## Abstract

The induced magnetic hyperfine field acting on $^{177}$Hf nuclei implanted into an iron foil by means of an isotope separator was determined by measuring the integral rotation of the 208-113 keV $\gamma$-$\gamma$ directional correlation. By using the previously known values of the g factor and the lifetime of the 113 keV state of $^{177}$Hf a value of -(286 $\pm$ 40) kOe was obtained for the effective internal field. The same source was used to measure the g factor of the 321 keV excited level in $^{177}$Hf, which is the ground state of the K = $\frac{9}{2}^+$ [624] rotational band. The measurement of the integral rotation of the 105-208 keV cascade yielded the value of g(321) = -0$\cdot$113 $\pm$ 0$\cdot$038. The combination of the g factor and the M1/E2 mixing ratios of the $\Delta$I = 1 transitions in the [624] rotational band in $^{177}$Hf, which were determined from directional correlation measurements employing Ge(Li) detectors, gave g$_K$ = -0$\cdot$18 $\pm$ 0$\cdot$05 and g$_R$ = 0$\cdot$19 $\pm$ 0$\cdot$05.