Four-quasiparticle alignments in 66Ge


Four-quasiparticle alignments in 66Ge

Stefanova, E. A.; Stefanescu, I.; de Angelis, G.; Curien, D.; Eberth, J.; Farnea, E.; Gadea, A.; Gersch, G.; Jungclaus, A.; Lieb, K. P.; Martinez, T.; Schwengner, R.; Steinhardt, T.; Thelen, O.; Weisshaar, D.; Wyss, R.

The 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. αγ 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=18MeV and I=(23- ). Above angular momentum 10+, we found two sequences, connected by energetically staggered I=1 M1 transitions. The total Routhian surface calculations describe 66Ge at lower spins as a αγ-soft nucleus a having 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 M1 transitions in a deformed four-quasiparticle π(g2 9/2)νg2 9/2 ) structure.

  • Physical Review C 67, 054319 (2003)

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Publ.-Id: 5569