CERN Accélérateur de science

Nuclear structure studies at GSI attracted recently increased interest for
the results of present activities as well as for the future project FAIR. A broad
range of physics phenomena can be addressed by high-resolution in-beam γ-ray
spectroscopy experiments with radioactive beams offered within the Rare Isotopes Spectroscopic INvestigation at GSI (RISING) project. It combined the
EUROBALL Ge-Cluster detectors, the MINIBALL Ge detectors, the HECTORBaF detectors, and the fragment separator FRS. The secondary beams produced
at relativistic energies were used for Coulomb excitation or secondary fragmentation experiments to study projectile like nuclei by measuring de-excitation photons. The first results of the “fast beam campaign” is discussed in comparison
to various shell model calculations. The discussion focuses on the N = 32, 34
sub-shell closure based on neutron rich Cr isotopes. Alternatively, the relativistic
radioactive beams, both in their ground and isomeric states, were implanted and
their decay could be investigated. The “stopped beam campaign” has started in
October 2005 with a series of g-factor measurements. It continued from February 2006 with the next configuration and the main goal of identification of new
isomers and angular momentum population in fragmentation reactions.