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Structure des fragments de fission de masse A = 100 - 110 : mesures de temps de vie et analyses en champ moyen et au-delà

Abstract : Neutron-rich nuclei of mass A=100-110 are of great interest for the study of nuclear structure far from stability. Previous experimental and theoretical studies suggest a complex evolution of deformation and collectivity in the isotopic chains of Zr, Mo, Ru and Pd.In order to extend information on the evolution of the collectivity towards higher spin states and more neutron-rich nuclei, lifetimes of excited states were measured in nuclei produced through a fusion-fission reaction in inverse kinematic at GANIL. Fission fragments were separated and identified in both A and Z with the high acceptance magnetic spectrometer VAMOS while the EXOGAM germanium detectors array was used for the coincident gamma-ray detection. Lifetimes of about twenty excited states were extracted using the plunger device of Cologne. This is the first RDDS measurement on fission fragments which are identified in A and Z on an event-by-event basis. The study of this mass region is completed by theoretical calculations using self consistent mean field and beyond mean field methods implemented with the Gogny force (D1S). The structure of the ground states and the excited states is described with Hartree-Fock-Bogoliubov calculations with constraints placed on the axial and triaxial deformations. Individual excitations are investigated through blocking calculations and the high spin states are studied through cranking calculations. Finally, an approximated generator coordinate method (GCM+GOA) using the 5DCH hamiltonian is used to describe the low energy collective states and to interpret the experimental evolution of the collectivity.
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Lucie Grente. Structure des fragments de fission de masse A = 100 - 110 : mesures de temps de vie et analyses en champ moyen et au-delà. Physique Nucléaire Expérimentale [nucl-ex]. Université Paris Sud - Paris XI, 2014. Français. ⟨NNT : 2014PA112216⟩. ⟨tel-01136583⟩

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