Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 22: Search for Dark Matter 1
T 22.7: Vortrag
Montag, 21. März 2022, 17:50–18:05, T-H35
Coating techniques for radon mitigation in liquid xenon detectors — •Mona Piotter, Hardy Simgen, and Florian Jörg — Max-Planck-Institut für Kernphysik, Heidelberg
Searching for rare events like dark matter interaction or neutrinoless double beta decay using liquid xenon detectors, requires a low radon background. Radon, which is part of the uranium and thorium decay chain, can continuously emanate from the detector materials. Current attempts to lower the radon induced background include the selection of radio-pure materials, techniques allowing to actively remove radon from xenon, as well as data selection criteria. However, next generation experiments will require even lower radon levels which likely can not be achieved by employing those methods alone. A new technique to stop radon emanation based on surface coatings has been investigated. This requires a tight and radium-free layer. We have developed a electro-deposited copper coating and present here the promising results. During the development, we systematically investigated the coating parameters with the short-lived 220Rn emanating from tungsten rods or stainless steel plates. After this preliminary tests we applied the coating to a suitable 222Rn emanating stainless steel source, which has a longer half-life. It was produced at the CERN facility ISOLDE by implanting 226Ra in stainless steel plates. In the talk we present the results of the first coating of that sample.