Using the Mossbauer effect in Sb 121 , measurements of the isomeric shift and quadrupole splitting have been made in a variety of antimony compounds. This data, along with similar results in Sn 119 by earlier authors, have been interpreted using Hartree-Fock self-consistent-field atomic wave functions. New values are: (Sr/r) (Sn 119 ) = (1.2=b0.4) X10~4, (?(Sn 119 ) = (-0.06d=0.02) b, (dr/r) (Sb 121 ) = (-8.5±3.0) X10~4, and Q(Sb 121 f+) = (-0.26=1=0.1) b. The interpretation for Sn extends the work of Shpinel, Boyle, and Flinn; the result (dr/r) (Sn 119 ) >0 is opposite to a conclusion recently reached by GoPdanskii. The value for (8r/r) (Sb 121 ) is much larger than that anticipated by a simple nuclear model.
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