Effects of radiation defects due to the $(n, \gamma)$ reaction on the hyperfine interaction of $^{181}Ta$ in $YFe_2$

Measurements have been made by the perturbed angular $\gamma \gamma$ correlation method, which have shown that the magnetic fields at the $^{181}Ta$ a nuclei at regular nodes in the Y sublattice differ from those at the defective positions produced by $(n, \gamma)$ reaction not only in magnitude but also in sign: $H_{reg}$ = -14,4 T, $H_{def}$ = + 62 T.