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An, F P; Chan, Y L; Chang, J F; Chen, S M; Chen, Y X; Cheng, J; Cheng, Z K; Chu, M C; Deng, F S; Diwan, M V; Gonchar, M; Gong, H; Guo, X H; Guo, Z; Hans, S; Higuera, A; Hsiung, Y B; Hu, B Z; Hu, J R; Hu, T; Huo, W; Jaffe, D E; Ji, X P; Jones, D; Koerner, L W; Kramer, M; Lebanowski, L; Lee, J; Lee, J H C; Leitner, R; Leung, J K C; Li, C; Li, H L; Li, Q J; Li, S; Li, S C; Li, S J; Li, X N; Li, Y F; Li, Z B; Lin, C J; Lin, G L; Lin, S; Lin, S K; Lin, Y-C; Littenberg, L; Liu, J C; Liu, J L; Lu, C; Lu, H Q; Ma, X B; Ma, X Y; Ma, Y Q; Martinez Caicedo, D A; McDonald, K T; Mora Lepin, L; Napolitano, J; Naumov, D; Pan, H-R; Park, J; Patton, S; Pec, V; Peng, J C; Pinsky, L; Qi, M; Roskovec, B; Ruan, X C; Steiner, H; Sun, J L; Taychenachev, D; Wang, W; Wang, W; Wang, X; Wang, Y F; Wang, Z; Wang, Z; Wang, Z M; Wei, H Y; Wen, L J; White, C G; Wise, T; Wu, W J; Xing, Z Z; Xu, J L; Xue, T; Yang, H; Yang, M S; Yang, M T; Ye, M; Yeh, M; Yu, Z Y; Yue, B B; Zhan, L; Zhang, C; Zhang, H H; Zhang, R; Zhang, X T; Zhang, Y Y; Zhang, Z P; Zou, J H
Physical review letters, 12/2018, Volume: 121, Issue: 24Journal Article
We report a measurement of electron antineutrino oscillation from the Daya Bay Reactor Neutrino Experiment with nearly 4 million reactor νover ¯_{e} inverse β decay candidates observed over 1958 days of data collection. The installation of a flash analog-to-digital converter readout system and a special calibration campaign using different source enclosures reduce uncertainties in the absolute energy calibration to less than 0.5% for visible energies larger than 2 MeV. The uncertainty in the cosmogenic ^{9}Li and ^{8}He background is reduced from 45% to 30% in the near detectors. A detailed investigation of the spent nuclear fuel history improves its uncertainty from 100% to 30%. Analysis of the relative νover ¯_{e} rates and energy spectra among detectors yields sin^{2}2θ_{13}=0.0856±0.0029 and Δm_{32}^{2}=(2.471_{-0.070}^{+0.068})×10^{-3} eV^{2} assuming the normal hierarchy, and Δm_{32}^{2}=-(2.575_{-0.070}^{+0.068})×10^{-3} eV^{2} assuming the inverted hierarchy.
