Abstract
Hafnium-184 was identified as a product of the irradiations of natural tungsten and enriched $^{186}\mathrm{W}$ with 92- and 200-MeV protons. The activity was produced by the $^{186}\mathrm{W}(p,3p)^{184}\mathrm{Hf}$ reaction. Mass-separated samples of $^{184}\mathrm{Hf}$ were used to study its $\ensuremath{\beta}$ and $\ensuremath{\gamma}$ decay. Some $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ and $\ensuremath{\beta}\ensuremath{-}\ensuremath{\gamma}$ coincidence measurements were performed. The following characteristics were observed: half-life, 4.12\ifmmode\pm\else\textpm\fi{} 0.05 h; $\ensuremath{\beta}$-ray end-point energies, 1100\ifmmode\pm\else\textpm\fi{} 30, 850\ifmmode\pm\else\textpm\fi{} 50, and 740\ifmmode\pm\else\textpm\fi{} 30 keV; and $\ensuremath{\gamma}$-ray energies, 41.4, 43.9, 47.9, 139.1, 181.0, and 344.9 keV. A decay scheme is proposed for $^{184}\mathrm{Hf}$ based on the experimental data and theoretical predictions for the excited level structure of $^{184}\mathrm{Ta}$.
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