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Cross sections for elastic and inelastic scattering of the weakly-bound$^9$Be nucleus on a $^{120}$Sn target have been measured at seven bombardingenergies around and above the Coulomb barrier. The elastic angulardistributions are analyzed with a four-body continuum-discretizedcoupled-channels (CDCC) calculation, which considers $^9$Be as a three-bodyprojectile ($\alpha$ + $\alpha$ + n). An optical model analysis using the S\~aoPaulo potential is also shown for comparison. The CDCC analysis shows that thecoupling to the continuum part of the spectrum is important for the agreementwith experimental data even at energies around the Coulomb barrier, suggestingthat breakup is an important process at low energies. At the highest incidentenergies, two inelastic peaks are observed at 1.19(5) and 2.41(5) MeV.Coupled-channels (CC) calculations using a rotational model confirm that thefirst inelastic peak corresponds to the excitation of the 2$_1^+$ state in$^{120}$Sn, while the second one likely corresponds to the excitation of the3$_1^-$ state.

$^9$Be+$^{120}$Sn scattering at near-barrier energies within a four body model