Abstract
The COBRA experiment uses CdZnTe semiconductor detectors to search for neutrinoless double beta decays. The main focus is on the isotope 116Cd, with a decay energy of 2813.5 keV well above the highest naturally occurring gamma lines. Also 130Te and 106Cd, a double β+ emitter, are under investigation.An overview of the recent improvements of the COBRA low-background set-up at the LNGS underground laboratory is given, including first results obtained with new FADC readout electronics which allows background reduction by pulse-shape analysis. Furthermore studies on detector characterization, the use of liquid scintillator for background suppression and Monte-Carlo simulations of the shielding are presented. Also pixelated detectors and their capabilities of background reduction are discussed.
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