The scaling function f(ψ′) for medium and heavy nuclei with Zî€ =N
for which the proton and neutron densities are not similar is constructed
within the coherent density fluctuation model (CDFM) as a sum of the proton and
neutron scaling functions. The latter are calculated in the cases of 62Ni,
82Kr, 118Sn, and 197Au nuclei on the basis of the corresponding
proton and neutron density distributions which are obtained in deformed
self-consistent mean-field Skyrme HF+BCS method. The results are in a
reasonable agreement with the empirical data from the inclusive electron
scattering from nuclei showing superscaling for negative values of ψ′,
including those smaller than -1. This is an improvement over the relativistic
Fermi gas (RFG) model predictions where f(ψ′) becomes abruptly zero for
ψ′≤−1. It is also an improvement over the CDFM calculations made in
the past for nuclei with Zî€ =N assuming that the neutron density is equal
to the proton one and using only the phenomenological charge density.Comment: 4 pages, 1 figure, ReVTeX, accepted for publication in Phys. Rev.