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The Improved Measurement of Electron-antineutrino Disappearance at Daya Bay
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With 2.5x the previously reported exposure, the Daya Bay experiment has improved the measurement of the neutrino mixing parameter sin^2(2theta_13) = 0.089+-0.010(stat)+-0.005(syst). Reactor anti-neutrinos were produced by six 2.9 GW(th) commercial power reactors, and measured by six 20-ton target-mass detectors of identical design. A total of 234,217 anti-neutrino candidates were detected in 127 days of exposure. An anti-neutrino rate of 0.944+-0.007(stat)+-0.003(syst) was measured by three detectors at a flux-weighted average distance of 1648 m from the reactors, relative to two detectors at 470 m and one detector at 576 m. Detector design and depth underground limited the background to 5+-0.3% (far detectors) and 2+-0.2% (near detectors) of the candidate signals. The improved precision confirms the initial measurement of reactor anti-neutrino disappearance, and continues to be the most precise measurement of theta_13.
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Cited by 1 Pith paper
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Breaking the Democratic Limit in the Generalized Friedberg-Lee Model: Implications for Neutrino Masses and Mixing
Adding a specially chosen perturbation to the democratic neutrino mass matrix at 'Point D' reproduces the inverted hierarchy, non-zero θ13 and a large CP phase, but those observables are inputs of the construction.
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