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We discuss the role of two-neutron transfer processes in the fusion reactionof the $^{9,11}$Li + $^{208}$Pb systems. We first analyze the $^{9}$Li +$^{208}$Pb reaction by taking into account the coupling to the $^{7}$Li +$^{210}$Pb channel. To this end, we assume that two neutrons are directlytransferred to a single effective channel in $^{210}$Pb and solve thecoupled-channels equations with the two channels. By adjusting the couplingstrength and the effective $Q$-value, we successfully reproduce theexperimental fusion cross sections for this system. We then analyze the$^{11}$Li + $^{208}$Pb reaction in a similar manner, that is, by taking intoaccount three effective channels with $^{11}$Li + $^{208}$Pb, $^{9}$Li +$^{210}$Pb, and $^{7}$Li + $^{212}$Pb partitions. In order to take into accountthe halo structure of the $^{11}$Li nucleus, we construct the potential between$^{11}$Li and $^{208}$Pb with a double folding procedure, while we employ aWood-Saxon type potential with the global Aky\"uz-Winther parameters for theother channels. Our calculation indicates that the multiple two-neutrontransfer process plays a crucial role in the $^{11}$Li + $^{208}$Pb fusionreaction at energies around the Coulomb barrier.

Coupled-channels analyses for $^{9,11}$Li + $^{208}$Pb fusion reactions with multi-neutron transfer couplings