Rotational band structure in Se75

T. D. Johnson, T. Glasmacher, J. W. Holcomb, P. C. Womble, S. L. Tabor, and W. Nazarewicz
Phys. Rev. C 46, 516 – Published 1 August 1992
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Abstract

The high-spin states of Se75 have been investigated using the Co59 (19F, 2pn) reaction at 55 MeV. The positive-parity band has been extended to Iπ=29/2+ and the unfavored signature has been identified. The negative-parity band has been extended to Iπ=19/2 and band crossings were observed for the first time in both bands. Eleven new lifetimes were measured using the Doppler-shift attenuation method which allowed for extraction of transition strengths and transition quadrupole moments. The B(M1) strengths exhibit a staggering dependent on the signature splitting. Calculations based on the Woods-Saxon-Bogolyubov cranking model explain the signature-dependent alignment process in the g9/2 bands and predict signature inversion in all bands at high rotational frequencies. It is argued that the data are consistent with the transition from triaxial shapes with γ∼-30°, characteristic of one-quasiparticle configurations, to triaxial shapes with γ∼30°, characteristic of a three-quasiparticle configuration containing one aligned pair of g9/2 protons.

  • Received 31 January 1992

DOI:https://doi.org/10.1103/PhysRevC.46.516

©1992 American Physical Society

Authors & Affiliations

T. D. Johnson, T. Glasmacher, J. W. Holcomb, P. C. Womble, and S. L. Tabor

  • Department of Physics, Florida State University, Tallahassee, Florida 32306

W. Nazarewicz

  • Department of Physics, Florida State University, Tallahassee, Florida 32306
  • Joint Institute for Heavy Ion Research, Holifield Heavy Ion Research Facility, Oak Ridge, Tennessee 37831

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Vol. 46, Iss. 2 — August 1992

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