Abstract
The production of ISOL beams of hafnium is described. Radioactive Hf isotopes were produced at ISOLDE by 1.4 GeV proton-induced spallation in Ta and W foils. Chemical evaporation in form of HfF4 and mass separation in the molecular sideband HfF + after electron impact ionization provided intense and pure beams. Beams of 158−185 Hf and short-lived isomers down to 1.1 s 177m Hf were observed, but the method could be extended to reach even more exotic isotopes: down to about 154 Hf (N = 82) on the neutron-deficient side and up to neutron-rich 188 Hf.
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