Mössbauer Experiments onHf180and the Structure of the8−Two-Quasiparticle State

Abstract

The magnetic moment of the 1142-keV $8^{-}$ state of ${}_{}{}^{180}{}_{}{}^{}\mathrm{Hf}$ was deduced from the known hyperfine splitting of the isomeric state in (${\mathrm{Hf}}_{0.1}$ ${\mathrm{Zr}}_{0.9}$)${\mathrm{Fe}}_2$ and the hyperfine field in this compound. This field $H_{\mathrm{hf}}=-200\mathrm{}\pm 20$ kOe was obtained from Mössbauer experiments with the 93.3-keV $\gamma$ rays of ${}_{}{}^{180}{}_{}{}^{}\mathrm{Hf}$. The deduced result $\mu \left(8^{-}\right)=+(8.6\mathrm{}\pm 1.0){\mu }_N$ identifies the $8^{-}$ state as a virtually pure two-proton configuration.