  The volume and surface components of the nuclear symmetry energy (NSE) and
their ratio are calculated within the coherent density fluctuation model
(CDFM). The estimations use the results of the model for the NSE in finite
nuclei based on the Brueckner energy-density functional for nuclear matter. In
addition, we present results for the NSE and its volume and surface
contributions obtained by using the Skyrme energy-density functional. The CDFM
weight function is obtained using the proton and neutron densities from the
self-consistent HF+BCS method with Skyrme interactions. We present and discuss
the values of the volume and surface contributions to the NSE and their ratio
obtained for the Ni, Sn, and Pb isotopic chains studying their isotopic
sensitivity. The results are compared with estimations of other approaches
which have used available experimental data on binding energies, neutron-skin
thicknesses, excitation energies to isobaric analog states (IAS) and also with
results of other theoretical methods.
