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Four-quasiparticle alignments in 66Ge

AuthorsStefanova, E.A.; Stefanescu, I.; De Angelis, G.; Curien, D.; Eberth, J.; Farnea, E.; Gadea, Andrés ; Gersch, G.; Jungclaus, Andrea ; Lieb, K.P.; Martinez, T.; Schwengner, R.; Steinhardt, T.; Thelen, O.; Weisshaar, D.; Wyss, R.
Issue Date30-May-2003
PublisherAmerican Physical Society
CitationPhysical Review C - Nuclear Physics 67: 543191-5431913 (2003)
AbstractThe neutron-deficient nucleus 66Ge was populated at high spin in two experiments using the reaction 40Ca(32S, α2p) at beam energies of 105 and 95 MeV. In the first experiment, a self-supporting 40Ca target was used, while a gold-backed target of similar thickness was used in the second experiment, γ rays were detected with the EUROBALL array, combined with the charged-particle detector array EUCLIDES and the Neutron Wall. The level scheme of 66Ge was extended up to E ≈ 18 MeV and Iπ = (23-). Above angular momentum 10+, we found two sequences, connected by energetically staggered ΔI = 1 M 1 transitions. The total Routhian surface calculations describe 66Ge at lower spins as a γ-soft nucleus having a moderate deformation of β2 ≈ 0.23, while a triaxial deformation is predicted for the band structures above Iπ = 10+. To our knowledge, this is the first observation of staggered Ml transitions in a deformed four-quasiparticle π(g9/2 2) ν(g9/2 2) structure. ©2003 American Physical Society
Description13 págs.; 7 figs.; 1 tab. ; PACS number(s): 23.20.Lv, 21.10.Re, 25.70.Hi, 27.50.1e
Publisher version (URL)https://doi.org/10.1103/PhysRevC.67.054319
Identifiersdoi: 10.1103/PhysRevC.67.054319
issn: 0556-2813
Appears in Collections:(CFMAC-IEM) Artículos
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