Abstract

The unreported hafnium isotope185Hf has been identified for the first time. Sources of185Hf prepared by 14-MeV neutron irradiation of tungsten followed by radiochemical separation have been studied. The new activity was identified by following the time variation of the γrays. The half-life of185Hf has been determined to be 3.5±0.6 min. In addition, a new 164.5±0.5keV γray was found and assigned to185Hf based on the measurements of transition energy and half-life.

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