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== Design ==
The experiment used high purity enriched [[Germanium|Ge]] crystal [[diodes]] ([[Semiconductor detector#Germanium detector|HPGe]]) as a beta decay source and [[particle detector]]. The detectors from the HdM ([[Heidelberg-Moscow experiment|Heidelberg-Moscow]]<ref name="article2021">https://link.springer.com/article/10.1140/epjc/s10052-021-09403-2</ref>) and [[IGEX]]<ref name="article2021"/> experiments were reprocessed and used in phase 1. The detector array was 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 detected and excluded background [[muons]]. Pulse-shape discrimination (PSD) was applied as a cut to discriminate between particle types.
GERDA followed in the footsteps of other 0νββ experiments using germanium; already more than 50 years ago (that is, around 1970), a 0.1 kg germanium detector was used by a Milano group in the first 0νββ decay search with a germanium detector. Since then, the sensitivity had been increased by a factor of one million.<ref name="gerdafinal"/>
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