Dresden 2013 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 105: Suche nach Dunkler Materie 1
T 105.2: Vortrag
Montag, 4. März 2013, 11:20–11:35, HSZ-103
In Situ Determination of Quenching Factors in Cresst-II — •Andreas Zöller1, Andreas Ertl1, Achim Gütlein1, Josef Jochum2, Jean-Come Lanfranchi1, Andrea Münster1, Walter Potzel1, Franz Pröbst3, Stephan Scholl1,3, Moritz von Sivers1, Raimund Strauss1, Sabine Roth1, Stephan Wawoczny1, Michael Willers1, and Marc Wüstrich1 — 1Technische Universität München, Physik Department E15 — 2Eberhard Karls Universität Tübingen — 3Max Planck Institut für Physik, München
The CRESST-II experiment is searching for WIMPs (Weakly Interacting Massive Particles) via their elastic scattering off nuclei in scintillating CaWO4 single crystals at low temperatures. Each particle interaction in CaWO4 produces a phonon as well as a light signal. The ratio between the recorded light and phonon signal - the Quenching Factor (QF) - is a crucial parameter to discriminate very efficiently between electron recoils from radioactive e/γ background and nuclear recoils, e.g. WIMP events. Moreover, to some extent, the different types of recoiling nuclei (O, Ca, W) can be distinguished, if the QFs are known accurately enough. The QF cannot only be extracted from dedicated experiments but also from calibration data, gathered with an AmBe-source placed inside and outside the neutron shielding of CRESST-II. In this talk we present a method to determine the QFs of CaWO4 in situ from these calibration data.