4-8 September 2023
Africa/Johannesburg timezone
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LEGEND: Background-free hunt for the neutrinoless double-beta decay

7 Sep 2023, 16:20
Meeting Room 2.61 - 2.66

Meeting Room 2.61 - 2.66

Oral Presentations G4


Patrick Krause (Technical University of Munich)


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 ($0\nu\beta\beta$) decay, a matter-creating process without the balancing emission of antimatter, possible. The LEGEND Collaboration pursues a phased, $^{76}$Ge-based double-beta decay experimental program. The first phase, LEGEND-200, deploys up to 200 kg of germanium detectors enriched in $^{76}$Ge. A background index of $2\cdot 10^{-4}$ 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 $0\nu\beta\beta$ decay will be accumulated. It constitutes a quasi-background-free operation of LEGEND-200, enabling a potential discovery of the $0\nu\beta\beta$ decay at a half-life of at least $10^{27}$ years. The second phase, LEGEND-1000, will deploy 1000 kg of enriched germanium and reach a discovery potential above $10^{28}$ years. This talk will portray how LEGEND utilizes high-purity materials, novel sub-detector systems, and sophisticated analysis tools to obtain a quasi-background-free energy spectrum. Furthermore, first results from the currently ongoing data-taking period of LEGEND-200 are presented.

Primary author

Patrick Krause (Technical University of Munich)

Presentation Materials