Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 102: Neutrino Physics IX

T 102.3: Vortrag

Freitag, 4. April 2025, 09:30–09:45, VG 3.104

The Liquid Argon Instrumentation of LEGEND-200: Background Rejection Performance — •Rosanna Deckert for the LEGEND collaboration — Technical University of Munich, Garching, Germany

LEGEND-200 is an experiment designed to search for neutrinoless double beta decay of Ge-76. Located deep underground at LNGS, it operates up to 200 kg of enriched high-purity germanium detectors in a liquid argon (LAr) cryostat. To achieve ultra-low backgrounds, the LAr is instrumented as an active volume to detect scintillation light emitted upon interactions with ionizing radiation, thus tagging and rejecting backgrounds. To provide insight into the rejection capability at different origins of scintillation light generation, we require proper modeling of light propagation throughout the experimental setup, from any origin in the LAr volume to its eventual detection by the light read-out system. The optical model must be tuned on special calibration data to match the observed photo electron yield. In this contribution, I will present a first analysis of special calibration runs that were performed to benchmark the optical simulations. Additionally, I will discuss the rejection performance of the LAr instrumentation in physics data.

This research is supported by the BMBF through the Verbundforschung 05A20WO2 and by the DFG through the Excellence Cluster ORIGINS and the SFB1258.

Keywords: Neutrinoless double beta decay; High purity germanium detector; Liquid Argon; Underground physics