. Langford; J. Lee; J. H.C. Lee; R. T. Lei; R. Leitner; J. K.C. Leung; F. Li; H. L. Li; J. J. Li; Q. J. Li; R. H. Li; S. 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; S. Lin; J. J. Ling; J. M. Link; L. Littenberg; B. R. Littlejohn; J. C. Liu; J. L. Liu; J. X. Liu; C. Lu; H. Q. Lu; K. B. Luk; B. Z. Ma; X. B. Ma; X. Y. Ma; Y. Q. Ma; R. C. Mandujano; C. Marshall; K. T. McDonald; R. D. McKeown; Y. Meng; J. Napolitano; D. Naumov; E. Naumova; T. M.T. Nguyen; J. P. Ochoa-Ricoux; A. Olshevskiy; H. R. Pan; J. Park; S. Patton; J. C. Peng; C. S.J. Pun; F. Z. Qi; M. Qi; X. Qian; N. Raper; J. Ren; C. Morales Reveco; R. Rosero; B. Roskovec; X. C. Ruan; H. Steiner; J. L. Sun; T. Tmej; 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; X. Wang; Y. 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; H. L.H. Wong; E. Worcester; D. R. Wu; Q. Wu; W. J. Wu; D. M. Xia; Z. Q. Xie; Z. Z. Xing; H. K. Xu; J. L. Xu; T. Xu; T. Xue; C. G. Yang; L. Yang; Y. Z. Yang; H. F. Yao; M. Ye; M. Yeh; B. L. Young; H. Z. Yu; Z. Y. Yu; B. B. Yue; V. Zavadskyi; S. Zeng; Y. Zeng; L. Zhan; C. Zhang; F. Y. Zhang; H. H. Zhang; J. L. Zhang; J. W. Zhang; Q. M. Zhang; S. Q. Zhang; X. T. Zhang; Y. M. Zhang; Y. X. Zhang; Y. Y. Zhang; Z. J. Zhang; Z. P. Zhang; Z. Y. Zhang; J. Zhao; R. Z. Zhao; L. Zhou; H. L. Zhuang; J. H. Zou

doi:10.1103/PhysRevLett.129.041801

First Measurement of High-Energy Reactor Antineutrinos at Daya Bay

F. P. An, W. D. Bai, A. B. Balantekin, M. Bishai, S. Blyth, G. F. Cao, J. Cao, J. F. Chang, Y. Chang, H. S. Chen, H. Y. Chen, S. M. Chen, Y. Chen, Y. X. Chen, J. Cheng, Z. K. Cheng, J. J. Cherwinka, M. C. Chu, J. P. Cummings, O. DalagerF. S. Deng, Y. Y. Ding, M. V. Diwan, T. Dohnal, D. Dolzhikov, J. Dove, D. A. Dwyer, J. P. Gallo, M. Gonchar, G. H. Gong, H. Gong, W. Q. Gu, J. Y. Guo, L. Guo, X. H. Guo, Y. H. Guo, Z. Guo, R. W. Hackenburg, S. Hans, M. He, K. M. Heeger, Y. K. Heng, Y. K. Hor, Y. B. Hsiung, B. Z. Hu, J. R. Hu, T. Hu, Z. J. Hu, H. X. Huang, J. H. Huang, X. T. Huang, Y. B. Huang, P. Huber, D. E. Jaffe, K. L. Jen, X. L. Ji, X. P. Ji, R. A. Johnson, D. Jones, L. Kang, S. H. Kettell, S. Kohn, M. Kramer, T. J. Langford, J. Lee, J. H.C. Lee, R. T. Lei, R. Leitner, J. K.C. Leung, F. Li, H. L. Li, J. J. Li, Q. J. Li, R. H. Li, S. 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, S. Lin, J. J. Ling, J. M. Link, L. Littenberg, B. R. Littlejohn, J. C. Liu, J. L. Liu, J. X. Liu, C. Lu, H. Q. Lu, K. B. Luk, B. Z. Ma, X. B. Ma, X. Y. Ma, Y. Q. Ma, R. C. Mandujano, C. Marshall, K. T. McDonald, R. D. McKeown, Y. Meng, J. Napolitano, D. Naumov, E. Naumova, T. M.T. Nguyen, J. P. Ochoa-Ricoux, A. Olshevskiy, H. R. Pan, J. Park, S. Patton, J. C. Peng, C. S.J. Pun, F. Z. Qi, M. Qi, X. Qian, N. Raper, J. Ren, C. Morales Reveco, R. Rosero, B. Roskovec, X. C. Ruan, H. Steiner, J. L. Sun, T. Tmej, 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, X. Wang, Y. 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, H. L.H. Wong, E. Worcester, D. R. Wu, Q. Wu, W. J. Wu, D. M. Xia, Z. Q. Xie, Z. Z. Xing, H. K. Xu, J. L. Xu, T. Xu, T. Xue, C. G. Yang, L. Yang, Y. Z. Yang, H. F. Yao, M. Ye, M. Yeh, B. L. Young, H. Z. Yu, Z. Y. Yu, B. B. Yue, V. Zavadskyi, S. Zeng, Y. Zeng, L. Zhan, C. Zhang, F. Y. Zhang, H. H. Zhang, J. L. Zhang, J. W. Zhang, Q. M. Zhang, S. Q. Zhang, X. T. Zhang, Y. M. Zhang, Y. X. Zhang, Y. Y. Zhang, Z. J. Zhang, Z. P. Zhang, Z. Y. Zhang, J. Zhao, R. Z. Zhao, L. Zhou, H. L. Zhuang, J. H. Zou

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摘要

This Letter reports the first measurement of high-energy reactor antineutrinos at Daya Bay, with nearly 9000 inverse beta decay candidates in the prompt energy region of 8-12 MeV observed over 1958 days of data collection. A multivariate analysis is used to separate 2500 signal events from background statistically. The hypothesis of no reactor antineutrinos with neutrino energy above 10 MeV is rejected with a significance of 6.2 standard deviations. A 29% antineutrino flux deficit in the prompt energy region of 8-11 MeV is observed compared to a recent model prediction. We provide the unfolded antineutrino spectrum above 7 MeV as a data-based reference for other experiments. This result provides the first direct observation of the production of antineutrinos from several high-Qβ isotopes in commercial reactors.

原文	English
文章編號	041801
期刊	Physical Review Letters
卷	129
發行號	4
DOIs	https://doi.org/10.1103/PhysRevLett.129.041801
出版狀態	Published - 22 7月 2022

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10.1103/PhysRevLett.129.041801

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An, F. P., Bai, W. D., Balantekin, A. B., Bishai, M., Blyth, S., Cao, G. F., Cao, J., Chang, J. F., Chang, Y., Chen, H. S., Chen, H. Y., Chen, S. M., Chen, Y., Chen, Y. X., Cheng, J., Cheng, Z. K., Cherwinka, J. J., Chu, M. C., Cummings, J. P., ... Zou, J. H. (2022). First Measurement of High-Energy Reactor Antineutrinos at Daya Bay. Physical Review Letters, 129(4), Article 041801. https://doi.org/10.1103/PhysRevLett.129.041801

@article{f71e48c020684b3e85cadbda4e0fc7f5,

title = "First Measurement of High-Energy Reactor Antineutrinos at Daya Bay",

abstract = "This Letter reports the first measurement of high-energy reactor antineutrinos at Daya Bay, with nearly 9000 inverse beta decay candidates in the prompt energy region of 8-12 MeV observed over 1958 days of data collection. A multivariate analysis is used to separate 2500 signal events from background statistically. The hypothesis of no reactor antineutrinos with neutrino energy above 10 MeV is rejected with a significance of 6.2 standard deviations. A 29% antineutrino flux deficit in the prompt energy region of 8-11 MeV is observed compared to a recent model prediction. We provide the unfolded antineutrino spectrum above 7 MeV as a data-based reference for other experiments. This result provides the first direct observation of the production of antineutrinos from several high-Qβ isotopes in commercial reactors.",

author = "An, {F. P.} and Bai, {W. D.} and Balantekin, {A. B.} and M. Bishai and S. Blyth and Cao, {G. F.} and J. Cao and Chang, {J. F.} and Y. Chang and Chen, {H. S.} and Chen, {H. Y.} and Chen, {S. M.} and Y. Chen and Chen, {Y. X.} and J. Cheng and Cheng, {Z. K.} and Cherwinka, {J. J.} and Chu, {M. C.} and Cummings, {J. P.} and O. Dalager and Deng, {F. S.} and Ding, {Y. Y.} and Diwan, {M. V.} and T. Dohnal and D. Dolzhikov and J. Dove and Dwyer, {D. A.} and Gallo, {J. P.} and M. Gonchar and Gong, {G. H.} and H. Gong and Gu, {W. Q.} and Guo, {J. Y.} and L. Guo and Guo, {X. H.} and Guo, {Y. H.} and Z. Guo and Hackenburg, {R. W.} and S. Hans and M. He and Heeger, {K. M.} and Heng, {Y. K.} and Hor, {Y. K.} and Hsiung, {Y. B.} and Hu, {B. Z.} and Hu, {J. R.} and T. Hu and Hu, {Z. J.} and Huang, {H. X.} and Huang, {J. H.} and Huang, {X. T.} and Huang, {Y. B.} and P. Huber and Jaffe, {D. E.} and Jen, {K. L.} and Ji, {X. L.} and Ji, {X. P.} and Johnson, {R. A.} and D. Jones and L. Kang and Kettell, {S. H.} and S. Kohn and M. Kramer and Langford, {T. J.} and J. Lee and Lee, {J. H.C.} and Lei, {R. T.} and R. Leitner and Leung, {J. K.C.} and F. Li and Li, {H. L.} and Li, {J. J.} and Li, {Q. J.} and Li, {R. H.} and S. Li and Li, {S. C.} and Li, {W. D.} and Li, {X. N.} and Li, {X. Q.} and Li, {Y. F.} and Li, {Z. B.} and H. Liang and Lin, {C. J.} and Lin, {G. L.} and S. Lin and Ling, {J. J.} and Link, {J. M.} and L. Littenberg and Littlejohn, {B. R.} and Liu, {J. C.} and Liu, {J. L.} and Liu, {J. X.} and C. Lu and Lu, {H. Q.} and Luk, {K. B.} and Ma, {B. Z.} and Ma, {X. B.} and Ma, {X. Y.} and Ma, {Y. Q.} and Mandujano, {R. C.} and C. Marshall and McDonald, {K. T.} and McKeown, {R. D.} and Y. Meng and J. Napolitano and D. Naumov and E. Naumova and Nguyen, {T. M.T.} and Ochoa-Ricoux, {J. P.} and A. Olshevskiy and Pan, {H. R.} and J. Park and S. Patton and Peng, {J. C.} and Pun, {C. S.J.} and Qi, {F. Z.} and M. Qi and X. Qian and N. Raper and J. Ren and {Morales Reveco}, C. and R. Rosero and B. Roskovec and Ruan, {X. C.} and H. Steiner and Sun, {J. L.} and T. Tmej and K. Treskov and Tse, {W. H.} and Tull, {C. E.} and B. Viren and V. Vorobel and Wang, {C. H.} and J. Wang and M. Wang and Wang, {N. Y.} and Wang, {R. G.} and W. Wang and X. Wang and Y. Wang and Wang, {Y. F.} and Z. Wang and Z. Wang and Wang, {Z. M.} and Wei, {H. Y.} and Wei, {L. H.} and Wen, {L. J.} and K. Whisnant and White, {C. G.} and Wong, {H. L.H.} and E. Worcester and Wu, {D. R.} and Q. Wu and Wu, {W. J.} and Xia, {D. M.} and Xie, {Z. Q.} and Xing, {Z. Z.} and Xu, {H. K.} and Xu, {J. L.} and T. Xu and T. Xue and Yang, {C. G.} and L. Yang and Yang, {Y. Z.} and Yao, {H. F.} and M. Ye and M. Yeh and Young, {B. L.} and Yu, {H. Z.} and Yu, {Z. Y.} and Yue, {B. B.} and V. Zavadskyi and S. Zeng and Y. Zeng and L. Zhan and C. Zhang and Zhang, {F. Y.} and Zhang, {H. H.} and Zhang, {J. L.} and Zhang, {J. W.} and Zhang, {Q. M.} and Zhang, {S. Q.} and Zhang, {X. T.} and Zhang, {Y. M.} and Zhang, {Y. X.} and Zhang, {Y. Y.} and Zhang, {Z. J.} and Zhang, {Z. P.} and Zhang, {Z. Y.} and J. Zhao and Zhao, {R. Z.} and L. Zhou and Zhuang, {H. L.} and Zou, {J. H.}",

note = "Publisher Copyright: {\textcopyright} 2022 authors. Published by the American Physical Society.",

year = "2022",

month = jul,

day = "22",

doi = "10.1103/PhysRevLett.129.041801",

language = "English",

volume = "129",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "4",

}

An, FP, Bai, WD, Balantekin, AB, Bishai, M, Blyth, S, Cao, GF, Cao, J, Chang, JF, Chang, Y, Chen, HS, Chen, HY, Chen, SM, Chen, Y, Chen, YX, Cheng, J, Cheng, ZK, Cherwinka, JJ, Chu, MC, Cummings, JP, Dalager, O, Deng, FS, Ding, YY, Diwan, MV, Dohnal, T, Dolzhikov, D, Dove, J, Dwyer, DA, Gallo, JP, Gonchar, M, Gong, GH, Gong, H, Gu, WQ, Guo, JY, Guo, L, Guo, XH, Guo, YH, Guo, Z, Hackenburg, RW, Hans, S, He, M, Heeger, KM, Heng, YK, Hor, YK, Hsiung, YB, Hu, BZ, Hu, JR, Hu, T, Hu, ZJ, Huang, HX, Huang, JH, Huang, XT, Huang, YB, Huber, P, Jaffe, DE, Jen, KL, Ji, XL, Ji, XP, Johnson, RA, Jones, D, Kang, L, Kettell, SH, Kohn, S, Kramer, M, Langford, TJ, Lee, J, Lee, JHC, Lei, RT, Leitner, R, Leung, JKC, Li, F, Li, HL, Li, JJ, Li, QJ, Li, RH, Li, S, Li, SC, Li, WD, Li, XN, Li, XQ, Li, YF, Li, ZB, Liang, H, Lin, CJ, Lin, GL, Lin, S, Ling, JJ, Link, JM, Littenberg, L, Littlejohn, BR, Liu, JC, Liu, JL, Liu, JX, Lu, C, Lu, HQ, Luk, KB, Ma, BZ, Ma, XB, Ma, XY, Ma, YQ, Mandujano, RC, Marshall, C, McDonald, KT, McKeown, RD, Meng, Y, Napolitano, J, Naumov, D, Naumova, E, Nguyen, TMT, Ochoa-Ricoux, JP, Olshevskiy, A, Pan, HR, Park, J, Patton, S, Peng, JC, Pun, CSJ, Qi, FZ, Qi, M, Qian, X, Raper, N, Ren, J, Morales Reveco, C, Rosero, R, Roskovec, B, Ruan, XC, Steiner, H, Sun, JL, Tmej, T, Treskov, K, Tse, WH, Tull, CE, Viren, B, Vorobel, V, Wang, CH, Wang, J, Wang, M, Wang, NY, Wang, RG, Wang, W, Wang, X, Wang, Y, Wang, YF, Wang, Z, Wang, Z, Wang, ZM, Wei, HY, Wei, LH, Wen, LJ, Whisnant, K, White, CG, Wong, HLH, Worcester, E, Wu, DR, Wu, Q, Wu, WJ, Xia, DM, Xie, ZQ, Xing, ZZ, Xu, HK, Xu, JL, Xu, T, Xue, T, Yang, CG, Yang, L, Yang, YZ, Yao, HF, Ye, M, Yeh, M, Young, BL, Yu, HZ, Yu, ZY, Yue, BB, Zavadskyi, V, Zeng, S, Zeng, Y, Zhan, L, Zhang, C, Zhang, FY, Zhang, HH, Zhang, JL, Zhang, JW, Zhang, QM, Zhang, SQ, Zhang, XT, Zhang, YM, Zhang, YX, Zhang, YY, Zhang, ZJ, Zhang, ZP, Zhang, ZY, Zhao, J, Zhao, RZ, Zhou, L, Zhuang, HL & Zou, JH 2022, 'First Measurement of High-Energy Reactor Antineutrinos at Daya Bay', Physical Review Letters, 卷 129, 編號 4, 041801. https://doi.org/10.1103/PhysRevLett.129.041801

TY - JOUR

T1 - First Measurement of High-Energy Reactor Antineutrinos at Daya Bay

AU - An, F. P.

AU - Bai, W. D.

AU - Balantekin, A. B.

AU - Bishai, M.

AU - Blyth, S.

AU - Cao, G. F.

AU - Cao, J.

AU - Chang, J. F.

AU - Chang, Y.

AU - Chen, H. S.

AU - Chen, H. Y.

AU - Chen, S. M.

AU - Chen, Y.

AU - Chen, Y. X.

AU - Cheng, J.

AU - Cheng, Z. K.

AU - Cherwinka, J. J.

AU - Chu, M. C.

AU - Cummings, J. P.

AU - Dalager, O.

AU - Deng, F. S.

AU - Ding, Y. Y.

AU - Diwan, M. V.

AU - Dohnal, T.

AU - Dolzhikov, D.

AU - Dove, J.

AU - Dwyer, D. A.

AU - Gallo, J. P.

AU - Gonchar, M.

AU - Gong, G. H.

AU - Gong, H.

AU - Gu, W. Q.

AU - Guo, J. Y.

AU - Guo, L.

AU - Guo, X. H.

AU - Guo, Y. H.

AU - Guo, Z.

AU - Hackenburg, R. W.

AU - Hans, S.

AU - He, M.

AU - Heeger, K. M.

AU - Heng, Y. K.

AU - Hor, Y. K.

AU - Hsiung, Y. B.

AU - Hu, B. Z.

AU - Hu, J. R.

AU - Hu, T.

AU - Hu, Z. J.

AU - Huang, H. X.

AU - Huang, J. H.

AU - Huang, X. T.

AU - Huang, Y. B.

AU - Huber, P.

AU - Jaffe, D. E.

AU - Jen, K. L.

AU - Ji, X. L.

AU - Ji, X. P.

AU - Johnson, R. A.

AU - Jones, D.

AU - Kang, L.

AU - Kettell, S. H.

AU - Kohn, S.

AU - Kramer, M.

AU - Langford, T. J.

AU - Lee, J.

AU - Lee, J. H.C.

AU - Lei, R. T.

AU - Leitner, R.

AU - Leung, J. K.C.

AU - Li, F.

AU - Li, H. L.

AU - Li, J. J.

AU - Li, Q. J.

AU - Li, R. H.

AU - Li, S.

AU - Li, S. C.

AU - Li, W. D.

AU - Li, X. N.

AU - Li, X. Q.

AU - Li, Y. F.

AU - Li, Z. B.

AU - Liang, H.

AU - Lin, C. J.

AU - Lin, G. L.

AU - Lin, S.

AU - Ling, J. J.

AU - Link, J. M.

AU - Littenberg, L.

AU - Littlejohn, B. R.

AU - Liu, J. C.

AU - Liu, J. L.

AU - Liu, J. X.

AU - Lu, C.

AU - Lu, H. Q.

AU - Luk, K. B.

AU - Ma, B. Z.

AU - Ma, X. B.

AU - Ma, X. Y.

AU - Ma, Y. Q.

AU - Mandujano, R. C.

AU - Marshall, C.

AU - McDonald, K. T.

AU - McKeown, R. D.

AU - Meng, Y.

AU - Napolitano, J.

AU - Naumov, D.

AU - Naumova, E.

AU - Nguyen, T. M.T.

AU - Ochoa-Ricoux, J. P.

AU - Olshevskiy, A.

AU - Pan, H. R.

AU - Park, J.

AU - Patton, S.

AU - Peng, J. C.

AU - Pun, C. S.J.

AU - Qi, F. Z.

AU - Qi, M.

AU - Qian, X.

AU - Raper, N.

AU - Ren, J.

AU - Morales Reveco, C.

AU - Rosero, R.

AU - Roskovec, B.

AU - Ruan, X. C.

AU - Steiner, H.

AU - Sun, J. L.

AU - Tmej, T.

AU - Treskov, K.

AU - Tse, W. H.

AU - Tull, C. E.

AU - Viren, B.

AU - Vorobel, V.

AU - Wang, C. H.

AU - Wang, J.

AU - Wang, M.

AU - Wang, N. Y.

AU - Wang, R. G.

AU - Wang, W.

AU - Wang, X.

AU - Wang, Y.

AU - Wang, Y. F.

AU - Wang, Z.

AU - Wang, Z. M.

AU - Wei, H. Y.

AU - Wei, L. H.

AU - Wen, L. J.

AU - Whisnant, K.

AU - White, C. G.

AU - Wong, H. L.H.

AU - Worcester, E.

AU - Wu, D. R.

AU - Wu, Q.

AU - Wu, W. J.

AU - Xia, D. M.

AU - Xie, Z. Q.

AU - Xing, Z. Z.

AU - Xu, H. K.

AU - Xu, J. L.

AU - Xu, T.

AU - Xue, T.

AU - Yang, C. G.

AU - Yang, L.

AU - Yang, Y. Z.

AU - Yao, H. F.

AU - Ye, M.

AU - Yeh, M.

AU - Young, B. L.

AU - Yu, H. Z.

AU - Yu, Z. Y.

AU - Yue, B. B.

AU - Zavadskyi, V.

AU - Zeng, S.

AU - Zeng, Y.

AU - Zhan, L.

AU - Zhang, C.

AU - Zhang, F. Y.

AU - Zhang, H. H.

AU - Zhang, J. L.

AU - Zhang, J. W.

AU - Zhang, Q. M.

AU - Zhang, S. Q.

AU - Zhang, X. T.

AU - Zhang, Y. M.

AU - Zhang, Y. X.

AU - Zhang, Y. Y.

AU - Zhang, Z. J.

AU - Zhang, Z. P.

AU - Zhang, Z. Y.

AU - Zhao, J.

AU - Zhao, R. Z.

AU - Zhou, L.

AU - Zhuang, H. L.

AU - Zou, J. H.

PY - 2022/7/22

Y1 - 2022/7/22

N2 - This Letter reports the first measurement of high-energy reactor antineutrinos at Daya Bay, with nearly 9000 inverse beta decay candidates in the prompt energy region of 8-12 MeV observed over 1958 days of data collection. A multivariate analysis is used to separate 2500 signal events from background statistically. The hypothesis of no reactor antineutrinos with neutrino energy above 10 MeV is rejected with a significance of 6.2 standard deviations. A 29% antineutrino flux deficit in the prompt energy region of 8-11 MeV is observed compared to a recent model prediction. We provide the unfolded antineutrino spectrum above 7 MeV as a data-based reference for other experiments. This result provides the first direct observation of the production of antineutrinos from several high-Qβ isotopes in commercial reactors.

AB - This Letter reports the first measurement of high-energy reactor antineutrinos at Daya Bay, with nearly 9000 inverse beta decay candidates in the prompt energy region of 8-12 MeV observed over 1958 days of data collection. A multivariate analysis is used to separate 2500 signal events from background statistically. The hypothesis of no reactor antineutrinos with neutrino energy above 10 MeV is rejected with a significance of 6.2 standard deviations. A 29% antineutrino flux deficit in the prompt energy region of 8-11 MeV is observed compared to a recent model prediction. We provide the unfolded antineutrino spectrum above 7 MeV as a data-based reference for other experiments. This result provides the first direct observation of the production of antineutrinos from several high-Qβ isotopes in commercial reactors.

UR - http://www.scopus.com/inward/record.url?scp=85135551013&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.129.041801

DO - 10.1103/PhysRevLett.129.041801

M3 - Article

C2 - 35939015

AN - SCOPUS:85135551013

SN - 0031-9007

VL - 129

JO - Physical Review Letters

JF - Physical Review Letters

IS - 4

M1 - 041801

ER -

First Measurement of High-Energy Reactor Antineutrinos at Daya Bay

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