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Single particle excitations and properties of multiple band terminations near spin 50ħ in 158Er

Simpson, J. ; Riley, M. A. ; Gale, S. J. ; Sharpey-Schafer, J. F. ; Bentley, M. A. ; Bruce, A. M. ; Chapman, R. ; Clark, R. M. ; Clarke, S. and Copnell, J. , et al. (1994) In Physics Letters B 327(3-4). p.187-194
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{lunate} ∼ -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... (More)

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{lunate} ∼ -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+.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physics Letters B
volume
327
issue
3-4
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:0001001616
ISSN
0370-2693
DOI
10.1016/0370-2693(94)90716-1
language
English
LU publication?
yes
id
ee32f336-57cf-42c7-8ae9-cbefadec9ebb
date added to LUP
2026-01-15 10:50:37
date last changed
2026-01-27 14:49:41
@article{ee32f336-57cf-42c7-8ae9-cbefadec9ebb,
  abstract     = {{<p>The competition between collective rotation and single-particle behaviour at high spin in <sup>158</sup>Er has been investigated with the Eurogam spectrometer. Band terminating states have been observed in three structures at I<sup>π</sup> = 46<sup>+</sup>, 48<sup>-</sup> and 49<sup>-</sup> 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{lunate} ∼ -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<sup>+</sup> and 46<sup>+</sup>.</p>}},
  author       = {{Simpson, J. and Riley, M. A. and Gale, S. J. and Sharpey-Schafer, J. F. and Bentley, M. A. and Bruce, A. M. and Chapman, R. and Clark, R. M. and Clarke, S. and Copnell, J. and Cullen, D. M. and Fallon, P. and Fitzpatrick, A. and Forsyth, P. D. and Freeman, S. J. and Jones, P. M. and Joyce, M. J. and Liden, F. and Lisle, J. C. and Macchiavelli, A. O. and Smith, A. G. and Smith, J. F. and Sweeney, J. and Thompson, D. M. and Warburton, S. and Wilson, J. N. and Bengtsson, T. and Ragnarsson, I.}},
  issn         = {{0370-2693}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{3-4}},
  pages        = {{187--194}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters B}},
  title        = {{Single particle excitations and properties of multiple band terminations near spin 50ħ in 158Er}},
  url          = {{http://dx.doi.org/10.1016/0370-2693(94)90716-1}},
  doi          = {{10.1016/0370-2693(94)90716-1}},
  volume       = {{327}},
  year         = {{1994}},
}