The Double Chooz Experiment

There is broad consensus in the worldwide physics community as to the need for a new reactor-neutrino experiment to measure or limit the neutrino mixing angle $\theta_{13}$. The Double Chooz Experiment, planned for operation in the years 2008-2011, will search for values of $\sin^2{2\theta_{13}}$ down to $\approx$0.03. This will be the first new information on $\theta_{13}$ in over a decade and will cover most of the remaining parameter space. A quick and relatively inexpensive project is made possible by the existing neutrino laboratory at the Chooz site.