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 HfF3+ after electron impact ionization provided intense and pure beams. Beams of 158-185Hf and short-lived isomers down to 1.1 s 177mHf were observed, but the method could be extended to reach even more exotic isotopes: down to about 154Hf (N=82) on the neutron-deficient side and up to neutron-rich 188Hf.
Koester, U., Arndt, O., Catherall, R., Correia, J. G., Crepieux, B., Eichler, R., Fernier, P., Fraile, L. M., Hennrich, S., Johnston, K., Lukic, S., Neuhausen, J., Nara Singh, B. S., Pfeiffer, B., & Siesling, E. (2007). ISOL beams of hafnium isotopes and isomers. The European Physical Journal Special Topics, 150(1), 293-296. https://doi.org/10.1140/epjst/e2007-00327-0