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A la recherche d'une signature de la formation et décroissance du système géant ”Z=184”

Abstract : Defining the limits of stability of nuclear system is one of the most important goals of nuclear physics. The heaviest ensembles of nucleons available on earth are formed in actinides collisions. The collision of two Uranium nuclei, forming the giant system 476184, is studied theoretically within the microscopic model “Time Dependent Hartree Fock” in an energy range below and far above the coulomb barrier and also experimentally, at energies close to the Coulomb barrier up to 20% above (6.09-7.35 AMeV). The VAMOS spectrometer and relevant detection system measuring the mass, charge, energy and diffusion angle of ejectiles are used. We highlight that a large transfer of nucleons between the two reactants (more than 10 nucleons) leads to a complete damping of kinetic energy into the internal degrees of freedom of the giant system and to a strong deformation of it at the scission point. Lifetime of the giant system is estimated to be around 10-21-10-20s. This time would be enough to test the formation of electron-positron pairs produced by the decay of the vacuum, process never proved experimentally until now. The synthesis of heavy neutron-rich nuclei seams to be possible when the excitation energy of reaction products is reduced.
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Submitted on : Monday, September 14, 2009 - 11:05:47 AM
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Cédric Golabek. A la recherche d'une signature de la formation et décroissance du système géant ”Z=184”. Physique Nucléaire Expérimentale [nucl-ex]. Université de Caen, 2009. Français. ⟨tel-00416431⟩

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