Long-range dynamic polarization potentials for <SUP>11</SUP>Li+<SUP>208</SUP>Pb and <SUP>6</SUP>He+<SUP>208</SUP>Pb systems

초록

We investigate the effects of long-range dynamic polarization on elastic cross sections for heavy-ion collisions which comprise the Coulomb dipole excitation (CDE) potential and the long-range nuclear (LRN) potential. To study these effects, we perform a chi(2) analysis for the elastic cross sections of Li-11 + Pb-208 and He-6 + Pb-208 systems using the long-range dynamic polarization potentials. For the CDE we formulate some empirical models to reproduce the experimental Coulomb dipole strength B(E1) distribution and apply to the collision of Li-11 and He-6. But the CDE potential turns out to be not enough to explain the experimental data relevant to the nuclei. It leads us to additionally take the LRN potential peculiar to these halo nuclei into account. Our model, which was constructed by adding the CDE and LRN potentials to the conventional short-range nuclear potential corrected by the Coulomb interaction, provides a good description of the experimental data. In particular, the surface type is shown to be more reasonable rather than the volume type in the LRN potential.

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