First measurement of high-energy reactor antineutrinos at Daya Bay
Creators: name: Daya Bay Collaboration
name: An, F. P.
name: Balantekin, A. B.
name: Band, H. R.
name: Bishai, M.
name: Blyth, S.
name: Cao, G. F.
name: Cao, J.
name: Chang, J. F.
name: Chang, Y.
name: Chen, H. S.
name: Chen, S. M.
name: Chen, Y.
name: Chen, Y. X.
name: Cheng, J.
name: Cheng, Z. K.
name: Cherwinka, J. J.
name: Chu, M. C.
name: Cummings, J. P.
name: Dalager, O.
name: Deng, F. S.
name: Ding, Y. Y.
name: Diwan, M. V.
name: Dohnal, T.
name: Dove, J.
name: Dvorak, M.
name: Dwyer, D. A.
name: Gallo, J. P.
name: Gonchar, M.
name: Gong, G. H.
name: Gong, H.
name: Gu, W. Q.
name: Guo, J. Y.
name: Guo, L.
name: Guo, X. H.
name: Guo, Y. H.
name: Guo, Z.
name: Hackenburg, R. W.
name: Hans, S.
name: He, M.
name: Heeger, K. M.
name: Heng, Y. K.
name: Higuera, A.
name: Hor, Y. K.
name: Hsiung, Y. B.
name: Hu, B. Z.
name: Hu, J. R.
name: Hu, T.
name: Hu, Z. J.
name: Huang, H. X.
name: Huang, X. T.
name: Huang, Y. B.
name: Huber, P.
name: Jaffe, D. E.
name: Jen, K. L.
name: Ji, X. L.
name: Ji, X. P.
name: Johnson, R. A.
name: Jones, D.
name: Kang, L.
name: Kettell, S. H.
name: Kohn, S.
name: Kramer, M.
name: Langford, T. J.
name: Lee, J.
name: Lee, J. H. C.
name: Lei, R. T.
name: Leitner, R.
name: Leung, J. K. C.
name: Li, F.
name: Li, J. J.
name: Li, Q. J.
name: Li, S.
name: Li, S. C.
name: Li, W. D.
name: Li, X. N.
name: Li, X. Q.
name: Li, Y. F.
name: Li, Z. B.
name: Liang, H.
name: Lin, C. J.
name: Lin, G. L.
name: Lin, S.
name: Ling, J. J.
name: Link, J. M.
name: Littenberg, L.
name: Littlejohn, B. R.
name: Liu, J. C.
name: Liu, J. L.
name: Lu, C.
name: Lu, H. Q.
name: Lu, J. S.
name: Luk, K. B.
name: Ma, X. B.
name: Ma, X. Y.
name: Ma, Y. Q.
name: Marshall, C.
name: Caicedo, D. A. Martinez
name: McDonald, K. T.
name: McKeown, R. D.
name: Meng, Y.
name: Napolitano, J.
name: Naumov, D.
name: Naumova, E.
name: Ochoa-Ricoux, J. P.
name: Olshevskiy, A.
name: Pan, H. -R.
name: Park, J.
name: Patton, S.
name: Peng, J. C.
name: Pun, C. S. J.
name: Qi, F. Z.
name: Qi, M.
name: Qian, X.
name: Raper, N.
name: Ren, J.
name: Reveco, C. Morales
name: Rosero, R.
name: Roskovec, B.
name: Ruan, X. C.
name: Steiner, H.
name: Sun, J. L.
name: Tmej, T.
name: Treskov, K.
name: Tse, W. -H.
name: Tull, C. E.
name: Viren, B.
name: Vorobel, V.
name: Wang, C. H.
name: Wang, J.
name: Wang, M.
name: Wang, N. Y.
name: Wang, R. G.
name: Wang, W.
name: Wang, W.
name: Wang, X.
name: Wang, Y.
name: Wang, Y. F.
name: Wang, Z.
name: Wang, Z.
name: Wang, Z. M.
name: Wei, H. Y.
name: Wei, L. H.
name: Wen, L. J.
name: Whisnant, K.
name: White, C. G.
name: Wong, H. L. H.
name: Worcester, E.
name: Wu, D. R.
name: Wu, F. L.
name: Wu, Q.
name: Wu, W. J.
name: Xia, D. M.
name: Xie, Z. Q.
name: Xing, Z. Z.
name: Xu, J. L.
name: Xu, T.
name: Xue, T.
name: Yang, C. G.
name: Yang, L.
name: Yang, Y. Z.
name: Yao, H. F.
name: Ye, M.
name: Yeh, M.
name: Young, B. L.
name: Yu, H. Z.
name: Yu, Z. Y.
name: Yue, B. B.
name: Zeng, S.
name: Zeng, Y.
name: Zhan, L.
name: Zhang, C.
name: Zhang, F. Y.
name: Zhang, H. H.
name: Zhang, J. W.
name: Zhang, Q. M.
name: Zhang, X. T.
name: Zhang, Y. M.
name: Zhang, Y. X.
name: Zhang, Y. Y.
name: Zhang, Z. J.
name: Zhang, Z. P.
name: Zhang, Z. Y.
name: Zhao, J.
name: Zhou, L.
name: Zhuang, H. L.
name: Zou, J. H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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-$Q_β$ isotopes in commercial reactors.
description: 7 pages, 4 figures, accepted by Physical Review Letters