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T: Teilchenphysik
T 508: Kosmische Strahlung X
T 508.9: Vortrag
Donnerstag, 30. März 2006, 18:20–18:35, HG2-HS1
Quenching Factor Measurement for CaWO4 with Neutrons — •Chiara Coppi1, Franz von Feilitzsch1, Christian Isaila1, Thomas Jagemann2, Josef Jochum2, Tobias Lachenmaier2, Jean-Côme Lanfranchi1, Walter Potzel1, Wolfgang Rau1, Michael Stark1, Doreen Wernicke1,3, and Wolfgang Westphal1 — 1Technische Universität München, Physik Department E15, James-Franck-Straße, D-85748 Garching, Germany — 2Eberhard Karls Universität Tübingen, Physikalisches Institut I, Auf der Morgenstelle 14, D-72076 Tübingen, Germany — 3VeriCold Technologies GmbH, Bahnhofstr. 21, D-85737 Ismaning, Germany
CRESST is an experiment to search for Dark Matter particles (WIMPs). The CaWO4 crystals of CRESST are able to distinguish electron from nuclear recoils by the measurement of coincident phonon and scintillation light signals produced in an event. Since WIMPs are expected to react via nuclear recoils, this allows to discriminate most of the background. Neutrons however also produce nuclear recoils, but a neutron signal would mainly originate from oxygen recoils while WIMPs, prefering haevy nuclei, scatter mainly off tungsten.
At the TUM, experiments have been performed to determine the light output (quenching factor) from the different recoiling nuclei. Standard neutron sources have been applied as well as a monoenergetic pulsed neutron beam produced at the tandem accellerator at the Maier-Leibnitz-Laboratory in Garching. Results, status and future plans for the differen measurements will be presented.