Magnetic Moment Distributions in Tl Nuclei

The distributions of nuclear magnetic moment gives rise to small changes of the hyperfine structure. This work presents quantitative calculations linking observed ``hyperfine anomalies'' in Tl to changes in the magnetic moment distribution, with consistent results for the $6p$ and $7s$ states. It is found that the change in magnetic radius between the two stable isotopes is about twice as large as the corresponding change for the charge distribution. This may have some implications for the ``Schiff moments'' used in the interpretation of experiments searching for P and T violating effects.