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With the aim to investigate the inuence of the breakup channel on different  reaction channels, the elastic scattering and fusion of 9Be with the  medium mass target 89Y has been studied at near barrier energies.  Optical model analysis of the elastic data has been carried out and a dispersion  relation applied to the real and imaginary potentials to investigate their  energy dependence from which the presence of breakup threshold anomaly has been  observed. Complete fusion (CF) cross sections, obtained for  9Be+89Y system, are found to be suppressed by (20 ±  5)% as compared to the coupled-channels calculations without breakup coupling.  This observation has been further conrmed by comparing these cross sections  with those for the 4He+93Nb and  12C+89Y systems, where fusion is induced by a tightly  bound projectile and forms a nearby compound nucleus to that formed by  9Be+89Y. Results from the breakup coupling done in  continuum discretized coupled-channels calculations show that the elastic cross  sections thus obtained, which also t the experimental elastic cross sections,  are enhanced compared to the uncoupled calculations which implies a reduction in  absorption/fusion cross sections. These enhanced cross sections suggest that the  dynamic polarization potential produced due to breakup coupling is repulsive in  nature. Thus the effective (bare+polarization) potential around the barrier  becomes less attractive leading to the absence of the normal threshold  anomaly

Study of reactions with the weakly bound projectile9Be with89Y