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T: Fachverband Teilchenphysik

T 97: Experimental techniques in astroparticle physics IV

T 97.10: Vortrag

Donnerstag, 18. März 2021, 18:15–18:30, Tv

Background Rejection with the Liquid Argon Instrumentation of LEGEND-200 — •Patrick Krause¹, Maria Fomina², Konstantin Gusev², Jozsef Janiscko-Csathy^1,3, Stefan Schönert¹, Mario Schwarz¹, Egor Shevchik², and Christoph Wiesinger¹ — ¹Physik-Department, Technische Universität München, Garching — ²Joint Institute for Nuclear Research, Dubna, Russia — ³now at Semilab Semiconductor Physics Laboratory Co. Ltd., Budapest, Hungary

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, targets a discovery potential of 10²⁷ years by aiming at a background index of 2 · 10⁻⁴ cts/(keV·kg·yr). Based on the success in GERDA a liquid argon (LAr) detector system will be deployed. It will offer secondary event information which will allow the identification of background events. The system utilizes the property of LAr 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 at the end of optical fibers. The design of the LEGEND-200 LAr instrumentation will be presented and discussed with special emphasis on what was learned from the GERDA LAr instrumentation. This work has been supported in part by the BMBF Verbundforschung (05A20WO2).