EXO-200 and R&D prospects

Physics – Medical Physics

Scientific paper

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Double Beta Decay, Neutrino Mass, Exo, Micromegas

Scientific paper

EXO-200 (Enriched Xenon Observatory - 200kg) is an underground double-beta decay experiment that uses 200kg of Xenon isotopically enriched to 80% in Xenon-136. The Xenon is contained in an ultra-low background TPC where there is simultaneous collection of scintillation light (using Large Area Avalanche Photodiodes (LAAPD's)) and ionization charge in order to significantly enhance the energy resolution. EXO-200 should measure the, as yet unobserved, two neutrino double-beta decay mode as well as achieve competitive sensitivity for the neutrinoless double-beta decay mode of Xenon-136. EXO-200 is currently undergoing final construction and commissioning. R&D is being conducted towards the construction of a ton-class detector. A high-resolution micropattern (MicroMegas) readout system is being studied in Bern, Switzerland. The scheme offers full tracking capabilities and 3D event reconstruction for possible application in a future gas-phase EXO detector.

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