Speaker
Description
LEGEND-1000 is a next-generation experiment designed to search for the neutrinoless double-beta (0νββ) decay. The observation of 0νββ decay of $^{76}$Ge isotope would establish the Majorana nature of neutrinos, providing insight into the mechanism of neutrino mass generation and the matter-antimatter asymmetry of the universe.
To achieve an unprecedented discovery sensitivity to 0νββ half-lives beyond $10^{28}$ years, the LEGEND Collaboration will deploy 1000 kg of high-purity germanium detectors enriched to over 90% in $^{76}$Ge, operated in an instrumented liquid argon active shield at a deep underground facility, with a reference design at Laboratori Nazionali del Gran Sasso in Italy. The experiment will probe an effective Majorana neutrino mass in the range of 9–24 meV, covering the inverted neutrino mass ordering. LEGEND-1000 builds on technologies from GERDA, the Majorana Demonstrator, and the ongoing LEGEND-200 deployment, incorporating innovations such as pulse shape analysis, multi-detector segmentation, and LAr scintillation detection. These techniques enable exceptional background suppression, with a targeted rate below 1 × $10^{-5}$ cts/(keV·kg·yr), enabling a quasi-background-free search where even a few observed events could establish discovery.
| Secondary track | T09 - Beyond the Standard Model |
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