The Enriched Xenon Observatory (EXO) Saturday, 11 June 2011 16:20 (20 Minutes)

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The Enriched Xenon Observatory (EXO) Saturday, 11 June 2011 16:20 (20 Minutes)

TIPP 2011 - 2nd International Conference on Technology and Instrumentation in Particle Physics Contribution ID: 96 Type: Oral Presentation The Enriched Xenon Observatory (EXO) Saturday, 11 June 2011 16:20 (20 minutes) The Enriched Xenon Observatory (EXO) is an experimental program designed to search for the neutrinoless double beta decay (0nbb) of Xe-136. Observation of 0nbb would determine an absolute mass scale for neutrinos, prove that neutrinos are massive Majorana particles (indistinguishable from their own antiparticles), and constitute physics beyond the Standard Model. The current phase of the experiment, EXO-200, uses 200kgof liquid xenon with 80% enrichment in Xe-136, and also serves as a prototype for a future 1-10 ton scale EXO experiment. The double beta decay of xenon is detected in an ultra-low background time projection chamber (TPC) by collecting both the scintillation light and the ionization charge. The detector is now operational at the Waste Isolation Pilot Plant (WIPP) in New Mexico. It was first run with natural xenon to fully commission it and study its performance. Preparation for physics data taking is underway. The projected two-year sensi- tivity for neutrinoless double beta decay half-life is 6.4E25 y at 90% confidence level. In view of a future ton scale experiment, the collaboration is performing R&D to realize an ideal, background-free search for which the daughter nucleus produced by the double beta decay is also individually detected. In this talk, the current status and preliminary results from EXO-200 will be presented, and prospects for a ton scale EXO experiment will be discussed. Primary author: NEILSON, Russell (Stanford University) Presenter: NEILSON, Russell (Stanford University) Session Classification: Detector for Neutrinos Track Classification: Detectors for neutrino physics.

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