Fusion of the borromean nucleus Be9 with a 197Au target at near-barrier energies

Abstract

To probe the role of the intrinsic structure of the projectile on subbarrier fusion, measurement of fusion cross sections has been carried out in a 9 Be + 197Au system in the energy range Ec.m./VB ≈ 0.82 to 1.16 using off-beam γ -counting method. Measured fusion excitation function has been analyzed in the framework of the coupled-channel approach using CCFULL code. It is observed that the coupled-channel calculations, including couplings to the inelastic state of the target and the first two states of the rotational band built on the ground state of the projectile, provide a very good description of the subbarrier fusion data. At above-barrier energies, the fusion cross section is found to be suppressed by ≈39(2)% as compared to the coupled-channel prediction. A comparison of reduced excitation function of 9 Be + 197Au with other x + 197Au shows a larger enhancement for 9 Be in the subbarrier region amongst Z = 2–5 weakly and tightly bound projectiles, which indicates the prominent role of the projectile deformation in addition to the weak binding.