Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Astroparticle Physics II and Applications
HK 49.2: Gruppenbericht
Donnerstag, 1. März 2018, 14:30–15:00, HZO 100
Status of the COBRA Experiment — •Robert Temminghoff for the COBRA collaboration — TU Dortmund, Lehrstuhl für Experimentelle Physik IV, Otto-Hahn-Straße 4, 44227 Dortmund
The COBRA collaboration searches for neutrinoless double beta-decay (0νββ) which, if it exists, could give insights in physics beyond the Standard Model. COBRA uses commercially available room-temperature CdZnTe semiconductor detectors which are operated at the LNGS underground laboratory in Italy.
In the current demonstrator phase of the experiment, 64 detectors with a total mass of about 400 g are installed. This array has been used to set limits on the 0νββ-decay of several isotopes. In a dedicated low-threshold run, the fourfold-forbidden non-unique single-beta decay of 113Cd is currently under investigation. The spectral shape of this decay is closely connected to the effective value of axial vector coupling strength gA.
In 2018, the COBRA demonstrator will be upgraded with nine additional detectors of larger size, nearly doubling the total detector mass. In this so called Extended Demonstrator (XDEM) phase, several techniques will be implemented that could result in a lower background and enhance the physics performance compared to the demonstrator setup.
In this talk, the results from the COBRA demonstrator will be summarized and an overview of the status of the XDEM will be presented.