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First spectroscopy of $^{66}$Se and $^{65}$As: Investigating shape coexistence beyond the N = Z line

Abstract : We report on the first γ spectroscopy of 66Se and 65As from two-neutron removal at intermediate beam energies. The deduced excitation energies for the first-excited states in 66Se and 65As are compared to mean-field-based predictions within a collective Hamiltonian formalism using the Gogny D1S effective interaction and to state-of-the-art shell-model calculations restricted to the pf5/2 g9/2 valence space. The obtained Coulomb-energy differences for the first excited states in 66Se and 65As are discussed within the shell-model formalism to assess the shape-coexistence picture for both nuclei. Our results support a favored oblate ground-state deformation in 66Se and 65As. A shape transition for the ground state of even-odd As isotopes from oblate in 65As to prolate in 67,69,71As is suggested.
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Submitted on : Friday, July 29, 2011 - 2:05:07 PM
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A. Obertelli, T. Baugher, Dominique Bazin, S. Boissinot, J.-P. Delaroche, et al.. First spectroscopy of $^{66}$Se and $^{65}$As: Investigating shape coexistence beyond the N = Z line. Physics Letters B, Elsevier, 2011, 701, pp.417-421. ⟨10.1016/j.physletb.2011.06.032⟩. ⟨in2p3-00605721⟩



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