Stability of oblate shapes in the vicinity of N=Z=34 68Se: Bands in 69Se and 67As

D. G. Jenkins, D. P. Balamuth, M. P. Carpenter, C. J. Lister, S. M. Fischer, R. M. Clark, A. O. Macchiavelli, P. Fallon, C. E. Svensson, N. S. Kelsall, and R. Wadsworth
Phys. Rev. C 64, 064311 – Published 19 November 2001
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Abstract

The γ-ray decay schemes of 69Se and 67As have been considerably extended using the 40Ca(32S,2pn)69Se and 40Ca(32S,αp)67As reactions at 100 MeV and 40Ca(36Ar,α2pn)69Se and 40Ca(36Ar,2αp)67As reactions at 145 MeV, with the aim of studying oblate bands arising from the strong coupling of a valence g9/2 particle (or hole) to the oblate deformed ground state band of 68Se. A new T1/2=12±2nsJπ=9/2+ isomeric bandhead was identified in 67As. A transitional quadrupole moment of Q0=2.7(6)eb was deduced for the band built on the 9/2+ isomer in 69Se, corresponding to a rigid oblate deformation of β2=0.4(1), consistent with theoretical predictions. However, it appears that the relevant oblate configurations in 69Se and 67As are not nearly so favored as they are in 68Se, and are rapidly crossed by prolate configurations that form the high spin yrast lines.

  • Received 22 May 2001

DOI:https://doi.org/10.1103/PhysRevC.64.064311

©2001 American Physical Society

Authors & Affiliations

D. G. Jenkins1,2, D. P. Balamuth1, M. P. Carpenter2, C. J. Lister2, S. M. Fischer3, R. M. Clark4, A. O. Macchiavelli4, P. Fallon4, C. E. Svensson4, N. S. Kelsall5, and R. Wadsworth5

  • 1Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104
  • 2Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
  • 3Department of Physics, DePaul University, Chicago, Illinois 60614
  • 4Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
  • 5Department of Physics, University of York, Heslington, York YO1 5DD, United Kingdom

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Vol. 64, Iss. 6 — December 2001

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