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.
| Original language | English |
|---|---|
| Article number | 013002 |
| Journal | Chinese Physics C |
| Volume | 41 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1 Jan 2017 |
Keywords
- Daya Bay
- antineutrino flux
- energy spectrum
- reactor
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Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay. / 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.; Cheng, J.; Cheng, Y. P.; Cheng, Z. K.; Cherwinka, J. J.; Chu, M. C.; Chukanov, A.; Cummings, J. P.; De Arcos, J.; Deng, Z. Y.; Ding, X. F.; Ding, Y. Y.; Diwan, M. V.; Dolgareva, M.; Dove, J.; Dwyer, D. A.; Edwards, W. R.; Gill, R.; Gonchar, M.; Gong, G. H.; Gong, H.; Grassi, M.; Gu, W. Q.; Guan, M. Y.; Guo, L.; Guo, R. P.; Guo, X. H.; Guo, Z.; Hackenburg, R. W.; Han, R.; Hans, S.; He, M.; Heeger, K. M.; Heng, Y. K.; Higuera, A.; Hor, Y. K.; Hsiung, Y. B.; Hu, B. Z.; Hu, T.; Hu, W.; Huang, E. C.; Huang, H. X.; Huang, X. T.; Huber, P.; Huo, W.; Hussain, G.; Jaffe, D. E.; Jaffke, P.; Jen, K. L.; Jetter, S.; Ji, X. P.; Ji, X. L.; Jiao, J. B.; Johnson, R. A.; Jones, D.; Joshi, J.; Kang, L.; Kettell, S. H.; Kohn, S.; Kramer, M.; Kwan, K. K.; Kwok, M. W.; Kwok, T.; Langford, T. J.; Lau, K.; Lebanowski, L.; Lee, J.; Lee, J. H.C.; Lei, R. T.; Leitner, R.; Li, 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.; Liang, H.; Lin, C. J.; Lin, Guey-Lin; Lin, S.; Lin, S. K.; Lin, Y. C.; Ling, J. J.; Link, J. M.; Littenberg, L.; Littlejohn, B. R.; Liu, D. W.; Liu, J. L.; Liu, J. C.; Loh, C. W.; Lu, C.; Lu, H. Q.; Lu, J. S.; Luk, K. B.; Lv, Z.; Ma, Q. M.; Ma, X. Y.; Ma, X. B.; Ma, Y. Q.; Malyshkin, Y.; Martinez Caicedo, D. A.; McDonald, K. T.; McKeown, R. D.; Mitchell, I.; Mooney, M.; Nakajima, Y.; Napolitano, J.; Naumov, D.; Naumova, E.; Ngai, H. Y.; Ning, Z.; Ochoa-Ricoux, J. P.; Olshevskiy, A.; Pan, H. R.; Park, J.; Patton, S.; Pec, V.; Peng, J. C.; Pinsky, L.; Pun, C. S.J.; Qi, F. Z.; Qi, M.; Qian, X.; Raper, N.; Ren, J.; Rosero, R.; Roskovec, B.; Ruan, X. C.; Steiner, H.; Sun, G. X.; Sun, J. L.; Tang, W.; Taychenachev, D.; Treskov, K.; Tsang, K. V.; Tull, C. E.; Viaux, N.; Viren, B.; Vorobel, V.; Wang, C. H.; Wang, M.; Wang, N. Y.; Wang, R. G.; Wang, W.; Wang, X.; Wang, Y. F.; Wang, Z.; Wang, Z.; Wang, Z. M.; Wei, H. Y.; Wen, L. J.; Whisnant, K.; White, C. G.; Whitehead, L.; Wise, T.; Wong, H. L.H.; Wong, S. C.F.; Worcester, E.; Wu, C. H.; Wu, Q.; Wu, W. J.; Xia, D. M.; Xia, J. K.; Xing, Z. Z.; Xu, J. Y.; Xu, J. L.; Xu, Y.; Xue, T.; Yang, C. G.; Yang, H.; Yang, L.; Yang, M. S.; Yang, M. T.; Ye, M.; Ye, Z.; Yeh, M.; Young, B. L.; Yu, Z. Y.; Zeng, S.; Zhan, L.; Zhang, 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.; Zhao, J.; Zhao, Q. W.; Zhao, Y. B.; Zhong, W. L.; Zhou, L.; Zhou, N.; Zhuang, H. L.; Zou, J. H.
In: Chinese Physics C, Vol. 41, No. 1, 013002, 01.01.2017.Research output: Contribution to journal › Article › peer-review
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, Guey-Lin
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.
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.
PY - 2017/1/1
Y1 - 2017/1/1
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
U2 - 10.1088/1674-1137/41/1/013002
DO - 10.1088/1674-1137/41/1/013002
M3 - Article
AN - SCOPUS:85010403976
VL - 41
JO - Chinese Physics C
JF - Chinese Physics C
SN - 1674-1137
IS - 1
M1 - 013002
ER -