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<dc:title xml:lang="fr">Calcul de sections efficaces du système à trois corps (e − , e + , p̄) avec les équations de Faddeev-Merkuriev</dc:title>
<dcterms:alternative xml:lang="en">Cross sections calculation of the (e − , e + , p̄) three body system with the Faddeev-Merkuriev equations</dcterms:alternative>
<dc:subject xml:lang="fr">Canaux couplés</dc:subject>
<dc:subject xml:lang="fr">Merkuriev</dc:subject>
<dc:subject xml:lang="fr">Faddeev</dc:subject>
<dc:subject xml:lang="fr">Ab-initio</dc:subject>
<dc:subject xml:lang="fr">Trois corps</dc:subject>
<dc:subject xml:lang="fr">Résonance de Feshbach</dc:subject>
<dc:subject xml:lang="fr">Oscillation de Gailitis-Damburg</dc:subject>
<dc:subject xml:lang="fr">Antihydrogène</dc:subject>
<dc:subject xml:lang="fr">Positronium</dc:subject>
<dc:subject xml:lang="fr">Dégénérescence</dc:subject>
<dc:subject xml:lang="fr">GBAR</dc:subject>
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<dc:subject xml:lang="en">Ab-initio</dc:subject>
<dc:subject xml:lang="en">Three-body</dc:subject>
<dc:subject xml:lang="en">Feshbach resonances</dc:subject>
<dc:subject xml:lang="en">Gailitis-Damburg oscillations</dc:subject>
<dc:subject xml:lang="en">Antihydrogen</dc:subject>
<dc:subject xml:lang="en">Positronium</dc:subject>
<dc:subject xml:lang="en">Degeneracy</dc:subject>
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<tef:elementdEntree autoriteExterne="027480704" autoriteSource="Sudoc">Sections efficaces (physique nucléaire)</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="03140071X" autoriteSource="Sudoc">Problème à trois corps</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Cette thèse est consacrée au calcul de sections efficaces de réactions impliquant le système à trois corps (e − , e + , p̄) à des énergies représentatives de l’expérience GBAR. Deux approches théoriques ont été utilisées. La première, appelée méthode des canaux couplés, permet de traiter le système dans un cadre théorique plus simple. La deuxième, basée sur le formalisme rigoureux des équations de Faddeev-Merkuriev, a permis le calcul explicite des sections efficaces. Une des difficultés majeures provient de la dégénérescence accidentelle du premier état excité des atomes d’antihydrogène et de positronium. Le traitement de cette dégénérescence a été réalisé dans un premier temps dans le formalisme de canaux couplés avant d’être adapté au code des équations de Faddeev-Merkuriev. Dans ce document, nous discutons les sections efficaces dans le contexte de l’expérience GBAR et interprétons les phénomènes résonnants mis en évidence, les résonances de Feshbach et les oscillations de Gailitis-Damburg.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis is dedicated to cross section calculations involving the three body system (e − , e + , p̄) at representative energies for the GBAR experiment. Two different theoretical formalisms have been used. The first one, the close coupling method, allows to study the system in a more simple and schematic theoretical frame. The second, based on the mathematically rigorous formalism of the Faddeev-Merkuriev equations, is used to compute the explicit cross sections. One of the major difficulties comes from the accidental degeneracy of the antihydrogen and positronium atoms first excited states. The treatment of this degeneracy has been realised, in a first time, with the close-coupling formalism before being adapted to the Faddeev-Merquriev equations code. In this document, we discuss the cross sections in the GBAR experiment frame and we construe the highlighted resonant phenomena, the Feshbach resonances and the Gailitis-Damburg oscillations.</dcterms:abstract>
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