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Collectivité des noyaux de Zinc riches en neutrons par mesure de temps de vie avec le démonstrateur AGATA. Développement d'une cible d'hydrogène et physique aux énergies relativistes

Abstract : The study of exotic nuclei spectroscopy and structure allowed, in the last years, numerous discoveries in respect to what is known from stable nuclei: nuclei can be deformed and the magic numbers are not persistent when moving toward the drip lines. Around 68Ni, which presents signs of shell closures at N=40 (high excitation energy of the 2+1 and low B(E2)), exotic nuclei, like Cr, Fr, Zn and Ge, present deformation and recent experiments point to rapid development of collectivity. The experiment done at LNL (Laboratori Nazionali di Legnaro) on 70,72,74Zn isotopes concluded a surprisingly long life time for the 4+ states of 74Zn, leading to a ratio of B(E2; 4+ -> 2 +) to B(E2; 2+ -> 0+) very low, not explicated by calculations beyond ,mean field or shell models. This experiment was one of the first of the AGATA demonstrator. Two types of direct reactions are used to extract spectroscopic factors, quantity linked to the shell occupation number. The experimental values are not consistent between the cases for the removal of one deeply bound nucleon in the nuclei. This difference between the two experimental measures could come from an incorrect modelization of the reaction mechanism or nucleon removal. Calculations based on intra-nuclear cascade followed by an evaporation phase show shortcomings in the current reaction models.
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Corinne Louchart-Henning. Collectivité des noyaux de Zinc riches en neutrons par mesure de temps de vie avec le démonstrateur AGATA. Développement d'une cible d'hydrogène et physique aux énergies relativistes. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2012. Français. ⟨NNT : 2012PA112160⟩. ⟨tel-00819675⟩

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