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Improved measurement of electron antineutrino disappearance at Daya Bay

Journal Article · · Chinese Physics C, High Energy Physics and Nuclear Physics
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In this paper, we report an improved measurement of the neutrino mixing angle θ13 from the Daya Bay Reactor Neutrino Experiment. We exclude a zero value for sin213 with a significance of 7.7 standard deviations. Electron antineutrinos from six reactors of 2.9 GWth were detected in six antineutrino detectors deployed in two near (flux-weighted baselines of 470 m and 576 m) and one far (1648 m) underground experimental halls. Using 139 days of data, 28909 (205308) electron antineutrino candidates were detected at the far hall (near halls). The ratio of the observed to the expected number of antineutrinos assuming no oscillations at the far hall is 0.944±0.007(stat.)±0.003(syst.). In conclusion, an analysis of the relative rates in six detectors finds sin213=0.089±0.010(stat.)±0.005(syst.) in a three-neutrino framework.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Contributing Organization:
Daya Bay Collaboration
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1407170
Alternate ID(s):
OSTI ID: 1082082
Journal Information:
Chinese Physics C, High Energy Physics and Nuclear Physics, Journal Name: Chinese Physics C, High Energy Physics and Nuclear Physics Journal Issue: 1 Vol. 37; ISSN 1674-1137
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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