EXO (Enriched Xenon Observatory) Research Project

http://www-project.slac.stanford.edu/exo/about.html
Waste Isolation Pilot Plant (WIPP), Carlsbad, NM
Liang Yang (EXO Co-Spokesperson)

EXORecent observations of tiny neutrino masses in solar, atmospheric, and reactor neutrino data raised several intriguing questions. Why are neutrinos so much lighter than the other particles? What is the absolute scale of the neutrino mass spectrum? And is the neutrino its own anti-particle, i.e. a Majorana particle? These questions are best addressed by searching for neutrinoless double beta decay, an exotic nuclear process which can shed light on both the absolute scale of the neutrino mass spectrum, and on the underlying mechanism responsible for the tiny masses that we observe in nature.

The Enriched Xenon Observatory (EXO) is an experimental program designed to search for the neutrinoless double beta decay of Xe-136. The current phase of the experiment, EXO-200, uses 200 kg of liquid xenon with 80% enrichment in Xe-136, and also serves as a prototype for a proposed tonne-scale experiment, named nEXO. The detector began taking low background physics data with enriched xenon at Waste Isolation Pilot Plant (WIPP) in New Mexico in early May 2011. Since then, the collaboration has reported the first observation of the two-neutrino double beta decay in 136 Xe and a neutrinoless double beta decay search result which sets the most stringent limit on the effective Majorana masses (140-380 meV, depending on the matrix element calculation). At UIUC, we are working on EXO-200 electronics upgrade, EXO-200 data analysis and R&D projects for nEXO.

EXO Interview


EXO-200 fabrication

EXO-200
EXO-200

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EXO-200
EXO-200

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EXO-200
EXO-200

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Forming shop
EXO-200

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barn collage
EXO-200

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barn collage
EXO-200

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EXO-200

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