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First observation of a collective dipole rotational band in the A∼200 mass region

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  • R.M. Clark
  • R. Wadsworth
  • E.S. Paul
  • C.W. Beausang
  • I. Ali
  • A. Astier
  • D.M. Cullen
  • P.J. Dagnall
  • P. Fallon
  • M.J. Joyce
  • M. Meyer
  • N. Redon
  • P.H. Regan
  • W. Nazarewicz
  • R. Wyss
<mark>Journal publication date</mark>1992
<mark>Journal</mark>Physics Letters B
Issue number3-4
Number of pages5
Pages (from-to)247-251
Publication StatusPublished
<mark>Original language</mark>English


The nucleus 198Pb was populated via the 186W(17O,5n)198Pb reaction at beam energies of 92 and 98 MeV. A highly regular rotational ΔI=1 band has been found. Angular correlation measurements confirm the transitions to be dipoles. Assuming M1 multipolarity for these transitions the experimental data are interpreted in terms of a configuration of oblate shape. This is the first such collective oblate structure identified in the A∼200 mass region.