The Daya Bay Antineutrino Detector Filling System and Liquid Mass Measurement

Understand

The Daya Bay Reactor Neutrino Experiment has measured the neutrino mixing angle \theta_{13} to world-leading precision.

• The experiment uses eight antineutrino detectors filled with 20-tons of gadolinium-doped liquid scintillator to detect antineutrinos emitted from the Daya Bay nuclear power plant through the inverse beta decay reaction.
• The precision measurement of sin^{2}2\theta_{13} relies on the relative antineutrino interaction rates between detectors at near (400 m) and far (roughly 1.8 km) distances from the nuclear reactors.
• The measured interaction rate in each detector is directly proportional to the number of protons in the liquid scintillator target.