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Surface Components of the Nuclear Symmetry Energy

The Coherent Density Fluctuation Model (CDFM) is used to calculate the volume (aA) and surface (a S A) contributions (and their ratio) to the nuclear symmetry energy (NSE). Starting with the global values for parameters for infinite nuclear matter, our approach makes it possible to derive their corresponding values in finite nuclei. Two energy-density functionals (EDF) for nuclear matter, those of Brueckner and Skyrme are used. The weight function in CDFM is calculated using the proton and neutron densities from the selfconsistent HF+BCS method with Skyrme interactions. The obtained values of aA , a S A, and their ratio for the Ni, Sn, and Pb isotopic chains, as well as isotopic sensitivity are presented and discussed. The results are compared with those of other theoretical models, as well as with available experimental data obtained from analyses of nuclear properties, such as binding energies, neutronskin thicknesses, excitation energies to isobaric analog states and others.