Influence des corrélations entre les nucléons sur les réactions de cassure nucléaire : aspects théorique et expérimentaux

Abstract : Nuclear break-up has been studied both from an experimental and a theoretical point of view and has shown to be powerful tool to probe nucleon correlations in nuclei. A theory beyond mean-field , called TDDMP , taking into account two-body correlations has been developed. The dynamical evolution of a correlated nuclei can be described and especially nuclear break-up. This study shows that the distributions of relative angle between the two neutrons strongly differ when varying initial correlations : two nucleons close together in the nuclei will lead to small relative angle after emission whereas two nucleons far from each other gives large relative angles. From an experimental point of view, correlations between the two neutrons in the halo of the borromean nucleus 6He have been investigated. Its ground state is predicted to have two dominant configurations : the di-neutron configuration where the two neutrons are very close to each other and the cigar configuration, where the two neutrons are on opposite side with respect to the core. Nuclear break-up of 6He on a lead target has been studied at GANIL with a SPIRAL beam. The alpha particles coming out of the break-up where detected by a stripped Silicon detector coupled to a Silicon-Lithium detector and the neutrons by EDEN and the Neutron Wall, in order to get a large angular coverage. Angular correlation functions extracted from data show both strong correlation at small relative angles and at large relative angle corresponding respectively to the contribution of the di-neutron configuration and of the cigar like configuration. So 6He ground state seems to be a superposition of these two configurations.
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Marlene Assié. Influence des corrélations entre les nucléons sur les réactions de cassure nucléaire : aspects théorique et expérimentaux. Physique Nucléaire Théorique [nucl-th]. Université Paris Sud - Paris XI, 2008. Français. ⟨tel-00359266⟩

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