  The present work reports results from systematic multiconfiguration
Dirac-Hartree-Fock calculations of electronic isotope shift factors for a set
of transitions between low-lying states in neutral zinc. These electronic
quantities together with observed isotope shifts between different pairs of
isotopes provide the changes in mean-square charge radii of the atomic nuclei.
Within this computational approach, different models for electron correlation
are explored in a systematic way to determine a reliable computational strategy
and to estimate theoretical error bars of the isotope shift factors.
