On the magnetic hyperfine field at Hf in iron and the gyromagnetic factors g K and g R of the 624 rotational band of 177 Hf

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 γ-γ 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 ± 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 = 9/2 + [624] rotational band. The measurement of the integral rotation of the 105-208 keV cascade yielded the value of g (321) = -0.113 ± 0.038. The combination of the g factor and the M 1/ E 2 mixing ratios of the Δ 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 = -0.18 ± 0.05 and g R = 0.19 ± 0.05.