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Complete fusion cross sections have been measured using the off-line γ -ray spectroscopy method for the 6 Li + 90 Zr system around barrier energies. Statistical and coupled-channel calculations have been performed to investigate the effect of coupling on complete fusion. It is observed that the complete fusion is suppressed by 34 ± 8% compared to the coupled channel predictions. The effect of breakup coupling is estimated using the continuum discretized coupled channels (CDCC) method and it is found to reduce the complete fusion probability. Contrary to earlier predictions, a universal behavior of complete fusion suppression factor for the 6 Li projectile with target charge is observed.

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Fusion and quasi-elastic scattering measurements have been carried out for 6,7 Li + 197 Au systems in the energy range E/V b ∼ 0.7 to 1.5. Coupled-channel calculations including coupling to inelastic states of the target and projectiles are able to explain an enhancement in measured fusion cross sections at energies below the barrier. At energies above the barrier the complete fusion cross sections are found to be suppressed compared to the coupled-channel predictions for both systems. A systematic comparison of fusion cross sections of the weakly bound stable nuclei 6,7 Li and halo nuclei 6,8 He on a 197 Au target is presented. Barrier distributions from quasi-elastic scattering are seen to shift towards higher energies with respect to fusion after inclusion of the breakup-α channel for both 6 Li and 7 Li.