Fusion of 6Li with 159Tb at near-barrier energies

Complete and incomplete fusion cross sections for Li-6 + Tb-159 have been measured at energies around the Coulomb barrier by the gamma-ray method. The measurements show that the complete fusion cross sections at above-barrier energies are suppressed by similar to 34% compared to coupled-channel calculations. A comparison of the complete fusion cross sections at above-barrier energies with the existing data for B-11,B-10 + Tb-159 and Li-7 + Tb-159 shows that the extent of suppression is correlated with the alpha separation energies of the projectiles. It has been argued that the Dy isotopes produced in the reaction Li-6 + Tb-159 at below-barrier energies are primarily due to the d transfer to unbound states of Tb-159, while both transfer and incomplete fusion processes contribute at above-barrier energies.