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Four-quasiparticle alignments in Ge-66
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2003 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 67, no 5Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2003. Vol. 67, no 5
Keyword [en]
neutron-deficient nuclei, multiple band structures, even ge-isotopes, high-spin states, signature inversion, shape coexistence, zr-86, odd, model, collectivity
URN: urn:nbn:se:kth:diva-22568DOI: 10.1103/PhysRevC.67.054319ISI: 000183382500036OAI: diva2:341266
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Wyss, Ramon
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