Description microscopique de nucléons corrélés : propriétés collectives dans les noyaux stables et exotiques

par Olivier Vasseur

Projet de thèse en Structure et réactions nucléaires

Sous la direction de Marcella Grasso.

Thèses en préparation à Paris Saclay , dans le cadre de École doctorale Particules, Hadrons, Énergie, Noyau, Instrumentation, Imagerie, Cosmos et Simulation (Orsay, Essonne) , en partenariat avec Institut de physique nucléaire d'orsay (laboratoire) et de Université Paris-Sud (établissement de préparation de la thèse) depuis le 01-10-2016 .


  • Résumé

    Nuclei are complex many-body systems. Several types of correlations play an important role in defining their properties, such as, for instance, their collective behavior and their excitation modes. The drawbacks of traditional mean-field models in nuclear physics are discussed in our community and attempts to go beyond this standard framework are proposed by several groups. In Orsay, we propose a study beyond the mean field based on the so-called second random-phase approximation (SRPA) (multiparticle configurations are included), to analyze in an accurate and predictive way collective properties of stable and unstable nuclei in their excitation spectra. The model that will be developed in this thesis will properly include correlations in the ground state. The development of this thesis will lead to a formal and a numerical work. For the formal part, the student will work on an extension of the equations associated to the SRPA model to include correlations in the ground state. For the numerical part, the student will work on the associated codes. Applications will be done in the last part of the thesis. For this, discussions and exchanges with experimentalists will be carried out to analyze some experimental data for low-lying (pygmy) excitations and giant resonances. This work is developed in the framework of an international collaboration between IPN Orsay (Marcella Grasso) and the theory group in Catania, Italy (Danilo Gambacurta). Marcella Grasso and Danilo Gambacurta will supervise together the thesis.

  • Titre traduit

    A microscopic treatment of correlated nucleons: collective properties in stable and exotic nuclei


  • Résumé

    Nuclei are complex many-body systems. Several types of correlations play an important role in defining their properties, such as, for instance, their collective behavior and their excitation modes. The drawbacks of traditional mean-field models in nuclear physics are discussed in our community and attempts to go beyond this standard framework are proposed by several groups. In Orsay, we propose a study beyond the mean field based on the so-called second random-phase approximation (SRPA) (multiparticle configurations are included), to analyze in an accurate and predictive way collective properties of stable and unstable nuclei in their excitation spectra. The model that will be developed in this thesis will properly include correlations in the ground state. The development of this thesis will lead to a formal and a numerical work. For the formal part, the student will work on an extension of the equations associated to the SRPA model to include correlations in the ground state. For the numerical part, the student will work on the associated codes. Applications will be done in the last part of the thesis. For this, discussions and exchanges with experimentalists will be carried out to analyze some experimental data for low-lying (pygmy) excitations and giant resonances. This work is developed in the framework of an international collaboration between IPN Orsay (Marcella Grasso) and the theory group in Catania, Italy (Danilo Gambacurta). Marcella Grasso and Danilo Gambacurta will supervise together the thesis.