THE HYPERFINE-STRUCTURE OF BI-209(83)82+

The hyperfine structure splitting of the ground state of hydrogen-like Bi-209 is calculated for an extended nuclear charge distribution. The probability density of the odd proton in Bi-209 is taken into account explicitly in order to compute the effect of an extended magnetizatio n distribution on the energy splitting. The probability density of the odd proton is deduced from a mean-field model and the magnetization c orrection is evaluated within the Bohr-Weisskopf formalism. We obtaine d a transition wavelength of DELTAlambda = 242.3 nm. An estimate for t he QED corrections is provided.