RENO for neutrino mixing angle

The RENO (Reactor Experiment for Neutrino Oscillation) experiment is under construction to measure the value of the smallest and unknown neutrino mixing angle θ 13 . The experiment will compare the measured fluxes of electron antineutrinos at two detectors located at 290 m and 1.4 km distances from the center of the Yonggwang nuclear reactors in Korea. The detectors are near completion, and data-taking is expected to start in mid 2010. The estimated systematic uncertainty associated with the measurement is less than 0.6%, and the expected statistical error is about 0.3%. With three years of data, the experiment will search for mixing angle values of sin 2 2 θ 13 down to 0.02 in the 90% C.L. limit. In this review, the construction status is presented.