Prof. Giuliana Fiorillo (Universita degli studi di Napoli "Federico II" and INFN Napoli)
The DarkSide-50 dark matter detector is a two-phase argon TPC installed at Laboratori Nazionali del Gran Sasso at the center of two nested veto detectors, a 30-tonne liquid scintillator neutron veto and a 1,000-tonne water Cherenkov muon veto. While operating in 2014 with a fill of argon extracted from the atmosphere, DarkSide-50 demonstrated its capability to operate in a background-free mode even in presence of the strong radioactive background due to the 39Ar isotope. Today DarkSide-50 is the only noble liquid dark matter detector operating in background-free mode. In 2015 DarkSide was filled with 150 kg of argon extracted from deep underground reservoirs, allowing DarkSide-50 to make the most sensitive measurement of the 39Ar activity in underground argon. This underground argon was then used to set the strongest WIMP dark matter limit using liquid argon, to date. Overviews of the DarkSide program and of the recent results from DarkSide-50 will be presented, as well as plans for next a generation dual-phase liquid argon TPC.