Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 32: Neutrinophysik II
T 32.2: Group Report
Tuesday, March 26, 2019, 16:20–16:40, H11
The COBRA Double Beta Decay Experiment — •Robert Temminghoff for the COBRA collaboration — TU Dortmund, Lehrstuhl für Experimentelle Physik IV, Otto-Hahn-Straße 4, 44227 Dortmund
The aim of the COBRA collaboration is to search for neutrinoless double beta-decay (0νββ-decay) with CdZnTe semiconductor detectors. This long-sought lepton number violating process is predicted by many Beyond-Standard-Model theories. Advantages of CdZnTe detectors are their commercial availability and ability to work at room-temperature, allowing for easy instrumentation and operation.
COBRA is currently operating two different sets of detectors in a low-background setup at the LNGS in Italy, placed in two distinct arrays, but sharing the same shielding and infrastructure. The demonstrator array consists of 64 1 cm3 detectors and has now been in operation for several years. It has been used not only to search for various 0νββ-decays, but also to perform an analysis of the spectral shape of the fourfold-forbidden β−-decay of 113Cd in a low-threshold run.
In 2018, nine additional detectors with a size of 6 cm3 were installed forming the extended demonstrator (XDEM). Besides being much larger, thus having a higher detection efficiency, these detectors were designed with a novel electrode structure, which helps to suppress the dominating surface related backgrounds found in the demonstrator.
In this talk, the current status of the experiment will be presented, including recent results from the spectral shape-investigation and first operational experiences of the XDEM.