Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 4: Matter at Low Temperature: Cryotechnique, Cryodetectors and Measuring Devices

TT 4.3: Vortrag

Montag, 23. März 2009, 12:00–12:15, HSZ 105

Low Temperature Setup for Quenching Factor Measurements of CaWO₄ with Neutrons — •Christian Ciemniak¹, Chiara Coppi¹, Franz von Feilitzsch¹, Achim Gütlein¹, Christian Isaila¹, Jean-Côme Lanfranchi¹, Sebastian Pfister¹, Walter Potzel¹, Sabine Roth¹, and Wolfgang Westphal^1,2 — ¹Technische Universität München, Physik-Department E15, James-Franck-Str., D-85748 — ²Deceased

CRESST is an experiment for the direct detection of dark matter (WIMPs) via nuclear recoil measurements on a CaWO₄ crystal. Different quenching factors for the nuclei allow the discrimination between background and a possible signal. To measure the quenching factors at low temperatures, a neutron scattering facility has been set up at the Maier-Leibnitz-Laboratory in Garching. In 2007 a cryostat has been installed and first measurements have been performed. For further optimization and to allow flight-time measurements at a fixed scattering angle, new electronic modules are presently being installed. We report on first results and ongoing upgrades. This work has been supported by funds of the DFG (SFB/Transregio 27: Neutrinos and Beyond), the Munich Cluster of Excellence (Origin and Structure of the Universe) and the Maier-Leibnitz-Laboratorium (Garching).