The role of the tightly bound core in the refractive scattering of 17F+12C

Abstract

The refractive scattering of 17F+12C is analyzed systematically by using the optical model with the cluster folding potentials. First of all, the applicability of the cluster folding approach is validated by analyzing the elastic scattering data of 13C+12C and 12C+12C at 20 A MeV. To perform the optical model calculations of 17F+12C, the less ambiguous optical potentials of 16O+12C and the global optical potential of p+12C are used to give the cluster folding potentials. Apart from the reproduction of the experimental data of the elastic scattering of 17F+12C at 10 A MeV, the Airy patterns are noticeable from about 10 to 40 A MeV. For comparison, the optical model calculations of 17O+12C at the same energies per nucleon are also performed through the cluster folding approach, of which the results are very similar to those of 17F+12C. For both 17F+12C and 17O+12C, the energy dependence of the Airy minima is extracted and compared with that in the case of 16O+12C. It is found that the Airy minima characteristic of 17F+12C is nearly identical with that of 17O+12C and similar to that of 16O+12C, which indicates the strong contributions from the 16O core to the appearance of the nuclear rainbow effects in 17F scattering. At last, the calculated total reaction cross sections are compared with the strong absorption model, which verifies the reasonableness of the present optical model calculations.