Internal magnetic hyperfine fields at Hf nuclei in iron,cobalt and nickel hosts

Integral perturbed angular correlation technique has been used to measure the internal hyperfine magnetic fields at Hf nuclei in Fe, Co and Ni matrices. These represent a consistent set of measurements with diffused sources. The 9+/2 (208 keV) 9?/2 (113 keV) 7?/2 cascade in the decay of¹⁷⁷Lu→¹⁷⁷Hf was used for measurements. The results obtained are: $$begin{gathered} H_{Fe}^{Hf} = - 266 pm 47 kG, hfill H_{Co}^{Hf} = - 116 pm 18 kG, hfill H_{Ni}^{Hf} = - 118 pm 26 kG. hfill end{gathered} $$ These measurements are compared with previous results and discussed in terms of methods of source preparation.