Freiburg 2008 – scientific programme
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T: Fachverband Teilchenphysik
T 87: Niederenergie-Neutrinophysik und Suche nach Dunkler Materie II
T 87.2: Talk
Tuesday, March 4, 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).