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First measurement of high-energy reactor antineutrinos at Daya Bay

Authors :
Daya Bay collaboration
An, F. P.
Balantekin, A. B.
Band, H. R.
Bishai, M.
Blyth, S.
Cao, G. F.
Cao, J.
Chang, J. F.
Chang, Y.
Chen, H. S.
Chen, S. M.
Chen, Y.
Chen, Y. X.
Cheng, J.
Cheng, Z. K.
Cherwinka, J. J.
Chu, M. C.
Cummings, J. P.
Dalager, O.
Deng, F. S.
Ding, Y. Y.
Diwan, M. V.
Dohnal, T.
Dove, J.
Dvorak, M.
Dwyer, D. A.
Gallo, J. P.
Gonchar, M.
Gong, G. H.
Gong, H.
Gu, W. Q.
Guo, J. Y.
Guo, L.
Guo, X. H.
Guo, Y. H.
Guo, Z.
Hackenburg, R. W.
Hans, S.
He, M.
Heeger, K. M.
Heng, Y. K.
Higuera, A.
Hor, Y. K.
Hsiung, Y. B.
Hu, B. Z.
Hu, J. R.
Hu, T.
Hu, Z. J.
Huang, H. X.
Huang, X. T.
Huang, Y. B.
Huber, P.
Jaffe, D. E.
Jen, K. L.
Ji, X. L.
Ji, X. P.
Johnson, R. A.
Jones, D.
Kang, L.
Kettell, S. H.
Kohn, S.
Kramer, M.
Langford, T. J.
Lee, J.
Lee, J. H. C.
Lei, R. T.
Leitner, R.
Leung, J. K. C.
Li, F.
Li, J. J.
Li, Q. J.
Li, S.
Li, S. C.
Li, W. D.
Li, X. N.
Li, X. Q.
Li, Y. F.
Li, Z. B.
Liang, H.
Lin, C. J.
Lin, G. L.
Lin, S.
Ling, J. J.
Link, J. M.
Littenberg, L.
Littlejohn, B. R.
Liu, J. C.
Liu, J. L.
Lu, C.
Lu, H. Q.
Lu, J. S.
Luk, K. B.
Ma, X. B.
Ma, X. Y.
Ma, Y. Q.
Marshall, C.
Caicedo, D. A. Martinez
McDonald, K. T.
McKeown, R. D.
Meng, Y.
Napolitano, J.
Naumov, D.
Naumova, E.
Ochoa-Ricoux, J. P.
Olshevskiy, A.
Pan, H. -R.
Park, J.
Patton, S.
Peng, J. C.
Pun, C. S. J.
Qi, F. Z.
Qi, M.
Qian, X.
Raper, N.
Ren, J.
Reveco, C. Morales
Rosero, R.
Roskovec, B.
Ruan, X. C.
Steiner, H.
Sun, J. L.
Tmej, T.
Treskov, K.
Tse, W. -H.
Tull, C. E.
Viren, B.
Vorobel, V.
Wang, 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. M.
Wei, H. Y.
Wei, L. H.
Wen, L. J.
Whisnant, K.
White, C. G.
Wong, H. L. H.
Worcester, E.
Wu, D. R.
Wu, F. L.
Wu, Q.
Wu, W. J.
Xia, D. M.
Xie, Z. Q.
Xing, Z. Z.
Xu, J. L.
Xu, T.
Xue, T.
Yang, C. G.
Yang, L.
Yang, Y. Z.
Yao, H. F.
Ye, M.
Yeh, M.
Young, B. L.
Yu, H. Z.
Yu, Z. Y.
Yue, B. B.
Zeng, S.
Zeng, Y.
Zhan, L.
Zhang, C.
Zhang, F. Y.
Zhang, H. H.
Zhang, J. W.
Zhang, Q. M.
Zhang, X. T.
Zhang, Y. M.
Zhang, Y. X.
Zhang, Y. Y.
Zhang, Z. J.
Zhang, Z. P.
Zhang, Z. Y.
Zhao, J.
Zhou, L.
Zhuang, H. L.
Zou, J. H.
Source :
Phys. Rev. Lett. 129, 041801 (2022)
Publication Year :
2022

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-$Q_{\beta}$ isotopes in commercial reactors.<br />Comment: 7 pages, 4 figures, accepted by Physical Review Letters

Subjects

Subjects :
High Energy Physics - Experiment
Nuclear Experiment

Details

Database :
arXiv
Journal :
Phys. Rev. Lett. 129, 041801 (2022)
Publication Type :
Report
Accession number :
edsarx.2203.06686
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevLett.129.041801
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