Scattering of⁶He at energies around the Coulomb barrier

We have measured elastic cross sections of the scattering of 6He at
\nELab = 14, 16, 17, 18, 22 MeV on 208Pb in the angular ranges of 20± − 64± and
\n135± − 170±. A significant amount of 4He events is found at energies well below the
\nCoulomb barrier, that becomes dominant above it. Optical Model calculations have
\nbeen performed including a dynamic polarization potential. Very large imaginary diffuseness
\nparameter is needed in order to describe the experimental distributions