Wuppertal 2015 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 31: Dunkle Materie II

T 31.6: Vortrag

Montag, 9. März 2015, 18:10–18:25, K.11.24 (HS 33)

Radiopurity of CaWO₄ Crystals for Direct Dark Matter Search with CRESST and EURECA — •Andrea Münster for the CRESST collaboration — Physik Department E15, Technische Universität München, 85748 Garching

The direct dark matter search experiment CRESST uses scintillating CaWO₄ single crystals as targets for possible WIMP recoils. A particle interaction in the crystal produces phonons as well as scintillation light. As the light signal is dependent on the kind of interacting particle, e⁻-recoils and α-decays mainly originating from intrinsic impurities of the crystal can be discriminated from nuclear recoils (e.g. due to possible WIMP scatterings). To achieve the best possible discrimination a high light output and a high radiopurity of the crystals are crucial. Since 2011 CaWO₄ crystals are grown in the crystal lab of TU Munich. In this way we can directly influence the growth parameters and find a method to improve light output and radiopurity which is required by CRESST and the future tonne-scale multi-material experiment EURECA. In this talk we will discuss the investigated radiopurity of the raw materials WO₃ and CaCO₃ as well as of TUM-grown crystals which are currently taking data in CRESST II Phase 2. This research was supported by the DFG cluster of excellence ’Origin and Structure of the Universe’, by the Maier-Leibnitz-Laboratorium (Garching), by the BMBF: Project 05A11WOC EURECA-XENON, by the Spanish Ministerio de Economía y Competitividad and the European Regional Development Fund (MINECO-FEDER), and by the Consolider-Ingenio 2010 Programme under grant MULTIDARK CSD2009-00064.