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Pré-Publication, Document De Travail Année : 2007

Fusion Process Studied with Pre-equilibrium GDR in TDHF Theory

Résumé

The equilibration of macroscopic degrees of freedom during the fusion of heavy nuclei, like the charge and the shape, are studied in the Time-Dependent Hartree-Fock theory. The pre-equilibrium Giant Dipole Resonance (GDR) is used to probe the fusion path. It is shown that such isovector collective state is excited in N/Z asymmetric fusion and to a less extent in mass asymmetric systems. The characteristics of this GDR are governed by the structure of the fused system in its pre-equilibrium phase, like its deformation, rotation and vibration. In particular, we show that a lowering of the pre-equilibrium GDR energy is expected as compared to the statistical one. Revisiting experimental data, we extract an evidence of this lowering for the first time. We also quantify the fusion-evaporation enhancement due to gamma-ray emission from the pre-equilibrium GDR. This cooling mechanism along the fusion path may be suitable to synthesize in the future super heavy elements using radioactive beams with strong N/Z asymmetries in the entrance channel.
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Dates et versions

hal-00139795 , version 1 (03-04-2007)
hal-00139795 , version 2 (11-07-2007)
hal-00139795 , version 3 (24-08-2007)

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Cédric Simenel, Philippe Chomaz, Gilles de France. Fusion Process Studied with Pre-equilibrium GDR in TDHF Theory. 2007. ⟨hal-00139795v1⟩
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