Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 78: Experimental Techniques in Astroparticle Physics 3

T 78.1: Talk

Wednesday, March 23, 2022, 16:15–16:30, T-H37

Monoenergetic electronic recoil calibration of LXe TPCs with 37Ar (XENON1T/nT) — •Christopher Hils for the XENON collaboration — Institut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany

Large multi-ton LXe time projection chambers like XENON1T/nT set the most stringent constraints on the interaction cross-section between nucleons and Dark Matter in form of Weakly Interacting Massive Particles. The large active volume and the excellent self shielding properties of liquid xenon make the use of internal calibration sources a necessity to understand detector responses. In the past these calibrations were mainly based on gaseous 83mKr and 220Rn isotopes diluted into the liquid xenon and distributed equally into the active volume. In the last science run of XENON1T we introduced a new low-energy calibration source, the Argon isotope 37Ar, with calibration lines at energies of 2.8 keV and 270 eV. In this talk we will present the results of the XENON1T calibration in form of a study of the detector response at these ultra low energies. We also show that the isotope can be efficiently removed by cryo distillation in the XENON1T distillation column originally designed for krypton removal, which made this isotope suitable as a regular calibration source despite ist long halflife time of 35 d. In this regard, a first calibration was already performed In XENONnT at the end of 2021 with first results about to come.