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Spin ∼ 60 ℏ in 156Dy : Competition between collective and terminating structures at very high-spin

Kondev, F. G. ; Riley, M. A. ; Janssens, R. V.F. ; Simpson, J. ; Afanasjev, A. V. ; Ragnarsson, I. LU ; Ahmad, I. ; Blumenthal, D. J. ; Brown, T. B. LU and Carpenter, M. P. , et al. (1998) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 437(1-2). p.35-43
Abstract

The highest-spin discrete states (I ∼ 60 ℏ and Ex ∼ 30 MeV) in normal deformed nuclei have been observed in the rare-earth isotope 156Dy using the 124Sn(36S,4n) reaction in conjunction with the GAMMASPHERE spectrometer. The positive parity yrast sequence appears to evolve smoothly from a prolate (collective) towards an oblate (non-collective) shape, in contrast to the sudden shape change observed in the isotone 158Er. Terminating states are identified in the negative parity sequences at Iπ = 52- and 53- and specific multi-particle-hole configurations are assigned by comparison with cranked Nilsson-Strutinsky calculations. An order of magnitude... (More)

The highest-spin discrete states (I ∼ 60 ℏ and Ex ∼ 30 MeV) in normal deformed nuclei have been observed in the rare-earth isotope 156Dy using the 124Sn(36S,4n) reaction in conjunction with the GAMMASPHERE spectrometer. The positive parity yrast sequence appears to evolve smoothly from a prolate (collective) towards an oblate (non-collective) shape, in contrast to the sudden shape change observed in the isotone 158Er. Terminating states are identified in the negative parity sequences at Iπ = 52- and 53- and specific multi-particle-hole configurations are assigned by comparison with cranked Nilsson-Strutinsky calculations. An order of magnitude increase in the interaction strength between close lying high-spin weakly collective structures is determined compared with that found in the lower-spin strongly collective domain. These results give valuable insight into the interplay between collective and terminating structures, and their competition for yrast status in the 40 - 60 ℏ spin range.

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publishing date
type
Contribution to journal
publication status
published
subject
keywords
Band termination, Bands interaction, High-spin collective structures, Nilsson-Strutinsky cranking calculations
in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
437
issue
1-2
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:0347091071
ISSN
0370-2693
DOI
10.1016/S0370-2693(98)00938-1
language
English
LU publication?
yes
id
7685dad0-2786-4b54-b283-be7108c3927d
date added to LUP
2026-01-15 10:25:31
date last changed
2026-02-06 14:55:59
@article{7685dad0-2786-4b54-b283-be7108c3927d,
  abstract     = {{<p>The highest-spin discrete states (I ∼ 60 ℏ and E<sub>x</sub> ∼ 30 MeV) in normal deformed nuclei have been observed in the rare-earth isotope <sup>156</sup>Dy using the <sup>124</sup>Sn(<sup>36</sup>S,4n) reaction in conjunction with the GAMMASPHERE spectrometer. The positive parity yrast sequence appears to evolve smoothly from a prolate (collective) towards an oblate (non-collective) shape, in contrast to the sudden shape change observed in the isotone <sup>158</sup>Er. Terminating states are identified in the negative parity sequences at I<sup>π</sup> = 52<sup>-</sup> and 53<sup>-</sup> and specific multi-particle-hole configurations are assigned by comparison with cranked Nilsson-Strutinsky calculations. An order of magnitude increase in the interaction strength between close lying high-spin weakly collective structures is determined compared with that found in the lower-spin strongly collective domain. These results give valuable insight into the interplay between collective and terminating structures, and their competition for yrast status in the 40 - 60 ℏ spin range.</p>}},
  author       = {{Kondev, F. G. and Riley, M. A. and Janssens, R. V.F. and Simpson, J. and Afanasjev, A. V. and Ragnarsson, I. and Ahmad, I. and Blumenthal, D. J. and Brown, T. B. and Carpenter, M. P. and Fallon, P. and Fischer, S. M. and Hackman, G. and Hartley, D. J. and Kalfas, C. A. and Khoo, T. L. and Lauritsen, T. and Ma, W. C. and Nisius, D. and Sharpey-Schafer, J. F. and Varmette, P. G.}},
  issn         = {{0370-2693}},
  keywords     = {{Band termination; Bands interaction; High-spin collective structures; Nilsson-Strutinsky cranking calculations}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{1-2}},
  pages        = {{35--43}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{Spin ∼ 60 ℏ in <sup>156</sup>Dy : Competition between collective and terminating structures at very high-spin}},
  url          = {{http://dx.doi.org/10.1016/S0370-2693(98)00938-1}},
  doi          = {{10.1016/S0370-2693(98)00938-1}},
  volume       = {{437}},
  year         = {{1998}},
}