PACS. 23.40 -Beta decay; electron and muon capture. PACS. 23.40H -Nuclear matrix eIements and nuclear structure inferred from beta decay. PACS. 21.605 -Hartree-Fock and random-phase approximations.

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Heavy-ion collisions often produce fusion barrier distributions with structures displaying a fingerprint of couplings to highly collective excitations. Similar distributions can be obtained from large-angle quasielastic scattering, although in this case, the role of the many weak direct-reaction channels is unclear. For 20Ne+90Zr, we have observed the barrier structures expected for the highly deformed neon projectile; however, for 20Ne+92Zr, we find significant extra absorption into a large number of noncollective inelastic channels. This leads to smearing of the barrier distribution and a consequent reduction in the “resolving power” of the quasielastic method

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