Complete fusion in 7Li+144,152Sm reactions

Complete fusion cross sections for Li-7+ Sm-144,Sm-152 reactions have been measured at energies around the Coulomb barrier by offline gamma-counting technique. Measured cross sections for the above two reactions are found to be similar at energies well above the Coulomb barrier, however, at sub-barrier energies the cross sections for the Li-7+ Sm-152 system are much higher compared to the Li-7+ Sm-144 system, manifesting the effect of target deformation. Cross sections for the present reactions at above-barrier energies are found to be larger than previously measured reactions involving Li-6 projectile with the same targets, possibly due to smaller breakup probability of Li-7 than Li-6. Coupled-channels calculations show that the experimental fusion cross sections for both the systems are enhanced at subbarrier energies and suppressed at above-barrier energies compared to the respective one-dimensional barrier penetration model predictions. The calculations by different models show that the measured complete fusion cross sections at above-barrier energies are suppressed up to similar to 25% compared to the theoretical predictions. It also reveals that a large part of the suppression could be due to inelastic and transfer coupling.