The objective of present study is to explore the influence of breakup of weakly bound nuclei on fusion reactions induced by ${}^7\mathrm{Li}$ on light- and medium-mass targets ${}^{16}\mathrm{O}$, ${}^{27}\mathrm{Al}$, ${}^{28}\mathrm{Si}$, and ${}^{64}\mathrm{Ni}$ in above-barrier energy region. Continuum discretized coupled-channel calculations have been carried out to compute the total fusion (TF) and complete fusion (CF) cross sections using computer code fresco. It is found that inclusion of breakup couplings in the calculations enhance the agreement between data and TF cross sections. Also noticed that CF cross sections are suppressed with respect to TF cross sections for all the systems except ${}^7\mathrm{Li}+{}^{16}\mathrm{O}$ reaction, however, the degree of suppression is very small in comparison to that observed in reactions involving heavy targets. To obtain a clear systematic of CF suppression with target mass, calculations have been compared with UFF curve on the same scale and also a suppression factor ($\mathrm{S}{\mathrm{F}}_{\mathrm{CF}}$) has been estimated for each system. No suppression for ${}^{16}\mathrm{O}$ target is seen while for ${}^{27}\mathrm{Al}$ and ${}^{28}\mathrm{Si}$ CF cross sections are suppressed by 3% and around 6% suppression in CF is noticed for ${}^{64}\mathrm{Ni}$. Further, the estimated suppression factors have been compared with the calculated $\mathrm{S}{\mathrm{F}}_{\mathrm{CF}}$ for reactions involving medium- and heavy-mass targets (available in literature) and it exhibit that CF suppression factor increases initially with ${\mathrm{A}}_T$ and finally achieve a constant value (around 30%) for heavy-mass targets.

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• Nuclear fusion
• Nuclear reactions