THE BUGEY-3 NEUTRINO DETECTOR

The Bugey 3 experiment, designed to measure oscillations of reactor ne utrinos, has used 3 identical detection modules, each of 600 liters, f illed with a new Li-6-loaded liquid scintillator. These modules were l ocated in two shielding bunkers, respectively 15 and 40 m away from th e reactor core. We describe here the mechanical characteristics of the se modules, their shielding, the associated Electronics, the nigger, t he acquisition systems, the calibration and monitoring of these detect ors, and the Monte Carlo simulations of their response to particles. W e conclude on the overall performance of this new detection technique which has allowed the recording of 120000 neutrino interactions with g ood neutron efficiency (49%), low background (2.5 evts/hr) and good en ergy resolution (4% al 4.4 MeV).