Reduction of channel coupling effect on Li isotope elastic scatterings by glue-like behaviour of excess neutron.

The glue-like behavior of valence neutrons has been investigated in the Li isotopes. The ⁷Li nucleus is well known to be weakly bound system with the α + t cluster structure. By adding the valence neutrons, the reduction of the root-mean-square (RMS) radius of the proton density for the ⁷Li, ⁸Li and, ⁹Li nuclei is also well known from the viewpoint of the experimental data and theoretical approach. Elastic scattering cross sections of the Li isotopes on the ¹²C and ²⁸Si targets at E/A～50 MeV are calculated. We find the change of the channel coupling (CC) effect on elastic scatterings of such Li isotopes by the glue-like role of the valence neutrons. Finally, we realize that the valence neutrons stabilize the binding of core parts, and the CC effect related the core excitation is indeed reduced. [ABSTRACT FROM AUTHOR]