Atomic calculations of hyperfine structure anomaly in gold

The hyperfine anomaly in heavy atoms and its role in precision atomic searches for new physics

“…We note that the singleparticle model also works very well for Ag and it works reasonably well for Yb + and Au, including reproducing the (atypical) sign of the effect for the latter. Our calculations for Au are in good agreement with previous calculations [64,65], though we use a simplified model (see also [66][67][68]). In the ball model, the only difference in the BW effect between isotopes comes from changing the nuclear radius, similarly to the differential Breit-Rosenthal effect, so the calculated anomaly is always small and the model generally cannot produce the observed anomalies.…”