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Shape Changes, Band Crossings and Band Terminations in the Very High Spin Region of A = 150-160 Nuclei

Bengtsson, Tord and Ragnarsson, Ingemar LU (1983) In Physica Scripta 1983(T5). p.165-170
Abstract

The very high spin behaviour of nuclei with ∼ 10 particles outside the 146Gd core are studied. Our method of calculation, which is based on the cranked Nilsson-Strutinsky formalism, makes possible to follow individual configurations as functions of spin. We concentrate on 158Er and 154Dy which nuclei become oblate with rotation around the symmetry axes for I = 40-50. It is found that most such oblate states can be described as band terminations, i.e., they correspond to the maximum spin which can be formed if the distribution of nucleons over the j-shells is kept fixed. A strong argument which supports this conclusion is the M1-bump which has recently been observed for 158Yb. Such an M1-bump... (More)

The very high spin behaviour of nuclei with ∼ 10 particles outside the 146Gd core are studied. Our method of calculation, which is based on the cranked Nilsson-Strutinsky formalism, makes possible to follow individual configurations as functions of spin. We concentrate on 158Er and 154Dy which nuclei become oblate with rotation around the symmetry axes for I = 40-50. It is found that most such oblate states can be described as band terminations, i.e., they correspond to the maximum spin which can be formed if the distribution of nucleons over the j-shells is kept fixed. A strong argument which supports this conclusion is the M1-bump which has recently been observed for 158Yb. Such an M1-bump seems to be a natural consequence of the terminating bands. A further consequence is that these bands appear to prohibit the formation of yrast isomers for spins much larger than I = 40.

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type
Contribution to journal
publication status
published
subject
in
Physica Scripta
volume
1983
issue
T5
pages
6 pages
publisher
IOP Publishing
external identifiers
  • scopus:84956269041
ISSN
0031-8949
DOI
10.1088/0031-8949/1983/T5/031
language
English
LU publication?
yes
id
d4339128-41f9-44e9-aa4c-151ca6023458
date added to LUP
2026-01-15 10:02:51
date last changed
2026-01-20 11:31:18
@article{d4339128-41f9-44e9-aa4c-151ca6023458,
  abstract     = {{<p>The very high spin behaviour of nuclei with ∼ 10 particles outside the <sup>146</sup>Gd core are studied. Our method of calculation, which is based on the cranked Nilsson-Strutinsky formalism, makes possible to follow individual configurations as functions of spin. We concentrate on <sup>158</sup>Er and <sup>154</sup>Dy which nuclei become oblate with rotation around the symmetry axes for I = 40-50. It is found that most such oblate states can be described as band terminations, i.e., they correspond to the maximum spin which can be formed if the distribution of nucleons over the j-shells is kept fixed. A strong argument which supports this conclusion is the M1-bump which has recently been observed for <sup>158</sup>Yb. Such an M1-bump seems to be a natural consequence of the terminating bands. A further consequence is that these bands appear to prohibit the formation of yrast isomers for spins much larger than I = 40.</p>}},
  author       = {{Bengtsson, Tord and Ragnarsson, Ingemar}},
  issn         = {{0031-8949}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{T5}},
  pages        = {{165--170}},
  publisher    = {{IOP Publishing}},
  series       = {{Physica Scripta}},
  title        = {{Shape Changes, Band Crossings and Band Terminations in the Very High Spin Region of A = 150-160 Nuclei}},
  url          = {{http://dx.doi.org/10.1088/0031-8949/1983/T5/031}},
  doi          = {{10.1088/0031-8949/1983/T5/031}},
  volume       = {{1983}},
  year         = {{1983}},
}