SINGLE-PARTICLE EXCITATIONS AND PROPERTIES OF MULTIPLE BAND TERMINATIONS NEAR SPIN 50H IN ER-158

J Simpson, M A Riley, S J Gale, J Sharpeyschafer, 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, M J Joyce, F Liden, J C Lisle, A O MacchiavelliAlastair Smith, J F Smith, J Sweeney, D M Thompson, S Warburton, J N Wilson, T Bengtsson, T Ragnarsson

    Research output: Contribution to journalArticlepeer-review

    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 I(pi) = 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 (epsilon approximately -0.14) is established for a nuclear core plus 12 aligned valence nucleons which is stable against single-particle rearrangements. In the (pi, alpha) = (+,0) states the collective and weakly collective terminating structures are observed to coexist between 30+ and 46+.
    Original languageEnglish
    Pages (from-to)187-194
    JournalPhysics Letters B
    Volume327
    Issue number3-4
    Publication statusPublished - 1994

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