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Collective structure of the N=40 isotones

Abstract : The structure of even-even N=40 isotones is studied from drip line to drip line through the systematic investigation of their quadrupole modes of excitation. Calculations are performed within the Hartree-Fock-Bogoliubov approach using the Gogny D1S effective interaction. Where relevant, these calculations are extended beyond mean field within a generator-coordinate-based method. An overall good agreement with available experimental data is reported, showing that collectivity increases from the neutron to the proton drip line. Whereas 60Ca and 68Ni display a calculated spherical shape in their ground states, all other isotones show a prolate-deformed ground-state band and a quasi-γ band. Coexistence features are predicted in the neutron-deficient N=40 isotones above 74Se.
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Submitted on : Wednesday, January 13, 2010 - 3:55:40 PM
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L. Gaudefroy, A. Obertelli, S. Péru, N. Pillet, S. Hilaire, et al.. Collective structure of the N=40 isotones. Physical Review C, American Physical Society, 2009, 80, 064313 [9 p.]. ⟨10.1103/PhysRevC.80.064313⟩. ⟨in2p3-00446888⟩



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