Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Astroteilchenphysik

HK 15.6: Talk

Monday, March 17, 2014, 18:30–18:45, HZ 9

Scintillating CaWO₄ Crystals for the CRESST-II and EURECA Dark Matter Searches — •Moritz v. Sivers¹, Andreas Erb², Andreas Ertl¹, Achim Gütlein¹, Jean-Côme Lanfranchi¹, Andrea Münster¹, Felix Neumann¹, Walter Potzel¹, Sabine Roth¹, Stefan Schönert¹, Raimund Strauss³, Stephan Wawozcny¹, Michael Willers¹, Marc Wüstrich³, and Andreas Zöller¹ — ¹Physik Department, E15, Technische Universität München, 85748 Garching — ²Walther-Meissner-Institut für Tieftemperatur Forschung, 85748 Garching — ³Max-Planck-Institut für Physik, 80805 München

The CRESST-II experiment for the direct detection of WIMP dark matter uses scintillating CaWO₄ crystals that are operated as low-temperature detectors. EURECA is a joint collaboration of existing cryogenic direct dark matter searches to develop a future multi-material experiment with a target mass of up to one ton. While in the past crystals were obtained from external suppliers, we recently started producing CaWO₄ single crystals with a dedicated Czochralski furnace at the Technische Universität München to have a direct influence on the radiopurity and scintillation properties. We present here an overview of the growth process as well as measurements of the crystals’ scintillation properties and radiopurity. This research was supported by the DFG cluster of excellence: "Origin and Structure of the Universe", the "Helmholtz Alliance for Astroparticle Phyiscs", the "Maier-Leibnitz-Laboratorium" (Garching) and by the BMBF: Project 05A11WOC EURECA-XENON.