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T: Fachverband Teilchenphysik
T 53: Dark Matter II
T 53.1: Vortrag
Mittwoch, 1. April 2020, 16:30–16:45, H-HS XIV
Hardware R&D Towards DARWIN: Construction of a Radon Emanation Chamber — •Daniel Baur — Albert-Ludwigs-Universität, 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 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, where the daughters of 222Rn are collected electrostatically on a silicon PIN diode and the subsequent alpha decays are detected. We present a new radon emanation chamber which is being constructed in Freiburg and show first results.