Abstract
Using the above-barrier fusion probabilities of Berriman and the appropriate extra-push energies, we re-investigate the quasi-fission dynamics of reactions leading to the compound nucleus 220 Th. A consistent description is obtained in terms of the entrance- channel barriers that are known to determine the initial capture process. The different dynamical deformations that give rise to these barriers significantly influence the potential- energy landscapes onto which the captured system is injected.
Highlights
For very heavy systems, the formation of evaporation residues (ER) via heavy-ion reactions is an extremely complicated process
For heavy systems with collective internal degrees of freedom in the target and/or projectile, the capture stage is complicated by the existence of a broad “distribution” of Coulomb barriers [1, 2]
The experimental ER for the different reactions have been multiplied by the factors given in the legend in order to account for differing losses due to quasi-fission
Summary
The formation of evaporation residues (ER) via heavy-ion reactions is an extremely complicated process. For heavy systems (high Z1Z2) with collective internal degrees of freedom in the target and/or projectile, the capture stage is complicated by the existence of a broad “distribution” of Coulomb barriers [1, 2]. Our aim in this contribution is to investigate whether the configurations corresponding to those barriers might play a role in determining the probability of quasi-fission.
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