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Discrete levels in 154Dy above spin 30ħ : Evidence for terminating band structures

Cranmer-Gordon, H. W. ; Forsyth, P. D. ; Elenkov, D. V. ; Howe, D. ; Sharpey-Schafer, J. F. ; Riley, M. A. ; Sletten, G. ; Simpson, J. ; Ragnarsson, I. LU and Xing, Z. , et al. (1987) In Nuclear Physics, Section A 465(3). p.506-528
Abstract

High-spin states in 154Dy have been studied using the TESSA2 γ-rays spectrometer following the 110Pd(48Ca,4n)154Dy reaction at a beam energy of 210 MeV. States up to 44+ and 37- have been observed. Below spin 30 the data display regular rotational behaviour which can be interpreted in terms of the cranked shell model. Above spin 30, sequences of levels connected by stretched E2 transitions, which show large gains in energy when compared to a rotating liquid drop reference, are lowest in energy for both parities. Particularly low energy levels are observed for spin Iπ = 36+ and 42+ and in addition dipole transitions are found connecting... (More)

High-spin states in 154Dy have been studied using the TESSA2 γ-rays spectrometer following the 110Pd(48Ca,4n)154Dy reaction at a beam energy of 210 MeV. States up to 44+ and 37- have been observed. Below spin 30 the data display regular rotational behaviour which can be interpreted in terms of the cranked shell model. Above spin 30, sequences of levels connected by stretched E2 transitions, which show large gains in energy when compared to a rotating liquid drop reference, are lowest in energy for both parities. Particularly low energy levels are observed for spin Iπ = 36+ and 42+ and in addition dipole transitions are found connecting negative-parity states around spin I = 35. The experimental data for I ≳ 30 are compared with calculations, based on the Nilsson-Strutinsky cranking formalism, in which it is possible to trace fixed configurations through a sequence of spins. For the high-spin positive-parity sequence, the similarity with the 156Er spectrum is discussed.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Nuclear reactions
in
Nuclear Physics, Section A
volume
465
issue
3
pages
23 pages
publisher
Elsevier
external identifiers
  • scopus:0001593590
ISSN
0375-9474
DOI
10.1016/0375-9474(87)90362-9
language
English
LU publication?
yes
id
f8b942e6-74dc-4a64-8854-3d33bab8d41e
date added to LUP
2026-01-15 11:08:38
date last changed
2026-01-23 13:42:36
@article{f8b942e6-74dc-4a64-8854-3d33bab8d41e,
  abstract     = {{<p>High-spin states in <sup>154</sup>Dy have been studied using the TESSA2 γ-rays spectrometer following the <sup>110</sup>Pd(<sup>48</sup>Ca,4n)<sup>154</sup>Dy reaction at a beam energy of 210 MeV. States up to 44<sup>+</sup> and 37<sup>-</sup> have been observed. Below spin 30 the data display regular rotational behaviour which can be interpreted in terms of the cranked shell model. Above spin 30, sequences of levels connected by stretched E2 transitions, which show large gains in energy when compared to a rotating liquid drop reference, are lowest in energy for both parities. Particularly low energy levels are observed for spin I<sup>π</sup> = 36<sup>+</sup> and 42<sup>+</sup> and in addition dipole transitions are found connecting negative-parity states around spin I = 35. The experimental data for I ≳ 30 are compared with calculations, based on the Nilsson-Strutinsky cranking formalism, in which it is possible to trace fixed configurations through a sequence of spins. For the high-spin positive-parity sequence, the similarity with the <sup>156</sup>Er spectrum is discussed.</p>}},
  author       = {{Cranmer-Gordon, H. W. and Forsyth, P. D. and Elenkov, D. V. and Howe, D. and Sharpey-Schafer, J. F. and Riley, M. A. and Sletten, G. and Simpson, J. and Ragnarsson, I. and Xing, Z. and Bengtsson, T.}},
  issn         = {{0375-9474}},
  keywords     = {{Nuclear reactions}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{3}},
  pages        = {{506--528}},
  publisher    = {{Elsevier}},
  series       = {{Nuclear Physics, Section A}},
  title        = {{Discrete levels in 154Dy above spin 30ħ : Evidence for terminating band structures}},
  url          = {{http://dx.doi.org/10.1016/0375-9474(87)90362-9}},
  doi          = {{10.1016/0375-9474(87)90362-9}},
  volume       = {{465}},
  year         = {{1987}},
}