Sub-barrier fusion of 11Li with 208Pb

We have extended our previous measurements of the complete fu-

sion and breakup fusion processes in the interaction of 11 Li with spherical

208 Pb with four new measurements at laboratory frame energies of 11 Li of 26.1

to 32.7 MeV in the sub-barrier region. (Previous measurements were for Elab

= 28.6 to 39.9 MeV.) Comparison of the complete fusion cross sections with

coupled channel, TDHF and other models for these collisions reveals signi-

cant dierences between the measured and calculated values. The implications

of this nding for the fusion/breakup of halo nuclei are discussed.