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Contribution à la Description Macroscopique des Phénomènes Nucléaires de Fusion, Fission et Fragmentation

Abstract : The nuclear phenomena of transition between one and two-body systems (fusion, fission and fragmentation) are studied within a macroscopic model taking account both the repulsive Coulomb forces, the attractive surface tension forces, the nuclear proximity forces and the friction forces. A two-parameter shape sequence (distance between the centres of mass and asymmetry) is defined to study the fusion path and the fission path through compact and creviced shapes. The potential barriers have an external maximum corresponding to two separated spheres. For the heavy systems, the barriers have two peaks separated by a deep minimum, due to the proximity forces. In all the nuclear mass range, the fusion cross sections are well reproduced. For the heaviest systems, the friction forces hinder strongly the fusion and an additional kinetic energy is necessary to jump over the barrier. The fission path is compatible with most of the experimental results: barrier heights, fission of the actinides, scission barrier, quasi-fission and cold fission events, critical angular momentum, translational kinetic energy and absence of superheavy nuclei. The projectile fragmentation in the target field leads to the emission of two particles in peripheral collisions: a strongly slackened fragment (0.6 Vbeam) and a quasi-projectile. In the more central collisions, the slackened fragment sticks at the target and only the quasi-projectile is detected.
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Contributor : Dominique Girod <>
Submitted on : Friday, January 31, 2014 - 2:20:48 PM
Last modification on : Tuesday, February 11, 2020 - 10:26:05 AM
Long-term archiving on: : Sunday, April 9, 2017 - 4:38:20 AM


  • HAL Id : tel-00940116, version 1


G. Royer. Contribution à la Description Macroscopique des Phénomènes Nucléaires de Fusion, Fission et Fragmentation. Physique Nucléaire Théorique [nucl-th]. Université de Nantes, 1986. Français. ⟨tel-00940116⟩



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