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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Kern- und Teilchen-Astrophysik

HK 7.3: Talk

Monday, March 12, 2007, 18:30–18:45, E

Low Temperature Setup for Quenching Factor Measurements of CaWO4 with Neutrons — •Chiara Coppi, Christian Ciemniack, Franz von Feilitzsch, Achim Gütlein, Christian Isaila, Jean-Come Lanfranchi, Sebastian Pfister, Walter Potzel, Wolfgang Rau, Sabine Roth, Michael Stark, and Wolfgang Westphal — Physikdepartment E15, Technische Universität München, James-Franck-Straße, 85748 Garching

In the CRESST experiment, we are able to distinguish electron from nuclear recoils by the measurement of coincident phonon and scintillation light signals produced by an event in the CaWO4 Crystals. At the TUM, experiments have been performed to determine the light output (quenching factor) caused by the different recoiling nuclei. Standard neutron sources have been applied as well as a monoenergetic pulsed neutron beam of the tandem accellerator at the Maier-Leibnitz-Laboratory in Garching. Measurements of the quenching factors at low temperature (mK) with a monoenergetic neutron beam are in preparation. The influence of the cryostat on the neutron beam has been investigated with a profile measurement. The results indicate that the cryostat filled with liquid helium does not change the beam profile significantly and causes only moderate background. This work has been supported by funds of the DFG (SFB 375, Transregio 27), the Cluster of Excellence (Origin and Structure of the Universe) and the Maier-Leibnitz-Laboratorium (Garching).