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      Neutrino factory

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      Physical Review Special Topics - Accelerators and Beams
      American Physical Society (APS)

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          Review of Particle Physics

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            Observation of electron-antineutrino disappearance at Daya Bay

            The Daya Bay Reactor Neutrino Experiment has measured a non-zero value for the neutrino mixing angle \(\theta_{13}\) with a significance of 5.2 standard deviations. Antineutrinos from six 2.9 GW\(_{\rm th}\) reactors were detected in six antineutrino detectors deployed in two near (flux-weighted baseline 470 m and 576 m) and one far (1648 m) underground experimental halls. With a 43,000 ton-GW_{\rm th}-day livetime exposure in 55 days, 10416 (80376) electron antineutrino candidates were detected at the far hall (near halls). The ratio of the observed to expected number of antineutrinos at the far hall is \(R=0.940\pm 0.011({\rm stat}) \pm 0.004({\rm syst})\). A rate-only analysis finds \(\sin^22\theta_{13}=0.092\pm 0.016({\rm stat})\pm0.005({\rm syst})\) in a three-neutrino framework.
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              Observation of Reactor Electron Antineutrino Disappearance in the RENO Experiment

              The RENO experiment has observed the disappearance of reactor electron antineutrinos, consistent with neutrino oscillations, with a significance of 4.9 standard deviations. Antineutrinos from six 2.8 GW\(_{th}\) reactors at the Yonggwang Nuclear Power Plant in Korea, are detected by two identical detectors located at 294 m and 1383 m, respectively, from the reactor array center. In the 229 day data-taking period between 11 August 2011 and 26 March 2012, the far (near) detector observed 17102 (154088) electron antineutrino candidate events with a background fraction of 5.5% (2.7%). The ratio of observed to expected numbers of antineutrinos in the far detector is \(0.920 \pm 0.009({\rm stat.}) \pm 0.014({\rm syst.})\). From this deficit, we determine \(\sin^2 2 \theta_{13} = 0.113 \pm 0.013({\rm stat.}) \pm 0.019({\rm syst.})\) based on a rate-only analysis.
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                Author and article information

                Journal
                PRABFM
                Physical Review Special Topics - Accelerators and Beams
                Phys. Rev. ST Accel. Beams
                American Physical Society (APS)
                1098-4402
                December 2014
                December 8 2014
                : 17
                : 12
                Article
                10.1103/PhysRevSTAB.17.121002
                43ef3560-7ca8-450b-b0fa-eb6d72da29a9
                © 2014

                http://creativecommons.org/licenses/by/3.0/

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