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T: Fachverband Teilchenphysik

T 16: Neutrinoloser Doppelbeta-Zerfall I

T 16.1: Gruppenbericht

Montag, 29. Februar 2016, 11:00–11:20, VMP9 SR 07

The COBRA Experiment - Status and Prospects — •Stefan Zatschler for the COBRA collaboration — TU Dresden, Institut für Kern- und Teilchenphysik, Germany

COBRA is a next-generation experiment dedicated to the search for the existence of neutrinoless double beta-decay (0νββ-decay). The aim is to clarify the nature of neutrinos as either Dirac or Majorana particles. Furthermore, the study of 0νββ-decay could allow for the identification of the neutrino mass hierarchy realized in nature and the determination of the effective Majorana neutrino mass in case of a signal.

Currently a demonstrator setup at the underground facility LNGS (Italy) built of 4×4×4 coplanar grid (CPG) detectors collects high quality low background physics data with FADC pulse shape sampling. The detectors are made of natural abundant CdZnTe, which is a commercially available room temperature semiconductor. It contains several double beta isotopes, the most promising of which is ¹¹⁶Cd with a Q-value of 2813.5 keV – which is well above the highest naturally occurring γ-lines.

In this talk an overview of the experimental status and recent results of the data analysis of the LNGS detector array will be presented. Additionally, newly developed techniques to reduce background via pulse shape analysis and future prospects towards a large-scale setup will be discussed.

The COBRA experiment is funded by the German Research Foundation DFG.