High Spin States Populated via Projectile Fragmentation in Very Neutron-Rich Nuclei Around Mass 180

Abstract

for the GSI ISOMER collaboration K-isomers can be found mainly in the A∼180 region. The best examples of K-isomerism are predicted to occur on the neutron-rich side of the valley of stability and are thus barely reachable by standard nuclear reactions like deep inelastic reactions. Up to now, only projectile fragmentation has proven to be an efficient method in populating heavy neutron-rich isotopes with cross-sections sufficient to perform γ-ray spectroscopy. Thus, the FRagment Separator [1] (FRS) associated with γ-ray spectroscopy techniques has been successfully used at GSI to search for K-isomers with lifetimes ranging from nano-to milliseconds in the mass region around A∼180.