Εtude des prοpriétés de transpοrt et d'équilibratiοn de la matière nucléaire dans le dοmaine de l'énergie de Fermi

Abstract : The nuclear matter equation of the state is an essential tool in the description of heavy ion collisions, but also in the description of the formation of astrophysical objects or phenomena (neutron star structure, neutron stars fusion). Establishing the nuclear matter equation of state requires a proper definition of the thermodynamic conditions (density, temperature, proton/neutron asymmetry) in which the system evolves. In this work, we address the issue of equilibration reached in heavy ion collisions, in terms of energy and isospin. To do this, we use the experimental database of the INDRA array built by the collaboration over the past 25 years, focusing on central collisions in the Fermi energy domain, between 10 and 100 MeV/nucleon. In this document, we present how, with the help of dedicated simulations, it has been possible to link the stopping power of nuclear matter to the in-medium nucleon-nucleon cross-section. We also provide some answers regarding isospin transport in central collisions using the isobaric ratios A = 3 based on the tritons and helium-3 particles. These different results allow us to highlight the new experimental apparatus develloped by the INDRA and FAZIA collaborations : the FAZIA array. The latter is the result of a ten-year period of research and development, resulting in an array embedded its digital electronic under vacuum, with increased identification performance (measurement of the Z charge and A mass up to Z = 25) compared to the previous generations arrays.
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Maxime Henri. Εtude des prοpriétés de transpοrt et d'équilibratiοn de la matière nucléaire dans le dοmaine de l'énergie de Fermi. Physique Nucléaire Expérimentale [nucl-ex]. Université Caen Normandie, 2018. Français. ⟨tel-01939208⟩

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