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Theses

Développement d'une interaction nucléaire effective de nouvelle génération

Abstract : The nucleus may seem well known, but its microscopic description still isn't perfect. Describing accurately the nuclei along the nuclear chart remain complicated.Nowadays, the effective interactions are the best choice to achieve such a goal, and can be sorted in two categories: finite-range and zero-range. Skyrme interaction, the main subject of this report, belongs to the latter. Used since the 50s because of its simplicity, it is an expansion of gradients up to the 2th order. However, an international collaboration, UNEDF, showed recently that this interaction was too limited to describe all the nuclear constraints given by experimental datas. The conclusion was the necessity of Skyrme interaction extensions.This thesis is describing the process from the design of the interaction to its use in nuclei and in fitting procedures.First, we review the requirements and the construction of a general nuclear interactions, and the main interactions used in nuclear structure, both finite and zero range.We then show the behaviour of these interactions in a perfect model: the infinite nuclear matter. This is considered a preliminary test for every interaction aiming to describe nuclei, and the performances of our interactions are discussed, along the performances of the other models.The last part of the thesis is the adaptation of our extension for calculations of nuclei. Furthermore, the fitting procedure of our extended Skyrme interaction on both infinite nuclear matter and nuclei quantities is detailed. A resulting parametrisation is presented at the end of the thesis, aiming to describe more accurately the nuclear chart and the additional physic provided by the new terms
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https://tel.archives-ouvertes.fr/tel-01699441
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Submitted on : Friday, February 2, 2018 - 12:55:07 PM
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Pierre Becker. Développement d'une interaction nucléaire effective de nouvelle génération. Physique Nucléaire Théorique [nucl-th]. Université de Lyon, 2017. Français. ⟨NNT : 2017LYSE1153⟩. ⟨tel-01699441⟩

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