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Magnetic dipole bands in 190Hg : First evidence of excitations across the Z = 82 sub-shell in Hg nuclei

Wilson, A. N. ; Timár, J. ; Ahmad, I. ; Astier, A. ; Azaiez, F. ; Bergström, M. H. ; Blumenthal, D. J. ; Crowell, B. ; Carpenter, M. P. and Ducroux, L. , et al. (2001) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 505(1-4). p.6-14
Abstract

An experiment aimed at studying high-spin states in 190Hg was performed with the Eurogam II array. The data have revealed the presence of cascades of magnetic dipole transitions with some unexpected properties. Unlike the MI bands previously observed in the heavier Hg isotopes, these structures have extremely large B(M1)/B(E2) ratios, The observation of a third dipole band with much lower B(M1)/B(E2) values in the same spin/excitation energy regime suggests that the bands may represent configurations occurring in different minima in the potential energy surface. Configuration-dependent Cranked Nilsson-Strutinsky calculations predict the presence of a minimum in the nuclear potential energy surface at a deformation of ε ≅ 0.2,... (More)

An experiment aimed at studying high-spin states in 190Hg was performed with the Eurogam II array. The data have revealed the presence of cascades of magnetic dipole transitions with some unexpected properties. Unlike the MI bands previously observed in the heavier Hg isotopes, these structures have extremely large B(M1)/B(E2) ratios, The observation of a third dipole band with much lower B(M1)/B(E2) values in the same spin/excitation energy regime suggests that the bands may represent configurations occurring in different minima in the potential energy surface. Configuration-dependent Cranked Nilsson-Strutinsky calculations predict the presence of a minimum in the nuclear potential energy surface at a deformation of ε ≅ 0.2, γ ≅ -90°, occurring when a proton is excited across the Z = 82 shell-gap into an h9/2 orbital. It is suggested that the bands exhibiting anomalously large B(M1)/B(E2) ratios may be associated with this minimum.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
505
issue
1-4
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:0035953678
ISSN
0370-2693
DOI
10.1016/S0370-2693(01)00332-X
language
English
LU publication?
yes
id
5186effa-8ee9-461b-b12f-ec932ac6b83a
date added to LUP
2024-01-19 11:43:13
date last changed
2024-01-22 16:06:37
@article{5186effa-8ee9-461b-b12f-ec932ac6b83a,
  abstract     = {{<p>An experiment aimed at studying high-spin states in <sup>190</sup>Hg was performed with the Eurogam II array. The data have revealed the presence of cascades of magnetic dipole transitions with some unexpected properties. Unlike the MI bands previously observed in the heavier Hg isotopes, these structures have extremely large B(M1)/B(E2) ratios, The observation of a third dipole band with much lower B(M1)/B(E2) values in the same spin/excitation energy regime suggests that the bands may represent configurations occurring in different minima in the potential energy surface. Configuration-dependent Cranked Nilsson-Strutinsky calculations predict the presence of a minimum in the nuclear potential energy surface at a deformation of ε ≅ 0.2, γ ≅ -90°, occurring when a proton is excited across the Z = 82 shell-gap into an h<sub>9/2</sub> orbital. It is suggested that the bands exhibiting anomalously large B(M1)/B(E2) ratios may be associated with this minimum.</p>}},
  author       = {{Wilson, A. N. and Timár, J. and Ahmad, I. and Astier, A. and Azaiez, F. and Bergström, M. H. and Blumenthal, D. J. and Crowell, B. and Carpenter, M. P. and Ducroux, L. and Gall, B. J.P. and Hannachi, F. and Hübel, H. and Khoo, T. L. and Janssens, R. V.F. and Korichi, A. and Lauritsen, T. and Lopez-Martens, A. and Meyer, M. and Nisius, D. and Paul, E. S. and Porquet, M. G. and Redon, N. and Sharpey-Schafer, J. F. and Wadsworth, R. and Wilson, J. N. and Ragnarsson, I.}},
  issn         = {{0370-2693}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{1-4}},
  pages        = {{6--14}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{Magnetic dipole bands in <sup>190</sup>Hg : First evidence of excitations across the Z = 82 sub-shell in Hg nuclei}},
  url          = {{http://dx.doi.org/10.1016/S0370-2693(01)00332-X}},
  doi          = {{10.1016/S0370-2693(01)00332-X}},
  volume       = {{505}},
  year         = {{2001}},
}