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Evolution of nuclear shapes in odd-mass yttrium and niobium isotopes from lifetime measurements following fission reactions

  • Hagen, T.W.
  • Görgen, A.
  • Korten, W.
  • Grente, L.
  • Salsac, M.
  • Farget, F.
  • Ragnarsson, I.
  • Braunroth, T.
  • Bruyneel, B.
  • Celikovic, I.
  • Clément, E.
  • De France, G.
  • Delaune, O.
  • Dewald, A.
  • Dijon, A.
  • Hackstein, M.
  • Jacquot, B.
  • Litzinger, J.
  • Ljungvall, J.
  • Louchart, C.
  • And 9 more
Publication Date
Mar 01, 2017
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Lifetimes of excited states in ${}^{99}$Y , ${}^{101}$Y, ${}^{101}$Nb, ${}^{103}$Nb, and ${}^{105}$Nb were measured in an experiment using the recoil distance Doppler shift method at GANIL (Grand Accélérateur National d’Ions Lourds). The neutron-richnuclei were produced in fission reactions between a ${}^{238}$U beam and a ${}^9$Be target. Prompt γ rays were measuredwith the EXOGAM array and correlated with fission fragments that were identified in mass and atomic numberwith the VAMOS$\ {++}$ spectrometer. The measured lifetimes, together with branching ratios, provide $\it B(M1)$ and$\it B(E2)$ values for the strongly coupled rotational bands built on the [422]5/2$^+$ ground state in the Y and Nb nucleiwith neutron number N $\geq$ 60. The comparison of the experimental results with triaxial particle-rotor calculationsprovides information about the evolution of the nuclear shape in this mass region.

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