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EXO-200 and the Search for Neutrinoless Double-Beta Decay

Not scheduled


Tim Daniels (UNCW)


The detection of neutrinoless double-beta decay (0νββ) would confirm the Majorana nature of neutrinos and shed light on the neutrino mass scale. The EXO-200 experiment employs 110 kg of active xenon enriched to 80.6% in isotope 136 in a liquid-phase time-projection chamber (TPC) in a 0νββ search. Located underground at the Waste Isolation Pilot Plant (WIPP) outside Carlsbad, NM, the experiment collected data in two phases between May 2011 and December 2018. Analysis of the resulting 234.1 kg-yr dataset results in an upper limit on the 0νββ half-life of 3.5 x 10$^{25}$ yr at the 90% confidence level. The sensitivity of this low-background experiment is enhanced by the TPC technique, which exploits the anticorrelation of the ionization and scintillation signals and uses topological information to discriminate between beta-like signal events and gamma-ray backgrounds.


Full-dataset neutrinoless double-beta decay limit from EXO-200.

Experiment/Collaboration EXO-200

Primary author

Presentation Materials