Angular distribution analysis for quasi-elastic transfer reactions induced in209Bi targets with heavy ions

Abstract

An analysis of angular distributions for quasi-elastic transfer reactions is proposed. The formalism used is derived from the general treatment of multinucleon transfer in the limits of DWBA approximation. It appears that for heavy ions, the use of real potentials with real trajectories remains a good approximation in the window ofl space concerned with quasi-elastic transfer reactions. This analysis has been tested by a series of experimental data obtained by bombardment of209Bi targets by14N,16O,19F,40Ar and40Ca. For incident energies near the Coulomb barrier, the deflection angle depends strongly on the excitation energy of the system so that a window ofQ values leads to very wide angular distributions. A slow decrease of the radius parameter with the increase of theZ1Z2 product has been observed. This result can be correlated by an interaction distance (d=2.7–3fm) between half density radii of the two colliding nuclei.