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{{Underlinked|date=December 2014}}
The GERmanium Detector Array ('''GERDA''') experiment is searching for [[neutrinoless double beta decay]](0vββ) in Ge-76 at the underground [[Laboratori Nazionali del Gran Sasso]] (LNGS). [[Neutrinoless beta decay]] is expected to be a very rare process if possible. The collocation predicts less than one event each year per kilogram of material. Background shielding is required to detect any rare decays.
The experiment uses high purity enriched [[Germanium|Ge]] crystal [[diodes]] as a decay source and [[particle detector]]. The detectors from the HdM and Igex experiments were reprocessed and used in GERDA. The detector array is suspended in a [[liquid argon]] [[cryostat]] lined with copper and surrounded by an ultra-pure water tank. [[Photomultiplier|PMTs]] in the water tank and plastic [[scintillators]] above detect and exclude background [[muons]].
== Results ==
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Phase I collected data November 2011 to May 2013, with 21.6 kg·yr exposure, obtaining a 0vββ 90% CL half-life limit:
<math>T_{0 \nu \beta \beta} > 2.1*10^{21} yr </math>. This limit can be combined with previous results,
Phase II will have additional enriched Ge detectors and reduced background.
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