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T: Fachverband Teilchenphysik

T 55: Suche nach Dunkler Materie 2 (Direkter Nachweis)

T 55.7: Vortrag

Dienstag, 28. März 2017, 18:25–18:40, VSH 19

Absolute and Relative Reflectivity Measurements and Light Collection Efficiency Studies for the CRESST Experiment — •Alexander Langenkämper, Xavier Defay, Jean-Côme Lanfranchi, Erik Lindner, Elizabeth Mondragón, Andrea Münster, Corbinian Oppenheimer, Tobias Ortmann, Walter Potzel, Stefan Schönert, Hong Hanh Trinh Thi, Andreas Ulrich, Stephan Wawoczny, Michael Willers, and Andreas Zöller — Technische Universität München, Physik Department Lehrstuhl E15 und Excellence Cluster Universe, James-Franck-Straße, D-85748 Garching

The CRESST experiment aims for the direct detection of Dark Matter via elastic scattering off nuclei in CaWO₄ single crystals. The detectors are operated at mK temperatures and consist of the target crystal as well as a separated light detector. The simultaneous readout of phonon and light detector is used for particle identification. To increase the light collection both detectors are surrounded by a reflecting and scintillating foil which is characterised in this work. The results of wavelength and angle dependent absolute reflectivity measurements at 300 K as well as relative reflectivity measurements between 300 K and 20 K will be presented. The results are implemented in a GEANT4 simulation to study the light collection efficiency in CRESST detector modules and first results will also be shown. This work was supported by the DFG Excellenzcluster Origin and Structure of the Universe and the Maier-Leibnitz- Laboratory (Garching).