Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 6: Suche nach dunkler Materie I

T 6.4: Talk

Monday, March 19, 2018, 16:50–17:05, Philo-HS6

Radon background in the dark matter experiment XENON1T — •Natascha Rupp — Max Planck Institut für Kernphysik, Heidelberg

The dark matter experiment XENON1T aims for a direct detection of WIMPs (weakly interacting massive particles) by using liquid xenon as target material. The noble and radioactive gas radon constitutes the dominant background source in XENON1T. It constantly emanates into the liquid xenon and potentially reaches the sensitive volume, where the decay of its daughter isotopes can mimic dark matter interactions. A careful selection of low-radon-emanating detector materials mitigates this source of background. Therefore, radon emanation measurements of the individual detector parts are performed before construction. A few results of those measurements are presented. Furthermore, the level of radon and certain daughter isotopes is determined in the data analysis, which allows to set limits on the induced background rate. It was seen that the total radon level in the detector determined by emanation measurements and in data analysis agree well with one another.