Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 53: Neutrino physics 6

T 53.4: Talk

Wednesday, March 6, 2024, 16:45–17:00, Geb. 20.30: 2.058

Particle Identification in Liquid Argon for LEGEND — •Niko Lay for the LEGEND collaboration — Technical University of Munich, Garching, Germany

The LEGEND experiment searches for neutrinoless double beta (0ν β β) decay in ⁷⁶Ge using high-purity germanium detectors immersed in liquid argon (LAr), which acts both as a coolant and active shield from background radiation. Ionizing particles traversing LAr produce, depending on their linear energy transfer, different ratios of argon unstable singlet and metastable triplet state excimers, which emit 128 nm scintillation light upon their decay. By measuring the time structure of the scintillation events, the LEGEND LAr instrumentation can identify background particles. In this talk, we present the event topology classifier (ETC), which is based on the singlet-to-triplet ratio of scintillation events, and its application to support the tagging of ²¹⁴Bi-Po coincidence events. The ETC is used to estimate the ²²²Rn activity in the LEGEND LAr cryostat during commissioning. Finally, we explore the ETC performance of a different experimental setup, the shallow-underground LAr cryostat SCARF at TU-Munich, and investigate discriminating fast scintillation light emitted by polyethylene naphthalate (PEN) from LAr scintillation light. This research is supported by the BMBF through the Verbundforschung 05A20WO2 and the SFB1258.