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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 Willers^1,2, Andrea Münster¹, Jean-Côme Lanfranchi^1,2, Lothar Oberauer^1,2, Walter Potzel¹, Sabine Roth¹, Stefan Schönert^1,2, 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).