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Band termination spectroscopy in 157Er

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Published
  • S.J. Gale
  • J. Simpson
  • M.A. Riley
  • J.F. Sharpey-Schafer
  • E.S. Paul
  • M.A. Bentley
  • A.M. Bruce
  • R. Chapman
  • R.M. Clark
  • S. Clarke
  • J. Copnell
  • D.M. Cullen
  • P. Fallon
  • A. Fitzpatrick
  • P.D. Forsyth
  • S.J. Freeman
  • P.M. Jones
  • F. Liden
  • J.C. Lisle
  • A.O. MacChiavellio
  • A.G. Smith
  • J. Smith
  • J. Sweeney
  • D.M. Thompson
  • S. Warburton
  • J.N. Wilson
  • I. Ragnarsson
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<mark>Journal publication date</mark>1995
<mark>Journal</mark>Journal of Physics G: Nuclear and Particle Physics
Issue number2
Volume21
Number of pages21
Pages (from-to)193-213
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The level scheme of 157Er has been extended from a spin region where the nucleus behaves as a prolate rotor to a region where the spin is produced by the alignment of all or most of the available valence nucleons along the symmetry axis of a weakly deformed oblate shape. The level scheme was established at high spin using up to four-fold gamma -ray coincidences detected in the Eurogam spectrometer following the reaction 114Cd(48Ca,5n)157Er at a bombarding energy of 210 MeV. Particularly favoured states have been established at IK=69/2+, 81/2+, 71/2+, 77/2-, 87-/2 and 89-/2. Specific single-particle configurations are assigned to these special states by comparison with cranked Nilsson-Strutinsky calculations. These states are related to structures observed in the neighbouring nuclei 158Er and 157Ho. These data provide the spectrum of single-particle states for the lowest lying valence orbitals above the 146Gd closed core.