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T: Fachverband Teilchenphysik

T 65: Niederenergie-Neutrinophysik 3

T 65.7: Group Report

Tuesday, March 25, 2014, 18:20–18:40, P106

The COBRA Experiment - Status Report — •Nadine Heidrich for the COBRA collaboration — Institut für Experimentalphysik, Universität Hamburg, D

COBRA is a next–generation experiment searching for neutrinoless double beta (0νββ) decay using CdZnTe semiconductor detectors. The main focus is on ¹¹⁶Cd, with a decay energy of 2813.5 keV well above the highest naturally occurring gamma lines. By measuring the half-life of the 0νββ decay, it is possible to clarify the nature of the neutrino as either Dirac or Majorana particle and furthermore to determine the effective Majorana mass.
Within the R&D program, the coplanar grid (CPG) detector technology was delevoped for CdZnTe. In 2013 the number of operated detectors was doubled. Therefore, 64 CPG detectors are currently running at the LNGS with a FADC readout. Due to pulseshape analysis, the background can already be reduced significantly.
In the talk an overview about the COBRA experiment, the detector technology and the recent progress is given. In addition, future plans will be dicussed.