Abstract
A theoretical study of the influence of configuration mixing on elastic scattering cross section is performed for the system 16O + 27Al at 100 MeV. A simple twostate model space, including the 27Al 5/2+ ground and 5/2+ excited state at 2.73 MeV, is used in the coupled channel equations. The results indicate that even a weak degree of mixing is able to sizeably affect the elastic cross section, determining mainly a damping of Fraunhofer oscillations, as observed in the experiments.
Highlights
High precision elastic and inelastic angular distributions have been measured for the 16O + 27Al system at an incident energy of 100 MeV [1]
The failure of Optical Model (OM) calculations with the same optical potential in reproducing the measured cross sections reveals the crucial role of inelastic couplings in the rainbow formation
An analysis in terms of realistic configuration mixing of the 27Al 5/2+ ground and the 5/2+ excited state at 2.73 MeV is proposed in order to explain the phenomenon of the damping of
Summary
High precision elastic and inelastic angular distributions have been measured for the 16O + 27Al system at an incident energy of 100 MeV [1]. The data analysis, based on parameter-free Coupled Channel (CC) calculations [5] and the São Paulo double folding potential, (SPP) [6] has confirmed the formation of a nuclear rainbow [7]. The failure of Optical Model (OM) calculations with the same optical potential in reproducing the measured cross sections reveals the crucial role of inelastic couplings in the rainbow formation.
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