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Etude de l'influence de l'énergie de correction de couches sur les réactions nucléaires menant à la région des noyaux superlourds

Abstract : The aim of this PhD is to study the influence of shell correction energy on the desexcitation of superheavy nuclei. For that purpose, a new statistical code, called Kewpie2, which is based on an original algorithm allowing to have access to very weak probabilities, was developed. The results obtained with Kewpie2 were compared to the experimental data on residue cross sections obtained by cold fusion (Z=108 to Z=113) and by hot fusion (Z=112, Z=114 and Z=116), as well as data on fission times (Z=114, Z=120 and Z=126). Constraints on the microscopic structure of the studied nuclei were obtained by means of the shell correction energy. By adjusting the intrinsic parameters of the models of fusion in order to reproduce the data on the fusion cross sections, this study show the necessity of decreasing very strongly the shell correction energy predicted by the calculations of Møller and Nix, during the study of the residues cross sections as well for the nuclei produced by cold fusion as by hot fusion. On the other hand, during the confrontation of the results of Kewpie2 to the data on mean fission times, it is rather advisable to increase it. A shift of the proton shell closure predicted for Z=114 by the calculations of Møller and Nix towards larger Z would allow to explain these opposite conclusions. In this thesis, we also have shown the significant influence of the inclusion of isomeric states on fission times for the superheavy nuclei.
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Submitted on : Friday, December 14, 2007 - 9:47:26 AM
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A. Marchix. Etude de l'influence de l'énergie de correction de couches sur les réactions nucléaires menant à la région des noyaux superlourds. Physique Nucléaire Théorique [nucl-th]. Université de Caen, 2007. Français. ⟨tel-00197012⟩

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