INTERACTION OF ALIGNED NA-23 WITH PB-206 AT THE COULOMB BARRIER - QUASI-ELASTIC SCATTERING, FUSION AND FISSION

The interaction of Na-23 with Pb-206 at energies around the Coulomb ba rrier for quasielastic scattering and for fusion followed by fission h as been investigated, partly with aligned projectiles. Quasielastic-sc attering data are required to determine the energy dependence of the s trength of the double-folding potential used in coupled-channel calcul ations. The real and imaginary part of the energy-dependent strength o f the potential turn out to be correlated by a dispersion relation. Th e fusion excitation function and the associated second-rank-tensor ana lyzing powers can be described parameter-free using the real energy-de pendent potential if channel coupling is considered as well. Finally, the transmission coefficients extracted from such calculations can be used as input for calculations of the fission angular distributions. D eviations are observed at the lowest bombarding energy.