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<dc:title xml:lang="fr">Essai sur les symétries géométriques et les transitions de forme du noyau de l'atome</dc:title>
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<dc:subject xml:lang="fr">Théorie du champ moyen nucléaire</dc:subject>
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<dc:subject xml:lang="fr">Approximation adiabatique</dc:subject>
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<dc:subject xml:lang="en">Symmetry point groups</dc:subject>
<dc:subject xml:lang="en">Nuclear mean-field theory</dc:subject>
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<dcterms:abstract xml:lang="fr">Les symétries géométriques en usage en physique nucléaire sont assez peu variées, essentiellement la symétrie de l’ellipsoïde triaxial. On propose donc une méthode rigoureuse permettant d’étudier l’évolution et la possibilité de l’existence de symétries nouvelles dont la symétrie tétraédrique. Le formalisme de l’équation de SCHRÖDINGER est replacé dans le cadre des espaces de RIEMANN. Ce formalisme est utilisé dans le contexte du noyau de l’atome où l’on applique la théorie du champ moyen alliée à l’approximation adiabatique. Le noyau est le siège de deux catégories de mouvements adiabatiquement séparés, le mouvement rapide des nucléons dans le champ moyen, et le mouvement collectif modifiant lentement le champ moyen. Le second est régi par une équation de SCHRÖDINGER collective qui prend place dans un espace dont la métrique est donnée par le tenseur de masse. L’étude de la géométrie du noyau est alors calculable à l’aide de deux grands programmes développés dans le cadre de la thèse.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The geometrical symmetries used in nuclear physics are not very diversified, essentially the symmetry of the triaxial ellipsoid. One proposes therefore a rigourous method allowing to study the temporal evolution and the possibility of the existence of new symmetries among them the tetrahedral symmetry. The formalism of SCHRÖDINGER equation is reformulated in the framework of RIEMANN’s spaces. This formalism is used in the context of the atomic nucleus where one applies the mean-field theory combined with the adiabatic approximation. The nucleus is the terrain of two types of motions adiabatically separated, the quick motion of the nucleons in the mean-field and the collective motion modifying slowly the meanfield. The second one is governed by a collective SCHRÖDINGER equation written down in a space whose metric is given by the mass tensor. The study of the nucleus geometry is then computable with the help of two big programs developped within the thesis.</dcterms:abstract>
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