A new measurement of antineutrino oscillation with the full detector configuration at Daya Bay

Abstract

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$\times$10${}^5$ GW${}_{\mathrm{th}}$-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 ${}^{241}$Am-${}^{13}$C radioactive calibration sources reduced the background by a factor of two 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 ${\sin }^{2}2{\theta }_{13}$ and $|\Delta m_{ee}^2|$ were halved as a result of these improvements. Analysis of the relative antineutrino rates and energy spectra between detectors gave ${\sin }^{2}2{\theta }_{13}=0.084\pm 0.005$ and $|\Delta m_{ee}^2|=(2.42\pm 0.11)\times 10^{-3}$ eV${}^2$ in the three-neutrino framework.

Updated to match final published version

References in corpus (7)

• Observation of electron-antineutrino disappearance at Daya Bay
• Improved Measurement of Electron Antineutrino Disappearance at Daya Bay
• Improved measurements of the neutrino mixing angle ${\theta }_{13}$ with the Double Chooz detector
• A side-by-side comparison of Daya Bay antineutrino detectors
• Spectral Structure of Electron Antineutrinos from Nuclear Reactors
• Independent Measurement of Theta13 via Neutron Capture on Hydrogen at Daya Bay
• Neutron Calibration Sources in the Daya Bay Experiment

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