Nuclear structure far off stability – New results from RISING

Abstract

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 INvestigation at GSI (RISING) project. It combines the EUROBALL Ge-Cluster detectors, the MINIBALL Ge detectors, the HECTOR-BaF detectors, and the fragment separator FRS. The secondary beams produced at relativistic energies are used for Coulomb excitation or secondary fragmentation experiments to study projectile like nuclei far off the stability line by measuring de-excitation photons. The physics studied comprises the evolution of shell structure towards the drip lines and its signatures as inferred from excitation energies, mirror symmetry and electromagnetic transition strengths. The first results of the "fast beam campaign" are discussed in comparison to various shell model calculations including the structure of light Sn isotopes based on Coulomb excitation of 108Sn, the discussion of the N = 32,34 sub-shell closure based on neutron-rich 56,58Cr isotopes, and the shell structure in light proton-rich Ca isotopes from the fragmentation of a 37Ca radioactive beam.