16 pages, 2 tables, 6 figures.-- PACS nrs.: 25.70.Bc; 25.60.Dz; 25.60.Gc; 25.60.Bx; 21.10.Gv; 27.20.+n.-- et al.The elastic scattering of He-6 on Pb-208 has been measured at laboratory energies of 14, 16, 18 and 22 MeV. These data were analyzed using phenomenological Woods-Saxon form factors and optical model calculations. A semiclassical polarization potential was used to study the effect of the Coulomb dipole polarizability. Evidence for long range absorption, partially arising from Coulomb dipole polarizability, is reported. The energy variation of the optical potential was found to be consistent with the dispersion relations which connect the real and imaginary parts of the potential.This work was supported in part by the MCyT (Spain) under projects FPA2005-04660, FPA2000-1592-c03-02, FPA2002-04181-C04-02(-03), FPA2003-05958, FPA2005-02379, by the Belgian Program P5/07 of Interuniversity Attraction Poles, and by the European Commission under contract No. HPRI-CT-1999-00110.Peer reviewed