Karlsruhe 2024 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 34: Neutrino physics 5
T 34.8: Vortrag
Dienstag, 5. März 2024, 17:45–18:00, Geb. 30.22: Gaede-HS
Search for Ge77(m) in LEGEND-200 — •Marie Pruckner, Moritz Neuberger, and Stefan Schönert for the LEGEND collaboration — Physik-Department E15 Technische Universität München James-Franck-Straße 85748 Garching
The delayed decay of 77(m)Ge (Qβ = 2.7 MeV), produced by muon-induced neutron capture on 76Ge, has been identified as the dominant in-situ cosmogenic background contributor for the neutrinoless double-beta decay search with 76Ge (Qββ = 2.039 MeV) in the future LEGEND-1000 experiment at LNGS [1,2,3]. To verify its background contribution estimates, we search for for 77(m)Ge decays in the ongoing LEGEND-200 experiment and compare them with simulation estimates. In this talk, we will demonstrate how we attempt to identify the 77(m)Ge decays using delayed coincidence techniques that require new digital signal processing routines to reconstruct all relevant physics parameters.
We acknowledge support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy - EXC 2094 - 390783311 and through the Sonderforschungsbereich (Collaborative Research Center) SFB1258 ’Neutrinos and Dark Matter in Astro- and Particle Physics’. We acknowledge support by the BMBF Verbundprojekt 05A2023 - LEGEND: Suche nach dem neutrinolosen doppelten Beta-Zerfall in 76Ge mit LEGEND.
[1] C. Wiesinger et al., Eur. Phys. J. C (2018) 78: 597
[2] LEGEND-1000 pCDR, arXiv 2107.11462
[3] M. Neuberger et al., 2021 J. Phys.: Conf. Ser. 2156 012216
Keywords: Neutrinoloser Doppelbetazerfall; Kosmogener Hintergrund; LEGEND