Improved measurement of electron antineutrino disappearance at Daya Bay
2013
With 2.5× the previously reported exposure, the Daya Bay experiment has improved the measurement of the
neutrino mixing parameter sin^2 2θ_(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 θ_(13).
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