Fusion-evaporation cross-sections for Ca-48+Sm-154 near the Coulomb barrier

摘要

Measurements of fusion-evaporation cross-sections for the system Ca-48 + Sm-154 have been performed in the sub- and near-barrier energy range. Barrier-passing cross-sections have been obtained by adding recently measured capture-fission cross-sections at the same energies, and the barrier distribution for capture has been extracted. The data have been analyzed within a coupled-channel model, and a large subbarrier cross-section enhancement is observed, due to the ground-state prolate deformation of Sm-154. The Ca-48 + Sm-154 capture cross-sections are compared to existing data on O-16 + W-186 fusion. leading to the same CN. where a few higher-energy points have also been measured. The evaporation residue cross-sections for the two systems above the barrier indicate that complete fusion is inhibited for Ca-48 + Sm-154 by approximate to 40% in that energ, region, with respect to O-16 + W-186.