Elastic Scattering and Breakup of 6Li: A New Type of Dynamical Polarization Potential

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Abstract
Elastic scattering and breakup of 99 MeV and 156 MeV 6Li ions from 28Si and 40Ca, respectively, are investigated on the basis of a microscopic coupled-channel (CC) method. The ground state and discretized breakup continuum states of 6Li and described by a totally antisymmetrized α-d cluster model. The CC potentials are given by doubly folding the M3Y effective nucleon-nucleon potential into the diagonal and transition densities of 6Li and the target density. The CC calculation with the bare normalization NR = 1.0 for the real potentials fits very well the experimental angular distributions of elastic scattering on account of large CC effects of the projectile breakup channels. The dynamical polarization potential due to the 6Li breakup is found to be strongly repulsive with a negligibly small imaginary part in the important surface region; this accounts for the strong reduction of the normalization factor, NR = 0.5 ∼ 0.6, required in usual double-folding single-channel calculations. The breakup of 6Li into both the α-d resonant and non-resonant states is found to occur in the extremely peripheral region much beyond the grazing distance and to proceed under a heavy interference between the one-step and multi-step breakup processes.

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