Karlsruhe 2024 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 33: Neutrino physics 4
T 33.5: Vortrag
Dienstag, 5. März 2024, 17:00–17:15, Geb. 30.21: Gerthsen-HS
Cosmogenic Background Suppression in LEGEND-1000 — •Moritz Neuberger and Stefan Schönert for the LEGEND collaboration — Physik-Department E15, Technische Universität München, James-Franck-Straße, 85748 Garching
The in-situ production of long-lived radioactive isotopes by cosmic muons can generate a non-negligible background for deep underground rare event searches. The delayed decay of 77(m)Ge is the primary in-situ cosmogenic contributor for a neutrinoless double-beta decay search with 76Ge [1]. The upcoming ton-scale LEGEND-1000 experiment requires a total background of <10−5 cts/(keV·kg·yr) [2]. A combination of passive and active background suppression techniques has been developed using Monte Carlso studies, which show a potential reduction of the background contribution approximately 2·10−5 cts/(keV·kg·yr) to 4·10−7 cts/(keV·kg·yr) without significantly decreasing the selection efficiency for neutrinoless double-beta decay [3]. 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’.
[1] C. Wiesinger et al., Eur. Phys. J. C (2018) 78: 597
[2] LEGEND-1000 pCDR, arXiv 2107.11462
[3] M. Neuberger et al., Constraining the 77(m)Ge Production with GERDA Data and Implications for LEGEND-1000, TAUP2023, poster presentation
Keywords: Cosmogenic Background; LEGEND; Delayed coincidence; Muon-induced background; LNGS