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Bonn 2010 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 107: Niederenergie-Neutrinophysik und Suche nach dunkler Materie I

T 107.7: Vortrag

Montag, 15. März 2010, 18:25–18:40, HG XI

Application of the Neganov-Luke Effect for Scintillation-Light Detectors — •Christian Isaila1, Christian Ciemniak1, Chiara Coppi1, Franz von Feilitzsch1, Achim Gütlein1, Tobias Lachenmaier1, Jean-Côme Lanfranchi1, Sebastian Pfister1, Walter Potzel1, Sabine Roth1, Moritz von Sivers1, Raimund Strauss1, and Wolfgang Westphal1,21Technische Universität München, Physik-Department E15, James-Franck Str., 85748 Garching — 2Deceased

For an active suppression of the background induced by electron recoils in the CRESST experiment both phonons and scintillation light generated in a CaWO4 crystal are detected simultaneously using detectors based on transition-edge sensors (TES). Taking into account that only a small fraction (about 1%) of the energy deposited in the crystal is detected as light, very sensitive light detectors are required for an efficient background discrimination. Following Neganov and Luke, the threshold of the light detectors can be improved by drifting the electron-hole pairs generated by the scintillation photons by an applied electric field. Thus, additional phonons are created leading to an amplification of the phonon signal. The application of the Neganov-Luke effect made it possible to improve the signal-to-noise ratio by a factor of 10 resulting in a 5-sigma energy threshold of about 10 eV. Results from measurements with Neganov-Luke amplification will be presented. This work has been supported by funds of the DFG (Transregio 27: Neutrinos and Beyond), the Excellence Cluster (Origin and Structure of the Universe) and the Maier-Leibnitz-Laboratorium (Garching).

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