Heidelberg 2007 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 508: Dunkle Materie und niederenergetische Neutrinos

T 508.7: Vortrag

Freitag, 9. März 2007, 15:30–15:45, KIP SR 2.403

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. For a detailed understanding of the detector response to nuclear recoils, especially concerning the light yield or quenching factor, measurements have been performed with different neutron sources as well as with 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).