Abstract
Angular distributions of elastic scatterings for the ${}^{19}\mathrm{F}{+}^{208}\mathrm{Pb}$ system were measured at six energies around the Coulomb barrier. By means of a phenomenological optical model analysis, it is found that the real and imaginary potentials show a pronounced energy dependence. The real parts of potentials extracted from the fusion data are similar to those from the elastic data. A comparison with the neighboring systems of ${}^{16}\mathrm{O}{+}^{208}\mathrm{Pb}$ and ${}^{16}\mathrm{O}{+}^{209}\mathrm{Bi}$ reveals that the effects of the ${}^{19}\mathrm{F}$ deformations in the entrance channel play an important role in the fusion reaction. Based on the deformed and energy dependent barrier penetration model, the calculation results of the fusion cross sections and mean-square spin distribution agree with the experimental data well. Furthermore, it is indicated that the enhancement of fusion cross sections is attributed to the dynamic polarization effects around the barrier, and to the static deformation effects further below the barrier.
Published Version
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