Speaker
Description
The LEGEND experiment is a next-generation search for neutrinoless double-beta decay of Ge-76 with unprecedented sensitivity. Building on the successful technologies and results of GERDA and MAJORANA experiments, LEGEND will probe the inverted neutrino mass ordering.
LEGEND-1000 represents the ultimate phase of the program, targeting an active mass of approximately one tonne of enriched germanium detectors and a discovery sensitivity beyond 10^28 years. It requires an ultra-low background index below 10^-5 counts/(keV·kg·yr) in the ROI. Deployed in the LNSG, Italy, the experiment combines HPGe detectors with excellent energy resolution immersed in liquid argon with scintillation-based active background suppression.
Key innovations for LEGEND-1000 include large-scale production of enriched germanium detectors, the use of underground argon, enhanced background reduction via material screening and clean fabrication, improved pulse-shape discrimination and LAr instrumentation. In this contribution, we present the scientific motivation, experimental design, and current status of LEGEND-1000.
This work is supported by the U.S. DOE and the NSF, the LANL, ORNL, LBNL LDRD programs; the European ERC and Horizon programs; the German DFG, BMBF, MPG; the Italian INFN; the Polish NCN, MNiSW; the Czech MEYS; the Slovak RDA; the Swiss SNF; the UK STFC; the Canadian NSERC, CFI; the LNGS and SURF facilities.
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