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An, F. P.; Balantekin, A. B.; Bishai, M.; Blyth, S.; Cao, J.; Chang, J. F.; Chang, L. C.; Chang, Y.; Chen, H. S.; Chen, Y. X.; Chen, Y.; Cheng, J.; Cheng, Z. K.; Cherwinka, J. J.; Chu, M. C.; de Arcos, J.; Deng, Z. Y.; Ding, X. F.; Ding, Y. Y.; Diwan, M. V.; Dolgareva, M.; Edwards, W. R.; Gong, G. H.; Gong, H.; Grassi, M.; Guo, L.; Hackenburg, R. W.; Hsiung, Y. B.; Hu, B. Z.; Huang, E. C.; Huang, X. T.; Huber, P.; Ji, X. P.; Kohn, S.; Kwok, T.; Langford, T. J.; Lei, R. T.; Li, D. J.; Li, F.; Li, G. S.; Li, S.; Li, W. D.; Li, X. N.; Li, Y. F.; Li, Z. B.; Lin, C. J.; Lin, Y.-C.; Link, J. M.; Liu, D. W.; Liu, J. C.; Loh, C. W.; Lu, H. Q.; Luk, K. B.; Ma, X. Y.; Ma, X. B.; Malyshkin, Y.; Mooney, M.; Nakajima, Y.; Napolitano, J.; Naumova, E.; Ngai, H. Y.; Pan, H.-R.; Park, J.; Qian, X.; Rosero, R.; Roskovec, B.; Sun, G. X.; Tsang, K. V.; Viaux, N.; Viren, B.; Vorobel, V.; Wang, M.; Wang, N. Y.; Wang, R. G.; Wang, W.; Wang, Y. F.; Wang, Z. M.; Wei, H. Y.; Wen, L. J.; White, C. G.; Whitehead, L.; Wong, H. L. H.; Wong, S. C. F.; Wu, C.-H.; Wu, W. J.; Xia, D. M.; Xia, J. K.; Xu, Y.; Ye, M.; Young, B. L.; Zhang, C.; Zhang, H. H.; Zhang, X. T.; Zhang, Y. M.; Zhang, Y. X.; Zhao, Q. W.; Zhao, Y. B.; Zhong, W. L.; Zhou, N.; Zou, J. H.
Physical review. D, 04/2017, Volume: 95, Issue: 7Journal Article
A measurement of electron antineutrino oscillation by the Daya Bay Reactor Neutrino Experiment is described in detail. Six 2.9-GWth nuclear power reactors of the Daya Bay and Ling Ao nuclear power facilities served as intense sources of ν¯e’s. Comparison of the ν¯e rate and energy spectrum measured by antineutrino detectors far from the nuclear reactors (∼1500–1950 m) relative to detectors near the reactors (∼350–600 m) allowed a precise measurement of ν¯e disappearance. More than 2.5 million ν¯e inverse beta-decay interactions were observed, based on the combination of 217 days of operation of six antineutrino detectors (December, 2011–July, 2012) with a subsequent 1013 days using the complete configuration of eight detectors (October, 2012–July, 2015). The ν¯e rate observed at the far detectors relative to the near detectors showed a significant deficit, R=0.949±0.002(stat)±0.002(syst). The energy dependence of ν¯e disappearance showed the distinct variation predicted by neutrino oscillation. Analysis using an approximation for the three-flavor oscillation probability yielded the flavor-mixing angle sin22θ13=0.0841±0.0027(stat)±0.0019(syst) and the effective neutrino mass-squared difference of |Δmee2|=(2.50±0.06(stat)±0.06(syst))×10−3 eV2. Analysis using the exact three-flavor probability found Δm322=(2.45±0.06(stat)±0.06(syst))×10−3 eV2 assuming the normal neutrino mass hierarchy and Δm322=(−2.56±0.06(stat)±0.06(syst))×10−3 eV2 for the inverted hierarchy.
