Hyperfine Interaction and Isomeric Shift inPt195

Abstract

Using the Mössbauer technique the first-excited-state $g$ factor for ${\mathrm{Pt}}^{195}$ has been determined to be -0.41 ±0.03. The following magnetic fields at the Pt nucleus were found: in an Fe lattice, 1.19±0.04 MG; in a Co lattice, 0.86±0.03 MG; and in a Ni lattice, 0.36±0.04 MG. Isomeric shifts have been detected in a number of compounds and alloys and have been interpreted to imply that the mean square radius for the ${\mathrm{Pt}}^{195}$ nucleus in the first excited state is smaller than in the ground state.