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T: Fachverband Teilchenphysik

T 79: Suche nach Dunkler Materie 3 (Direkter Nachweis)

T 79.4: Vortrag

Mittwoch, 29. März 2017, 17:40–17:55, VSH 19

Characterization of the non-linearity of the light-yield at low energy deposition in CaWO₄ crystals — •Erik Lindner, Xavier Defay, Jean-Côme Lanfranchi, Alexander Langenkämper, 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 1, D-85748 Garching

The CRESST experiment uses scintillating CaWO₄ single crystals as target material for direct dark matter search. A particle interaction in the crystal simultaneously produces heat and light. The light-yield, defined as the ratio of energy in the light channel compared to the phonon channel, can be used as discrimination parameter for different event classes. The light-yield shows a crystal dependent non-linear behaviour at low energy depositions in the crystal. The CaWO₄ crystals of the current phase CRESST-III are mainly produced at the TUM. To investigate the energy dependence of the growth parameters, a coincident Compton scattering experiment is conducted. The experimental setup, the latest results, and future plans for the experiment will be presented. This research was supported by the DFG cluster of excellence "Origin and Structure of the Universe" and the Maier-Leibnitz-Laboratorium (Garching).