Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 56: Experimental methods III

T 56.8: Talk

Wednesday, April 1, 2020, 18:15–18:30, H-ÜR 1

Background rejection with the Liquid Argon Veto System of LEGEND-200 — •Patrick Krause¹, Maria Fomina², Konstantin Gusev^1,2, Jozsef Janicsko-Csathy³, Oskar Moras¹, Stefan Schönert¹, Mario Schwarz¹, Egor Shevchik², and Christoph Wiesinger¹ — ¹Technische Universität München, Garching, Germany — ²Joint Institute for Nuclear Research, Dubna, Russia — ³Leibniz-Institut für Kristallzüchtung, Berlin, Germany

A discovery that neutrinos are Majorana fermions would have profound implications for particle physics and cosmology. The Majorana character of neutrinos would make possible the neutrinoless double-beta (0nbb) decay, a matter-creating process without the balancing emission of antimatter. The LEGEND Collaboration aims to develop a phased, ⁷⁶Ge-based double-beta decay experimental program with discovery potential at a half-life beyond 10²⁸ years. The first Phase, LEGEND-200, aims for a discovery potential of 10²⁷ years and a background index of 0.6 cts/(ROI t yr). Based on the success in GERDA a liquid argon veto system will be deployed in LEGEND-200 to actively suppress background events. It utilizes the property of liquid argon to scintillate upon the interaction with ionizing radiation. The emitted vacuum ultraviolet light is shifted to the optical spectrum and read out by silicon photomultipliers mounted to the end of optical fibers. This talk will give an insight into the design considerations of the LEGEND-200 liquid argon veto system, driven by the performance of the GERDA liquid argon veto system. This work has been supported in part by the German Federal Ministry for Education and Research.