Structure of neutron-deficient nuclei by gamma spectroscopy. Resume of Ph.D thesis

This is an extended abstract of the Ph. D. thesis devoted to the experimental study by in-beam gamma spectroscopy of the neutron-deficient nuclei 111 Sb and 146 Nd. The experimental investigation of these nuclei implied the following measurements: 1. in-beam activations; 2. cross reactions; 3. excitation functions; 4. charged-particle - gamma; 5. neutron - gamma coincidences; 6. γ-γ coincidences; 7. lifetime determinations; 8. gated-angular distributions 9. angular correlations. Original contributions concerning lifetime determination through the time centroid shift method, interpretation of double angular correlations of gamma rays emitted from oriented sources and a quasi-complete program package for processing and interpretation of in-beam gamma spectroscopy data are given. The nuclear data and shape coexistence in the 111 Sb nucleus are reported for the first time. The nuclear level scheme of 146 Nd was greatly extended, reaching levels as high as E ∼ 7.5 MeV, and Jπ = (22+). Also in the case of this nucleus the coexistence of mirror symmetric and asymmetric states was evidenced. The data were interpreted both in the frame of deformed mean field model and IBA model. (M.I.C.). 5 Figs., 3 Tabs., 35 Refs