Nuclear Zeeman Effect in ${\mathrm{W}}^{182}$ in Iron

The Mössbauer effect in the 100-keV 2+→0+ transition in ${\mathrm{W}}^{182}$ was observed with dilute tungsten in iron alloy absorbers with concentrations from 0.5-5.0 at.%W at 4.2°K. From the Zeeman spectra in external longitudinal magnetic fields, the $g$ factor of the first excited 2+ state was found to be 0.22±0.02, and the hyperfine field at tungsten nuclei in iron was found to be -708±25 kOe. The hyperfine interaction for ${\mathrm{Fe}}^{57}$ in these alloys was also measured, and the results are compared with measurements on alloys of Fe with other $5d$ impurities and with neutron diffraction measurements.