München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 6: Kern- und Teilchen-Astrophysik

HK 6.6: Vortrag

Montag, 20. März 2006, 15:45–16:00, E

Current Status and Recent Results of the COBRA experiment — •Daniel Muenstermann — Lehrstuhl für Experimentelle Physik IV, Universität Dortmund, 44221 Dortmund

The COBRA experiment is aiming to use a large 3D array of CdZnTe semiconductor detectors to search for ββ-decays of 9 Cd, Zn and Te isotopes, 4 among them being subject to one of the β⁺β⁺-decay channels. Once 0νβ⁻β⁻-decay has been confirmed, these decay channels are expected to yield important information for the disentanglement of the underlying mechanisms while being largely ignored by other experiments.

The collaboration has operated a 2x2 detector protoype since 2003 in the Gran Sasso underground laboratory (LNGS) and used it to develop scalable technologies that are well-suited for low-level measurements. First physics results and half-life limits from the measurements performed at LNGS with this setup are reported.

As the next step towards a large-scale setup, a 4x4x4 detector prototype is currently being commissioned which will be used to prove the scalability of the concept and gain experience in operating a multi-detector array. The concept of the setup and the current status of the 64-detector array are presented.