Hyperfine-Field Measurements on Sc in Fe and Re in Ni

Abstract

The hyperfine fields (${H}_{\mathrm{hf}}$) at $^{44}\mathrm{Sc}$ nuclei in an iron matrix and at $^{187}\mathrm{Re}$ nuclei in a nickel matrix are measured at room temperature using time differential perturbed ($\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$) angular correlation technique (TDPAC). The values obtained are ${H}_{\mathrm{hf}}$ $^{44}\mathrm{Sc}\mathrm{Fe} (300 ^{\ensuremath{\circ}}\mathrm{K})=\ensuremath{-}94\ifmmode\pm\else\textpm\fi{}3$ kOe and ${H}_{\mathrm{hf}}$ $^{187}\mathrm{Re}\mathrm{Ni} (300 ^{\ensuremath{\circ}}\mathrm{K})=\ensuremath{-}107\ifmmode\pm\else\textpm\fi{}3$ kOe. An external magnetic field of a few kOe was applied to polarize the host matrices of iron and nickel. Using the same TDPAC technique, the magnetic moments of the 68-keV state in $^{44}\mathrm{Sc}$ and of the 206-keV state in $^{187}\mathrm{Re}$ are measured. The values obtained are $+(0.345\ifmmode\pm\else\textpm\fi{}0.007){\ensuremath{\mu}}_{N}$ and $+(5.04\ifmmode\pm\else\textpm\fi{}0.14){\ensuremath{\mu}}_{N}$, respectively. The measured hyperfine-field values are compared with the predictions of the existing models.