We have measured the hyperfine-structure separations and nuclear magnetic moments of (2.70-day) Au198 and (3.15-day) Au199 in the S122 state, using the atomic-beam magnetic-resonance method. We also measured the ratios of the electronic g factor of gold to those of potassium and cesium. The results are, for Au198 (I=2), Δν=21450.7167(4) MHz, μI(uncorr)=+0.5842(4) nm; and for Au199 (I=32), Δν=10962.7227(3) MHz, μI(uncorr)=+0.2673(7) nm. The results for the g-factor ratios are: gJ(Au)gJ(K)=1.000504(2) and gJ(Au)gJ(Cs)=1.000381(2). These values yield the following hyperfine-structure anomalies: Δ198197=8.53(8)% and Δ199197=3.7(2)%. Second-order corrections to the hyperfine structure are shown to be negligible. The nuclear results are interpreted in terms of the shell model, with allowance made for configuration mixing.
Vanden Bout, Paul A.; Ehlers, Vernon J.; Nierenberg, William A.; and Shugart, Howard A., "Hyperfine-structure separations, nuclear magnetic moments, and hyperfine-structure anomalies of gold-198 and gold-199" (1967). University Faculty Publications. 460.