Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 50: Search for Dark Matter 2

T 50.7: Vortrag

Dienstag, 22. März 2022, 17:45–18:00, T-H35

The MonXe Radon Emanation Chamber — •Daniel Baur for the DARWIN collaboration — Albert-Ludwigs-Universität Freiburg

Liquid xenon-based experiments are currently leading the search for WIMP dark matter. Their electronic recoil background in the energy region of interest is dominated by the naked (i.e., not accompanied by the coincident emission of a gamma-ray) beta decays of ²¹⁴Pb, a progeny of ²²²Rn which is emanated from all material surfaces. Consequently, the reduction of ²²²Rn emanation is mandatory for the success of next-generation dark matter experiments with multi-ton xenon targets such as DARWIN.

The ²²²Rn surface emanation can be measured directly with a radon emanation chamber. In such a detector the daughters of ²²²Rn are collected electrostatically on a silicon PIN diode and the subsequent alpha decays are measured spectrometrically. We report on the MonXe radon emanation chamber, which was recently commissioned in Freiburg for the radiopurity assay of DARWIN.