The role of orientation of nucleus symmetry axis in fusion dynamics

摘要

The dependence of the fusion excitation function on the orientation angles of the symmetry axis of deformed projectile- and target-nucleus relative to the beam direction is studied. The averaged over all orientations values of the fusion-fission cross sections obtained for O-16+U-238 and Ni-60+ Sm-154 reactions are compared with the experimental data. The capture and fusion cross sections for the O-16 + U-238 reaction are nearly the same while those are different for the Ni-60 + 154Sm reaction due to sufficient contribution of the quasifission events. The large values of the fusion cross section are obtained in the range 60 degrees < alpha(i) < 90 degrees of the orientation angles of the projectile- and target-nucleus. This phenomenon is explained by the dependence of the intrinsic fusion and quasifission barriers on the orientation angles of reactants. (c) 2005 Elsevier B.V. All rights reserved.