  The neutron distributions of Cs, Ba, Yb and Pb isotopes are described in the
framework of relativistic mean-field theory. The self-consistent ground state
proton and neutron density distributions are calculated with the relativistic
Hartree-Bogoliubov model. The binding energies, the proton and neutron radii,
and the quadrupole deformations are compared with available experimental data,
as well as with recent theoretical studies of the nuclear structure corrections
to the weak charge in atomic parity nonconservation experiments.
