EXO-200

The Enriched Xenon Observatory (EXO) is a series of experiments designed to search for the neutrinoless double beta decay of Xenon-136. The first EXO experiment, known as EXO-200, is nearing completion. The centerpiece of EXO-200 is a liquid xenon TPC containing 200 kg of xenon enriched to 80% in Xenon-136, making it the largest double beta decay experiment ever attempted. EXO-200 will have a sensitivity to Majorana neutrino masses of ∼150 meV. The cryogenics and fluid handling systems for EXO-200 were commissioned at Stanford University in 2007, and the experiment is currently being installed in its underground location at the WIPP facility in Carlsbad, New Mexico.