This contribution is based on the combination of the talks: “What can we learn from large‐scale mass measurements,” “Present and future experiments with stored exotic nuclei at relativistic energies,” and “Beta decay of highly‐charged ions.” Studying the nuclear mass surface gives information on the evolution of nuclear structure such as nuclear shells, the onset of deformation and the drip‐lines. Previously, most of the masses far‐off stability has been obtained from decay data. Modern methods allow direct mass measurements. They are much more sensitive, down to single atoms, access short‐lived species and have high accuracy. Large‐scale explorations of the nuclear mass surface are ideally performed with the combination of the in‐flight FRagment Separator FRS and the Experimental Storage Ring ESR. After a brief historic introduction selected examples such as the evolution of shell closures far‐off stability and the proton‐neutron interaction will be discussed in the framework of our data. Recently, the experiments have been extended and led to the discovery of new heavy neutron‐rich isotopes along with their mass and lifetime measurements. Storage rings applied at relativistic energies are a unique tool to study the radioactive decay of bare or few‐electron atomic nuclei. New features observed with the analysis of stored circulating mother and daughter ions including oscillations in the decay curves of hydrogen‐like nuclei will be addressed. Future experiments with NUSTAR at FAIR will further extend our knowledge to the borderlines of nuclear existence.

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