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T: Fachverband Teilchenphysik

T 87: Niederenergie-Neutrinophysik und Suche nach Dunkler Materie II

T 87.2: Vortrag

Dienstag, 4. März 2008, 17:00–17:15, KGI-HS 1098

First results of bulk quenching factor measurements of CaWO₄ at mK temperatures with monoenergetic neutrons — •Chiara Coppi¹, Christian Ciemniak¹, Franz von Feilitzsch¹, Achim Gütlein¹, Christian Isaila¹, Jean-Come Lanfranchi¹, Sebastian Pfister¹, Walter Potzel¹, Wolfgang Rau¹, Sabine Roth¹, Michael Stark¹, Wolfgang Westphal¹, Josef Jochum², Marcel Kimmerle², Christof Sailer², Stephan Scholl², and Igor Usherov² — ¹Physikdepartment E15, Technische Universität München, James-Franck-Straße, 85748 Garching — ²Eberhard Karls Universität Tübingen, Physikalisches Institut I, Auf der Morgenstelle 14, 72076 Tübingen - Germany

The CRESST dark matter detectors, based on CaWO₄ scintillating crystals, are able to discriminate gamma and beta background by the simultaneous measurement of the light and phonon signal produced by particle interactions, due to the different light output (quenching factor) for nuclear and electron recoils. At the TUM in Garching, two types of experiments are being performed to measure the quenching factors of the different nuclei (O, Ca, W) of the detector crystal at ∼40 mK: a) Measurements with standard neutron sources (²⁴¹Am-Be and ²⁵²Cf). b) Measurements with a monoenergetic neutron beam and fixed scattering angle at a newly installed set-up at the Maier-Leibnitz-Beschleuniger-Laboratorium in Garching. Results of the first beamtime with monoenergetic neutrons will be discussed. This work has been supported by the DFG (SFB Tr 27), the Cluster of Excellence (Origin and Structure of the Universe) and the MLL (Garching).