Fusion dynamics around the Coulomb barrier
K. Hagino, N. Rowley, T. Ohtsuki, M. Dasgupta, J. O. Newton, D. J. Hinde
Abstract
We perform exact coupled-channels calculations, taking into account properly the effects of Coulomb coupling and the finite excitation energy of collective excitations in the colliding nuclei, for three Fm formation reactions, 37Cl + 209Bi, 45Sc + 197Au, and 59Co + 181Ta. For the 37Cl + 209Bi and 45Sc + 197Au reactions, those calculations well reproduce the experimental total fission cross sections, and a part of the extra-push phenomena can be explained in terms of the Coulomb excitations to multi-phonon states. On the other hand, for the heaviest system, the deep-inelastic collisions become much more significant, and the fission cross sections are strongly overestimated. We also discuss the surprisingly large surface diffuseness parameters required to fit recent high-precision fusion data for medium-heavy systems, in connection with the fusion supression observed in massive systems.
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