Chooz and Perry: New Experiments for Long Baseline Reactor Neutrino Oscillations

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We discuss the Chooz experiment, a long baseline search for neutrino vacuum oscillations, which will utilize a large gadolinium-loaded liquid scintillation detector one km from a large nuclear power station in France. The 300-meter (water equivalent) underground site of the detector reduces cosmic ray muons, the main source of background in this type of experiment, by a factor of 300, thereby allowing clean detection of antineutrinos from the reactor. The experimental goal is to probe Δm² values down to 1E-3 eV² for large values of sin² 2θand mixing angles to 0.08 for favorable regions of Δm². A subsequent experiment which will have a 13 km baseline at the former IMB site in Ohio and which can reach Δm² = 8E-5 eV² is also briefly described.