Abstract
The Enriched Xenon Observatory (EXO) experiment will search for neutrinoless double beta decay of 136Xe. The EXO Collaboration is actively pursuing both liquid‐phase and gas‐phase Xe detector technologies with scalability to the ton‐scale. The search for neutrinoless double beta decay of 136Xe is especially attractive because of the possibility of tagging the resulting Ba daughter ion, eliminating all sources of background other than the two neutrino decay mode. EXO‐200, the first phase of the project, is a liquid Xe time projection chamber with 200 kg of Xe enriched to 80% in 136Xe. EXO‐200, which does not include Ba‐tagging, will begin taking data in 2009, with two‐year sensitivity to the half‐life for neutrinoless double beta decay of 6.4×1025 years. This corresponds to an effective Majorana neutrino mass of 0.13 to 0.19 eV.
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