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T: Fachverband Teilchenphysik

T 62: Suche nach dunkler Materie III

T 62.5: Vortrag

Dienstag, 1. März 2016, 17:50–18:05, VMP9 SR 28

Characterization of scintillation properties of high-purity CAWO₄ crystals for the CRESST experiment — •C. Oppenheimer, X. Defay, T. Drohmann, A. Erb, R. Hampf, J.-C. Lanfranchi, A. Langenkämpfer, A. Münster, E. Mondragon, L. Oberauer, W. Potzel, S. Schönert, H. Steiger, H.H. Trinh Thi, A. Ulrich, S. Wawoczny, M. Willers, V. Zimmer, and A. Zöller — Physik-Department and Excellence Cluster Universe, Technische Universität München, D-85748 Garching

In the scope of the dark matter search experiment CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) the Technische Universität München (TUM) produces high purity CaWO₄ single crystals. CRESST uses these scintillating crystals as targets to directly search for dark matter particles. An important factor for the event detection and discrimination is the light-output of the crystals. This light-output shows a crystal dependent non-linear behaviour at low energies, which affects the discrimination capabilities of the detector. To investigate this behaviour and the dependency on the growth parameters, a Compton scattering experiment will be conducted. The experimental setup and first results will be presented. This research was supported by the DFG cluster of excellence “Origin and Structure of the Universe”, by the Helmholtz Alliance for Astroparticle Physics, by the Maier-Leibnitz-Laboratorium (Garching) and by the BMBF.