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The yrast superdeformed band in 194Pb. Differences with 192Hg

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  • B.J.P. Gall
  • I. Deloncle
  • M.-G. Porquet
  • F. Hannachi
  • M. Aïche
  • F. Azaiez
  • G. Bastin
  • C.W. Beausang
  • R. Béraud
  • C. Bourgeois
  • R.M. Clark
  • R. Duffait
  • J. Duprat
  • K. Hauschild
  • H. Hübel
  • M. Kaci
  • A. Korichi
  • Y. Le Coz
  • M. Meyer
  • E.S. Paul
  • N. Perrin
  • N. Poffé
  • N. Redon
  • C. Schück
  • H. Sergolle
  • J.F. Sharpey-Schafer
  • A.G. Smith
  • R. Wadsworth
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<mark>Journal publication date</mark>1995
<mark>Journal</mark>Physics Letters B
Issue number2
Volume345
Number of pages7
Pages (from-to)124-130
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The yrast superdeformed (SD) structure of 194Pb has been studied using the EUROGAM γ-ray spectrometer. New results have been obtained at low as well as at high spin values. At low frequency, the SD band has been extended to the lowest-spin SD state ever observed in the A ∼ 190 region. The energies of 194Pb and 192Hg SD bands are identical for ω < 0.25 MeV. However, they diverge for higher frequency, which rules out the idea that these two SD bands are identical. Moreover, the SD band of 194Pb is populated at lower spin values than that of 192Hg and de-excites towards normally-deformed (ND) states at a spin value lower than that of 192Hg. This suggests that the barrier separating the SD and ND minima in the potential energy surface is higher in 194Pb than in 192Hg.