PoS - Proceedings of Science
Volume 441 - XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP2023) - Neutrino Physics and Astrophysics
The LEGEND-200 Liquid Argon Instrumentation: From a simple veto to a full-fledged detector
R. Deckert*, I. Abritta, G. Araujo, L. Baudis, N. Burlac, V. D’Andrea, M. Fomina, K. Gusev, A. Leonhardt, P. Krause, L. Papp, N. Rumyantseva, G. Salamanna, S. Schönert, M. Schwarz, E. Shevchik, D. Tagnani, C. Vogl, D. Zinatulina  on behalf of the LEGEND Collaboration
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Pre-published on: January 30, 2024
Published on: March 22, 2024
LEGEND-200 is an experiment designed to search for neutrinoless double beta decay of $^{76}$Ge by operating up to 200 kg of enriched germanium detectors in liquid argon (LAr). To achieve ultra-low backgrounds, the LAr is instrumented to detect scintillation light emitted upon interactions with ionizing radiation, thus tagging and rejecting backgrounds. The LAr scintillation light is detected with wavelength-shifting fibers coupled to silicon photomultiplier (SiPM) arrays.
In this document, we demonstrate the high photoelectron resolution and low noise level of the SiPM signals. We also present the results of special calibration runs performed to determine the light yield and background suppression factors.
We show the background suppression performance of the LAr instrumentation on the LEGEND-200 background spectrum before and after the LAr light coincidence cut.
Finally, we present the event topology classifier which enables effective particle discrimination, allowing the identification of background types in LEGEND-200.
DOI: https://doi.org/10.22323/1.441.0256
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