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Modèles de réactions directes et de pré-équilibre quantique pour la diffusion de nucléons sur des noyaux sphériques

Abstract : When a nucleon collides with a target nucleus, several reactions may occur : elastic and inelastic scatterings, charge exchange ... In order to describe these reactions, different models are involved : the direct reactions, pre-equilibrium and compound nucleus models. Our goal is to study, within a quantum framework and without any adjustable parameter, the direct and pre-equilibrium reactions for nucleons scatterings off double closed-shell nuclei. We first consider direct reactions : we are studying nucleon scattering with the Melbourne G-matrix, which represents the interaction between the projectile and one target nucleon, and with RPA wave functions which describe all target states. This is a fully microscopic approach since no adjustable parameters are involved. A second part is dedicated to the study of nucleon inelastic scattering for large energy transfer which necessarily involves the pre-equilibrium mechanism. Several models have been developed in the past to deal with pre-equilibrium. They start from the Born expansion of the transition amplitude which is associated to the inelastic process and they use several approximations which have not yet been tested. We have achieved some comparisons between second order cross sections which have been calculated with and without these approximations. Our results allow us to criticize some of these approximations and give several directions to improve the quantum pre-equilibrium models.
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Marc Dupuis. Modèles de réactions directes et de pré-équilibre quantique pour la diffusion de nucléons sur des noyaux sphériques. Physique Nucléaire Théorique [nucl-th]. Université Sciences et Technologies - Bordeaux I, 2006. Français. ⟨tel-00412169⟩

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