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We report first results of a systematic investigation of magnetic and electric hyperfine interactions of the nuclear probe 111Cd in intermetallic compounds of the rare earth (R)-gallium system by perturbed angular correlation (PAC) spectroscopy.R-Ga compounds with the stoichiometric ratio 1:1 were synthesized by arc-melting, characterized by X-ray diffraction (XRD) and doped with the PAC nucleus 111In/111Cd by diffusion.In the XRD analysis, samples prepared with heavy rare earth constituents R =Gd, Tb, Dy, Ho, Er and Tm were found to be single-phase orthorhombic RGa.Even so, most of the room temperature PAC spectra contained two fractions with different,axially asymmetric quadrupole interactions (QI) suggesting that the probe nucleus occupies both the R and the Ga site.For a test of this hypothesis, ab-initio calculations of the 111Cd QI at the two sides are presently under way.