Reactor Measurement of $θ_{13}$ and Its Complementarity to Long-Baseline Experiments

A possibility to measure $\sin^22θ_{13}$ using reactor neutrinos is examined in detail. It is shown that the sensitivity $\sin^22θ_{13}>0.02$ can be reached with 20 ton-year data by placing identical CHOOZ-like detectors at near and far distances from a giant nuclear power plant whose total thermal energy is 24.3 ${\text{GW}_{\text{th}}}$. It is emphasized that this measurement is free from the parameter degeneracies which occur in accelerator appearance experiments, and therefore the reactor measurement plays a role complementary to accelerator experiments. It is also shown that the reactor measurement may be able to resolve the degeneracy in $θ_{23}$ if $\sin^22θ_{13}$ and $\cos^22θ_{23}$ are relatively large.

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