A neutrino experiment using the Daya Bay reactor

Neutrino oscillation is the only phenomenon currently known beyond the standard model of particle physics. It proves that the neutrino mass is not null, a conclusion extremely important to particle physics, astrophysics and cosmology. Among the six parameters for describing neutrino oscillations, two are still unknown: the mixing angle θ13 and the CP phase δ. We propose to build an experiment near the Daya Bay nuclear power station to measure the mixing angle sin22θ13 to a precision of 0.01 at 90% confidence level, an improvement of about one order of magnitude over past experiments. This will provide a guideline for the future development of neutrino physics, and in particular for the understanding of the absence of anti－matter in the universe.