Imaginary part of the C 9 - Be 9 single-folded optical potential

In a recent publication we have argued that using two very successful n-Be9 optical potentials [A. Bonaccorso and R. J. Charity, Phys. Rev. C 89, 024619 (2014)10.1103/PhysRevC.89.024619] and microscopic projectile densities, it is possible to build a single-folded (light-) nucleus-Be9 imaginary optical potential which is more accurate than a double-folded optical potential. By comparing to experimental reaction cross sections, we showed for B8,Li8, and C8 projectiles, that a very good agreement between theory and data could be obtained with such a "bare" potential, at all but the lowest energies where a small semimicroscopic surface term was added to the single-folded potential to take into account projectile breakup. In this paper we extend this study to the case of C9 projectiles and assess the sensitivity to the projectile density used. We then obtained the modulus of the nucleus-nucleus S matrix and parametrize it in terms of a strong-absorption radius Rs and finally extracted the phenomenological energy dependence of this radius. This approach could be the basis for a systematic study of optical potentials for light exotic nuclei scattering on light targets and/or parametrizations of the S matrix. Furthermore our study will serve to make a quantitative assessment of the description of the core-target part of knockout reactions, in particular their localization in terms of impact parameters.