Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 31: Dunkle Materie II

T 31.7: Talk

Monday, March 9, 2015, 18:25–18:40, K.11.24 (HS 33)

Scintillator Non-Proportionality in CaWO₄ Crystals — •Cecilia Bruhn, Philipp Bauer, Ferdinand Hitzler, Raphael Jakoby, Raphael Jakoby, Jean-Côme Lanfranchi, Alexander Langenkämper, Andrea Münster, Walter Potzel, Sabine Roth, Stefan Schönert, Stephan Wawoczny, Michael Willers, and Andreas Zöller for the CRESST collaboration — Physik-Department E15, Technische Universität München, 85748 Garching

CRESST-II is a direct dark matter search experiment whose goal is to find elastic WIMP-nucleus scatterings. It utilizes scintillating CaWO₄ crystals as target material, which are produced at the TUM. A particle interaction in the crystal produces phonons and scintillating light. The light output depends on the type of interacting particle, thus enabling a discrimination between electron recoils, which are due to background, and nuclear recoils, which could be a possible WIMP signal. For energies under 100 keV the amount of scintillating light produced is not proportional to the energy deposited. This is the scintillator non-proportionality, which can cause problems when distinguishing electron recoils from nuclear recoils. In this talk we will discuss an experimental setup for measuring the crystal dependency of the scintillator non-proportionality. 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, and by the Consolider-Ingenio 2010 Programme under grant MULTIDARK CSD2009-00064.