Scattering of He-6 at energies around the Coulomb barrier
Sánchez-Benítez, AM Escrig, D Álvarez, MAG Andrés, MV Angulo, C Borge, MJG Cabrera, J Cherubini, S Espino, JM Figuera, P Freer, M García-Ramos, JE Gómez-Camacho, J Gulino, M Kakuee, OR Martel, I Metelco, C Moro, AM Rahighi, J Rusek, K Smirnov, D Tengblad, O Van Duppen, Piet Ziman, V #
Iop publishing ltd
Journal of Physics G: Nuclear and Particle Physics vol:31 pages:S1953-S1958
We have measured elastic cross sections of the scattering of 6 He at E-Lab 14, 16, 17, 18 and 22 MeV on Pb-208 in the angular ranges of 20 degrees-64 degrees and 135 degrees-170 degrees. A significant amount of He-4 events is found at energies well below the Coulomb barrier, that becomes dominant above it. Optical model calculations have been performed including a dynamic polarization potential. Very large imaginary diffuseness parameter is needed in order to describe the experimental distributions.