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Single particle excitations and properties of multiple band terminations near spin 50h{stroke} in 158Er

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  • J. Simpson
  • M.A. Riley
  • S.J. Gale
  • J.F. Sharpey-Schafer
  • 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. Macchiavelli
  • A.G. Smith
  • J.F. Smith
  • J. Sweeney
  • D.M. Thompson
  • S. Warburton
  • J.N. Wilson
  • T. Bengtsson
  • I. Ragnarsson
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<mark>Journal publication date</mark>1994
<mark>Journal</mark>Physics Letters B
Issue number3-4
Volume327
Number of pages8
Pages (from-to)187-194
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The competition between collective rotation and single-particle behaviour at high spin in 158Er has been investigated with the Eurogam spectrometer. Band terminating states have been observed in three structures at Iπ = 46+, 48− and 49− and specific single-particle configurations are assigned by comparison with cranked Nilsson-Strutinsky calculations. These special states are found to be related by very simple single particle excitations. These data indicate that an oblate mean field (ϵ ∼ −0.14) is established for a nuclear core plus 12 aligned valence nucleons which is stable against single-particle rearrangements. In the (π, α) = (+, 0) states the collective and weakly collective terminating structures are observed to coexist between 30+ and 46+.