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.
