Fusion in 9Be + 89Y system

There has been an interest recently in studying the influence of the breakup of weakly bound nuclei on fusion at near barrier energies. These studies are important in understanding astrophysical reactions and have also gained importance due to the availability of radioactive ion beams. The unstable weakly bound nuclei often have larger radii and low breakup threshold energies and it is proposed that this may affect fusion and other reaction channels. In particular the breakup of the projectile might lead to fusion suppression due to loss of flux to the breakup channel. On the other hand one can expect the fusion cross sections to be enhanced due to their larger radii and the coupling to internal degrees of freedom of colliding nuclei especially at sub-barrier energies. Thus enhancement or suppression of fusion will depend on the system and the energy range. In case of the stable weakly bound projectile 9Be, complete fusion suppression of ∼32% and ∼10% at near barrier energies have been reported for the 9Be + 208Pb and 9Be+144Sm systems respectively. With an aim to investigate this phenomenon for targets in the mass region A= 80 to 100 we have carried out a study of fusion reaction for the 9Be + 89Y system