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Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 52: Suche nach dunkler Materie III

T 52.9: Talk

Wednesday, March 21, 2018, 18:40–18:55, Philo-HS5

Improving the radiopurity of CaWO4 crystals for the CRESST experiment — •A. Kinast1, A. Erb1,2, T. Faestermann1, G. Korschinek1, A. Langenkämper1, E. Lindner1, A. Münster1, E. Mondragon1, T. Ortmann1, S. Pavetich3, W. Potzel1, S. Schönert1, H. H. Trinh Thi1, S. Wawoczny1, A. Wallner3, and M. Willers11Physik-Department, Technische Universität München, D-85748 Garching — 2Walther-Meißner-Institut für Tieftemperaturforschung, D-85748 Garching — 3Department of Nuclear Physics, Australian National University, Canberra, Australia

The direct dark matter search experiment CRESST uses scintillating CaWO4 single crystals as targets for possible recoils of dark matter particles. For several years these CaWO4 crystals are produced directly at TUM including the CaWO4 powder production from the raw materials CaCO3 and WO3 as well as the crystal growth via the Czochralski method. To further increase the sensitivity of the CRESST experiment, an improvement of the crystal radiopurity is crucial. To achieve this goal, a new method for the chemical purification of the raw materials has been developed at TUM. In order to investigate the radiopurity-level achieved by this method, highly-sensitive screening methods are required. In this work Accelerator Mass Spectrometry (AMS) has been tested for CaWO4 radiopurity screening and first results will be presented. This research was supported by the DFG cluster of excellence “Origin and Structure of the Universe”, by the BMBF Verbundprojekt 05A2017 CRESST-XENON and by the SFB1258.

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