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Recoilless nuclear resonance absorption of the 6.2 keV y r~s of 181Ta, was used for the hyperfine intera?tions of dilute 181Ta impurities in the 5d, 4d, and 3d transition metals (Hf, Ta, W, Re, Os, Ir, Pt, Nb, Mo, Ru, Rh, Pd, V, and Ni) and the Ta compounds LiTa0 3 , NaTa0 3 , KTa0 3 , and TaC. Ratios of the nuclear parameters of the 6.2 keVexcited state (I= 9/2) to the ground state (I= 7/2) were derived from completely resolved magnetic and electric-quadrupole split spectra: g(9/2)/g(7/2) = 1.77±0.02 Q(9/2)/Q(7/2) = 1.133±0.010 and estimates for the mean-square nuclear charge radius were obtained: The measured isomer shifts covered a range of 110 mm/s, corresponding to 17,000 times the natural line-width or more than 1,600 times the best experimental line-width of the 6.2 keV transition. In addition, both the sign and the magnitude of the electric field gradient

Moessbauer spectroscopy of the 6.2 keV γ ray transition of <sup>181</sup>Ta