Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 78: Experimental Techniques in Astroparticle Physics 3

T 78.4: Vortrag

Mittwoch, 23. März 2022, 17:00–17:15, T-H37

Scintillation and optical properties of xenon-doped liquid argon — •Christoph Vogl, Mario Schwarz, Xaver Stribl, Johanna Grießing, Patrick Krause, and Stefan Schönert — Chair for Astroparticle Physics, Department of Physics, Technical University Munich, Garching, Germany

Liquid argon (LAr) is widely employed as a scintillator in rare-event searches. Its optical and scintillation properties, as well as the impact of impurities, are being studied extensively by many groups world-wide. LAr scintillation light exhibits a main emission wavelength of 128 nm, which makes propagation and detection challenging because of short attenuation lengths and low quantum efficiencies of photo sensors in the VUV spectral range. The addition of small amounts of xenon to LAr shifts the emission wavelength towards 175 nm and reduces the overall scintillation time. Here, we present our latest study of xenon-doped LAr with focus on the primary photon yield, the effective triplet lifetime and attenuation length, with xenon concentrations ranging from 3 ppm to 300 ppm. The scintillation and optical properties were measured simultaneously with the LLAMA instrument operated inside SCARF, a 1 ton LAr test stand, and the xenon concentrations using IDEFIX, a dedicated mass spectrometer setup. This research is supported by the DFG through the Excellence Cluster ORIGINS and the SFB1258.