LEGEND-1000: A Ton-Scale Search for Neutrinoless Double-Beta Decay in 76Ge

The LEGEND Collaboration

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Abstract

Next-generation neutrinoless double-beta decay searches seek the Majorana nature of neutrinos and the existence of a lepton number violating process. The LEGEND-1000 experiment represents the ton-scale phase of the LEGEND program's search for neutrinoless double-beta decay of 76Ge, following the current intermediate-stage LEGEND-200 experiment at LNGS in Italy. The LEGEND-1000 design is based on a 1000-kg mass of p-type, inverted-coaxial, point-contact germanium detectors operated within a liquid argon active shield. This approach has achieved the lowest background levels and the best energy resolution at the decay Q value as established by the GERDA and MAJORANA DEMONSTRATOR experiments. The LEGEND-1000 experiment's technical design, energy resolution, material selection, and background suppression techniques combine to project a quasi-background-free search for neutrinoless double-beta decay in 76Ge at a half-life beyond 1028 yr and a discovery sensitivity spanning the inverted-ordering neutrino mass scale.

Original languageEnglish
Article number177
JournalProceedings of Science
Volume441
StatePublished - Mar 22 2024
Event18th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2023 - Vienna, Austria
Duration: Aug 28 2023Sep 1 2023

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