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\item[Background]Heavy-ion reactions from barrier up to Fermi energy.\item[Purpose]Reaction and fusion cross sections determination. Fusionreactions induced by $^{129}Xe$ projectiles on $^{nat}Sn$ targets for energiesranging from $8$ A.MeV to $35$ A.MeV were measured with the INDRA$4\pi$-array.\\ The evaluation of the fusion/incomplete fusion cross sectionsfor the incident energies from 8 to 35 A.MeV is the main purpose of this paper.\item[Method] The reaction cross sections are evaluated for each beam energythanks to INDRA $4\pi$-array. The events are also sorted in order to focus thestudy on a selected sample of events, in such a way that the fusion/fusionincomplete cross section is estimated. \item[Results] The excitation functionof reaction and fusion cross sections were measured for the heavy and nearlysymmetric system $^{129}Xe + ^{nat}Sn$ from 8 to 35 A.MeV.  \item[Conclusions] The fusion-like cross-sections evaluated show a goodagrement with a recent systematics for beam energies greater than 20 A.MeV. Forlow beam energies the cross-section values are lower than the expected ones. Aprobable reason for these low values is in the fusion hindrance at energiesabove/close the barrier.

Reaction and fusion cross sections for the near-symmetric system $^{129}Xe+^{nat}Sn$ from $8$ to $35$ $AMeV$