Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 70: Searches for Dark Matter II

T 70.3: Talk

Wednesday, March 17, 2021, 16:30–16:45, Tt

A New Radon Emanation Chamber for the Radiopurity Assay of DARWIN — •Daniel Baur — University of Freiburg, Freiburg, Germany

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 assessment 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, where the daughters of 222Rn are collected electrostatically on a silicon PIN diode and the subsequent alpha decays are detected. We report on a new suchlike detector for the radiopurity assay of DARWIN, currently being commissioned in Freiburg.