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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 Zöller11Physik 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.

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