Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 8: Neutrino physics 2
T 8.1: Talk
Monday, March 4, 2024, 16:00–16:15, Geb. 30.22: Gaede-HS
LEGEND: Background-free hunt for the neutrinoless double-beta decay — •Patrick Krause for the LEGEND collaboration — Department of Physics, TUM School of Natural Sciences, Technische Universität München, 85748 Garching b. München
The discovery that neutrinos are Majorana fermions would have profound implications for particle physics and cosmology. The Majorana character of neutrinos would make neutrinoless double-beta (0νββ) decay, a matter-creating process without the balancing emission of antimatter, possible. The LEGEND Collaboration pursues a phased, 76Ge-based double-beta decay experimental program. The first phase, LEGEND-200, deploys up to 200 kg of germanium detectors enriched in 76Ge. A background index of 2· 10−4 counts/(keV kg yr) will be achieved. With that background index, when integrated over the exposure, less than one background event in the region around the expected peak position of the 0νββ decay will be accumulated. It constitutes a quasi-background-free operation of LEGEND-200, enabling a potential discovery of the 0νββ decay at a half-life of at least 1027 years. The second phase, LEGEND-1000, will deploy 1000 kg of enriched germanium and reach a discovery potential above 1028 years. This talk will portray the LEGEND project and its goals. Furthermore, first results from the currently ongoing data-taking period of LEGEND-200 are presented.
This research is supported by the DFG through the Excellence Cluster ORIGINS EXC 2094-390783311, the SFB1258, and by the BMBF Verbundprojekt 05A2023.
Keywords: LEGEND