Fusion of ${}^6$Li with ${}^{159}$Tb} at near barrier energies

Abstract

Complete and incomplete fusion cross sections for ${}^6$Li+${}^{159}$Tb have been measured at energies around the Coulomb barrier by the ${\hat{I}}^3$-ray method. The measurements show that the complete fusion cross sections at above-barrier energies are suppressed by $\sim$34% compared to the coupled channels calculations. A comparison of the complete fusion cross sections at above-barrier energies with the existing data of ${}^{11,10}$B+${}^{159}$Tb and ${}^7$Li+${}^{159}$Tb shows that the extent of suppression is correlated with the $\hat{I}\pm$-separation energies of the projectiles. It has been argued that the Dy isotopes produced in the reaction ${}^6$Li+${}^{159}$Tb, at below-barrier energies are primarily due to the $d$-transfer to unbound states of ${}^{159}$Tb, while both transfer and incomplete fusion processes contribute at above-barrier energies.

Phys. Rev. C (accepted)