The VEGA/Euroball group at GSI is occupied with nuclear structure physics employing gamma-ray spectroscopy and the development of novel gamma-ray detection systems.
We are involved in the VEGA project aiming for gamma-detection systems optimized for nuclear decay studies and in-beam spectroscopy at lower gamma-multiplicity. The on-going development of Ge-detectors for VEGA is performed in close collaboration with the Miniball and Exogam project. In particular we are focussing on the Segmented Clover detector and its improvements. We have started the preparation for the new RISING project employing Euroball detectors at GSI. Starting in 2003 experimental campaigns with these detectors using exotic FRS beams for in-beam spectroscopy are planned. Set-ups suitable for relativistic beam energies, Coulomb barrier energies and stopped fragment beams are under consideration. Within the Euroball project gamma-ray tracking is being investigated in order to optimize the performance of 4-pi spectrometers of the next generation. We are emphasizing on pulse shape analysis of the detector signals. Within the GSI upgrade program we are planning AGATA, an Advanced GAmma-Tracking Array. Complementary to high resolution Ge-spectrometers we are operating the NaI Crystal Ball at GSI in collaboration with the MPI für Kernphysik, Heidelberg. In addition, we develop ancillary detectors to serve our experimental program.
Our experimental program focusses on the spectroscopy of exotic nuclei employing both radioactive and stable heavy ion beams. A new Pre-VEGA campaign employing both VEGA and Exogam Segmented Clover detectors is currently being prepared to be ready to run in the end of 2001. In a recent campaign we searched for new K-isomers employing fragmentation reactions. Nuclear species around A=180 in their isomeric states were populated at SIS/FRS and the gamma-decay was measured after implantation in a catcher. An experiment performed with the SARI set-up at JYFL served to investigate the nuclear structure of 252No. Another topic is the attempt to do high resolution gamma-spectroscopy of Hyper-nuclei being produced by (pi+,K+) reactions employing the new GSI pion facility. In 1996 a series of Euroball Cluster experiments at GSI have successfully been performed. Cluster detectors were used in various set-ups to enable a wide program comprising investigations of e.g. pair transfer, multi-phonon surface vibrations, N=Z nuclei around A=100 and the fine structure of GT-resonances. Earlier on Coulomb excitation and heavy ion transfer studies at beam energies around the Coulomb barrier were performed.
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