Dresden 2013 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 102: Niederenergie-Neutrinophysik 4

T 102.2: Vortrag

Mittwoch, 6. März 2013, 17:05–17:20, WIL-A317

Development of a shield based on Monte–Carlo studies for the COBRA Experiment — •Nadine Heidrich — Institut für Experimentalphysik, 22761 Hamburg, D

COBRA is a next–generation experiment searching for neutrinoless double beta 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.
The concept for a large scale set–up consists of an array of CdZnTe detectors with a total mass of 420 kg enriched in ¹¹⁶Cd up to 90 %. With a background rate in the order of 10⁻³ counts/keV/kg/year, the experiment would be sensitive to a half–life larger than 10²⁶ years, corresponding to a Majorana mass term m_ββ smaller than 50 meV.
To achieve the background level, an appropriate shield is necessary. The shield is developed based on Monte–Carlo simulations. For that, different materials and configurations are tested. In the talk the current status of the Monte–Carlo survey is presented and discussed.