Speaker
Description
The LEGEND project (Large Enriched Germanium Experiment for Neutrinoless ββ Decay) aims to detect neutrinoless double beta decay of 76Ge using enriched high-purity germanium detectors immersed in liquid argon. The LEGEND collaboration is currently operating the LEGEND-200 detector in the Underground Gran Sasso Laboratory (LNGS), instrumented with around 130 kg of germanium detectors immersed in atmospheric liquid argon. A second phase is foreseen and it will operate the LEGEND-1000 detector currently under technical design phase; it will use 1000 kg of enriched high-purity germanium detectors arranged in strings, deployed in underground liquid Argon, depleted in Ar-39. The background Index goal for LEGEND-100 at Qββ is 10^-5 cts/(keV kg yr) and the half-live sensitivity for a discovery of 0νββ of 76Ge is > 10^28 yr after 10 yr live time. This talk will review the background suppression techniques that will be employed to reach this goal. This work is supported by the U.S. DOE, and the NSF, the LANL, ORNL and LBNL LDRD programs; the European ERC and Horizon programs; the German DFG, BMBF, and MPG; the Italian INFN; the Polish NCN and MNiSW; the Czech MEYS; the Slovak RDA; the Swiss SNF; the UK STFC; the Canadian NSERC and CFI; the LNGS and SURF facilities.