New Measurement of Antineutrino Oscillation with the Full Detector Configuration at Daya Bay

We report a new measurement of electron antineutrino disappearance using the fully constructed Daya Bay Reactor Neutrino Experiment. The final two of eight antineutrino detectors were installed in the summer of 2012. Including the 404 days of data collected from October 2012 to November 2013 resulted in a total exposure of 6.9×10⁵ GWₜₕ ton days, a 3.6 times increase over our previous results. Improvements in energy calibration limited variations between detectors to 0.2%. Removal of six ²⁴¹Am-¹³C radioactive calibration sources reduced the background by a factor of 2 for the detectors in the experimental hall furthest from the reactors. Direct prediction of the antineutrino signal in the far detectors based on the measurements in the near detectors explicitly minimized the dependence of the measurement on models of reactor antineutrino emission. The uncertainties in our estimates of sin²2θ₁₃ and |Δmₑₑ²| were halved as a result of these improvements. An analysis of the relative antineutrino rates and energy spectra between detectors gave sin²2θ₁₃=0.084±0.005 and |Δmₑₑ²|=(2.42±0.11)×10⁻³ eV² in the three-neutrino framework.