Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 28: Niederenergie Neutrinophysik II
T 28.6: Vortrag
Montag, 9. März 2015, 18:00–18:15, I.12.01 (HS 30)
Background Suppression in TeO2 Bolometers with Neganov-Luke Amplified Cryogenic Light Detectors — •Michael Willers1,2, Andrea Münster1, Jean-Côme Lanfranchi1,2, Lothar Oberauer1,2, Walter Potzel1, Sabine Roth1, Stefan Schönert1,2, Stephan Wawoczny1, Andreas Zöller1, and Andrea Giuliani3 — 1Technische Universität München, Physik Department E15, James Franck Straße, 85748 Garching — 2Excellence Cluster Universe, Technische Universität München, Boltzmannstr. 2, 85748, Garching — 3Centre de Sciences Nucléaires et de Sciences de la Matière, 91405 Orsay Campus, France
The Neganov-Luke (NL) effect offers a promising way to increase the sensitivity of cryogenic light detectors at low energies. In this talk we show that a highly efficient discrimination between α and e−/γ induced events in TeO2 crystals (used in the search for the neutrinoless double beta decay) can be achieved by measuring the Cherenkov radiation emitted by high-energetic electrons within the crystal. By using NL amplified light detectors, a suppression of ∼99% of α-induced events with energies close to the Q-value of 130Te at ∼ 2.5MeV has been achieved for the first time while simultaneously accepting 99.8% of all e−/γ-induced events.
This research was supported by the DFG cluster of excellence “Origin and Structure of the Universe”, the “Helmholtz Alliance for Astroparticle Phyiscs” and the “Maier-Leibnitz-Laboratorium”(Garching).