Four-quasiparticle alignments in Ge-66

QC 20100525
The neutron-deficient nucleus Ge-66 was populated at high spin in two experiments using the reaction Ca-40(S-32,alpha2p) at beam energies of 105 and 95 MeV. In the first experiment, a self-supporting Ca-40 target was used, while a gold-backed target of similar thickness was used in the second experiment. gamma rays were detected with the EUROBALL array, combined with the charged-particle detector array EUCLIDES and the Neutron Wall. The level scheme of Ge-66 was extended up to Eapproximate to18 MeV and I-pi=(23(-)). Above angular momentum 10(+), we found two sequences, connected by energetically staggered DeltaI=1 M1 transitions. The total Routhian surface calculations describe Ge-66 at lower spins as a gamma-soft nucleus having a moderate deformation of beta(2)approximate to0.23, while a triaxial deformation is predicted for the band structures above I-pi=10(+). To our knowledge, this is the first observation of staggered M1 transitions in a deformed four-quasiparticle pi(g(9/2)(2))nu(g(9/2)(2)) structure.

Av författaren/redakt...: Stefanova, E. A.; Stefanescu, I.; de Angelis, G.; Curien, D.; Eberth, J.; Farnea, E.; visa fler...; Gadea, A.; Gersch, G.; Jungclaus, A.; Lieb, K. P.; Martinez, T.; Schwengner, R.; Steinhardt, T.; Thelen, O.; Weisshaar, D.; Wyss, Ramon; visa färre...

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