Experiments with intense secondary beams of radioactive ions

New techniques at ISOLDE-2

Nuclear Data Sheets for A = 124

http://cds.cern.ch/record/134299/files/198010366.pdf

Intense Beams of Radioactive Halogens Produced by Means of Surface Ionization

Total decay energies have been measured for a number of neutron-deficient Rb and Cs isotopes, as well as for some neutron-rich isotopes of Fr and Ra. Mass separated sources were produced at the ISOLDE on-line separator at CERN. By applying two differentβ-γ coincidence methods,Q values or their lower limits were determined for76–78Rb,80Rb,121–124Cs,222Fr,224–226Fr,229Ra-229Ac. For many of these nuclei, the atomic mass excesses could be derived, allowing the comparison of masses of far unstable nuclei with predictions from mass formulae. The odd-odd nuclei76Rb and78Rb appear to be 1−1 1/2 MeV more strongly bound than expected from the systematics.

E. Roeckl

Papers

Short-lived isotopes of alkali and alkaline-earth elements studied by on-line isotope separator techniques