CERN Accélérateur de science

For the measurement of rare γ decays with low γ-ray multiplicities (Mγ < 15) dedicated Ge-detector arrays are being developed. They are optimized with respect to the full-energy peak efficiency rather than the resolving power. These so-called miniball arrays will pre-dominantly be used at radioactive ion beam facilities. The detector arrays will have a high granularity using segmented Ge-detectors to provide a sufficient angular resolution of the γ rays which is needed for proper Doppler-shift corrections and small Doppler-broadening. We will describe shortly the Miniball presently developed by a German, Belgian, and Italian collaboration and the wide range of physics to be addressed with this new detector system.