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The LEGEND-200 Liquid Argon Instrumentation: From a simple veto to a full-fledged detector


Deckert, Rosanna; Abritta, Igor; Araujo, Gabriela; Baudis, Laura; Burlac, Nina; D’Andrea, Valerio; Fomina, Maria; Gusev, Konstantin; Leonhardt, Andreas; Krause, Patrick; Papp, Laszlo; Rumyantseva, Nadya; Salamanna, Giuseppe; Schönert, Stefan; Schwarz, Mario; Shevchik, Egor; Tagnani, Diego; Vogl, Christoph; Zinatulina, Daniya (2024). The LEGEND-200 Liquid Argon Instrumentation: From a simple veto to a full-fledged detector. In: XVIII International Conference on Topics in Astroparticle and Underground Physics, University of Vienna, 28 August 2023 - 1 September 2023, Sissa.

Abstract

LEGEND-200 is an experiment designed to search for neutrinoless double beta decay of 76Ge 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.

Abstract

LEGEND-200 is an experiment designed to search for neutrinoless double beta decay of 76Ge 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.

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Item Type:Conference or Workshop Item (Paper), not_refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Event End Date:1 September 2023
Deposited On:17 Feb 2024 18:06
Last Modified:21 May 2024 20:44
Publisher:Sissa
Series Name:Proceedings of science
ISSN:1824-8039
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.22323/1.441.0256
  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)