Etude par excitation coulombienne de la fermeture de couche N=40

Abstract : Two Coulomb excitation experiments on neutron rich exotic nuclei have been performed at GANIL. They allowed the measurement of the reduced transition probability B(E2) (from ground state to first excited state) of some nuclei around N=40. This number, 40, is a halfmagic number in the shell model. For nuclei with an important neutron excess, it is predicted that the shell closure is stronger at N=40. The B(E2) is a good tool for testing this growing. We have measured, by using the LISE3 spectrometer and a gamma multidetector, B(E2) of 68JVi, 66Ni and 72Zn, unknown till now. We have used for the first time segmented germanium "clovers" detector, for photon detection (v/c ~ 0.3). Results confirm the strong shell effect for 68Ni. Indeed 68 Ni was shown to be the Nickel isotope with the lowest value of B(E2), and hence the most rigid isotope. Nevertheless it seems that the shell effect at N = 40 decreases rapidly, for other isotopes very close to 68Ni (Z = 28 and N = 40).
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S. Leenhardt. Etude par excitation coulombienne de la fermeture de couche N=40. Physique Nucléaire Expérimentale [nucl-ex]. Université Paris Sud - Paris XI, 2000. Français. ⟨in2p3-00009949⟩

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