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T: Fachverband Teilchenphysik

T 45: Searches for Dark Matter I

T 45.4: Vortrag

Dienstag, 16. März 2021, 16:45–17:00, Tt

Investigation of coating methods for radon background reduction in liquid xenon experiments — •Mona Piotter, Hardy Simgen, and Florian Jörg for the XENON collaboration — Max-Planck-Institut für Kernphysik, Heidelberg

Several cosmological and astrophysical observations hint that a large fraction of the energy density of today's universe is present in the form of non-luminous matter. One candidate for this so-called dark matter is the WIMP (weakly interacting massive particle). Liquid xenon detectors are being used to search for their rare interactions with baryonic matter for which a very low background is necessary. The biggest source of background in these experiments originates from radon. To reduce this background, studies are carried out to examine the radon mitigation properties of surface coatings applied by electrodeposition. Previous investigations already showed that electrodeposited copper layers can offer a significant reduction in radon emanation. The various parameters of this coating method have now been systematically analyzed, with the focus being placed on the surface current density. The results of these investigations will be discussed during the talk.