Shape coexistence effects and quasiparticle alignment in Sr81

E. F. Moore, P. D. Cottle, C. J. Gross, D. M. Headly, U. J. Hüttmeier, S. L. Tabor, and W. Nazarewicz
Phys. Rev. C 38, 696 – Published 1 August 1988
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Abstract

High spin states in Sr81 were investigated in the reactions Fe56(28Si,2pn) at 103.6 MeV and Mn55(29Si,p2n) at 95.2 MeV using the techniques of in-beam γ-ray spectroscopy. Measurements were made of γ-γ coincidences and γ-ray directional correlations from oriented nuclei. The lifetimes of 12 states and lifetime limits of 10 others were determined with the Doppler shift attenuation method. The data have been analyzed in terms of the Woods-Saxon cranking model. The first crossing observed in the yrast band is attributed to the alignment of a pair of g9/2 protons. The irregularities observed in the J(2) moment of inertia in the Kπ=(5/2 and 1/2(+) bands are interpreted as evidence for the alignment of a g9/2 proton pair as well. The coexistence of prolate and oblate configurations at low spin is discussed in terms of the polarization of the soft even-even core by the odd neutron.

  • Received 25 April 1988

DOI:https://doi.org/10.1103/PhysRevC.38.696

©1988 American Physical Society

Authors & Affiliations

E. F. Moore, P. D. Cottle, C. J. Gross, D. M. Headly, U. J. Hüttmeier, and S. L. Tabor

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

W. Nazarewicz

  • Supercomputer Computations Research Institute, Florida State University, Tallahassee, Florida 32306
  • Institute of Physics, Warsaw Institute of Technology, PL-00662 Warsaw, Poland

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Vol. 38, Iss. 2 — August 1988

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