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Theses

Etude de l'écoulement de matière nucléaire avec le multidétecteur INDRA

Abstract : The work carried out in this thesis relates to the study of the products which are not emitted by the statistical desexcitation of the projectile and target. The experiment on which this work is based on was performed at GANIL with the detector INDRA on two systems: 36Ar + 58Ni and 129Xe + 119Sn. A whole characterisation (mass, composition, multiplicities and energetic properties) of mid-rapidity emission has been done for the system 36Ar + 58Ni between 52 and 95 A.MeV. The amount of matter associated to this emission seems to be independent of the incident energy and directly linked with the centrality of the collision. The available energy per nucléon for the production of midrapidity products seems to be insensitive to the impact parameter. A systematic study of the nuclear matter in-plane flow has also been carried out. It has been established that the usual methods for reaction plane determination don't allow one to measure accurately the value of flow parameter at intermediate energies. Nevertheless the inversion energy of the system 36Ar + 58Ni can be calculated for central collisions. This energy is independent on the nature of the products. Its value and the features of the mid-rapidity emission should allow one to extract in-medium nucleon-nucleon cross section by comparison with theoretical results.
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http://hal.in2p3.fr/in2p3-00018136
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  • HAL Id : in2p3-00018136, version 1

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T. Lefort. Etude de l'écoulement de matière nucléaire avec le multidétecteur INDRA. Physique Nucléaire Expérimentale [nucl-ex]. Université de Caen, 1997. Français. ⟨in2p3-00018136⟩

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