Suppression of the elastic scattering cross section for the Ne17+Pb208 system

We investigated the elastic scattering, inelastic scattering, breakup reactions, and total fusion reactions of the ¹⁷Ne+²⁰⁸Pb system using the extended optical model (OM) and a coupled channel (CC) approach. The aim of this study is to elucidate the suppression of the elastic cross section that is invisible in proton-rich nuclei, such as ⁸B and ¹⁷F projectiles, but appears in neutron-rich nuclei, such as ¹¹Li and ¹¹Be projectiles. The simultaneous χ² analysis of the ¹⁷Ne+²⁰⁸Pb system revealed that this suppression was primarily caused by the nuclear interaction between the projectile and the target nucleus, rather than the strong Coulomb interaction observed in neutron-rich nuclei. Moreover, the contributions of the Coulomb excitation interaction due to the two low-lying $E2$ resonance states were relatively small. In addition, the contribution of the direct reaction, comprising the inelastic scattering and breakup reaction cross sections, accounted for almost half of the total reaction cross section. Finally, we performed the CC calculation using the parameters obtained from the OM calculation; however, the present CC calculations could not properly explain the ¹⁵O production cross section.