We report an improved measurement of the neutrino mixing angle θ_(13) from the Daya Bay Reactor Neutrino Experiment. We exclude a zero value for sin~2 θ_(13) with a significance of 7.7 standard deviations. Electron antineutrinos from six reactors of 2.9 GW_(th) were detected in six antineutrino dete...
Supported by the Ministry of Science and Technology of China
; the United States Department of Energy
; the Chinese Academy of Sciences
; the National Natural Science Foundation of China
; the Guangdong provincial government
; the Shenzhen municipal government
; the China Guangdong Nuclear Pow...