Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 76: Dark Matter III

T 76.1: Vortrag

Donnerstag, 2. April 2020, 16:30–16:45, H-HS XIV

Ultra-low energy calibration of the XENON1T detector with a diluted ³⁷Ar source — •Matteo Alfonsi for the XENON collaboration — Institut für Physik & Exzellenzcluster PRISMA, J. Gutenberg-Universität Mainz, 55099 Mainz, Germany

In 2018 the XENON1T experiment set the most stringent constraints on the interaction cross-section between nucleons and Dark Matter in the form of Weakly Interacting Massive Particles. Due to the size of the active volume and the excellent self shielding properties of liquid xenon, the understanding of the detector response relies to a large extent on internal calibrations, based on ^83mKr and ²²⁰Rn gaseous isotopes diluted into the liquid xenon and uniformly distributed inside the active volume. In Autumn 2018 we introduced a new low energy calibration source, the ³⁷Ar isotope, with calibration lines at energies of 2.8 keV and 270 eV. The radioisotope was quickly and efficiently removed after two weeks of data-taking by means of cryogenic distillation. In this talk we will show the results of this calibration and the study of the detector response at these ultra low energies. We also compare these results with our Monte Carlo simulation framework of the detector response, to further validate the model used in the Dark Matter search results.