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Simultaneous $\chi^{2}$ analyses previously made for elastic scattering andfusion cross section data for the $^{6}$Li+$^{208}$Pb system is extended to the$^{7}$Li+$^{208}$Pb system at near-Coulomb-barrier energies based on theextended optical model approach, in which the polarization potential isdecomposed into direct reaction (DR) and fusion parts. Use is made of thedouble folding potential as a bare potential. It is found that the experimentalelastic scattering and fusion data are well reproduced without introducing anynormalization factor for the double folding potential and that both the DR andfusion parts of the polarization potential determined from the $\chi^{2}$analyses satisfy separately the dispersion relation. Further, we find that thereal part of the fusion portion of the polarization potential is attractivewhile that of the DR part is repulsive except at energies far below the Coulombbarrier energy. A comparison is made of the present results with those obtainedfrom the Continuum Discretized Coupled Channel (CDCC) calculations and aprevious study based on the conventional optical model with a double foldingpotential. We also compare the present results for the $^7$Li+$^{208}$Pb systemwith the analysis previously made for the $^{6}$Li+$^{208}$Pb system.

physical review. c. nuclear physics/physical review. c, nuclear physics

Extended Optical Model Analyses of Elastic Scattering and Fusion Cross  Section Data for the 7Li+208Pb System at Near-Coulomb-Barrier Energies using  the Folding Potential