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The European Physical Journal A

, Volume 15, Issue 1–2, pp 175–179 | Cite as

New insights into neutron-rich nuclei at high spin

  • J.H. Hamilton
  • A.V. Ramayya
  • J.K. Hwang
  • X.Y. Luo
  • J.O. Rasmussen
  • E.F. Jones
  • X.Q. Zhang
  • S.J. Zhu
  • P.M. Gore
  • T.N. Ginter
  • I.Y. Lee
  • R.V.F. Janssens
  • I. Ahmed
  • J.D. Cole
  • W. Greiner
  • G. Ter-Akopian
  • Yu. Oganessian
Article

Abstract:

With new high statistic data, new isotopes and new high-spin structures are observed in neutron-rich nuclei populated in the spontaneous fission of 252Cf. The 135Te levels are extended, and many new levels in 139,141Ba observed. The coexistence of collective and single particle-hole states is found in 135Te. The N = 83 135Te and 139Ba show marked differences associated with differences in their particle and hole states. New levels in 141Ba complete evidence for two opposite-parity doublets characteristic of stable octupole deformation. In 114,116Pd a second backbend is observed for the first time in this mass region and the backbend in 118Pd occurs earlier than in 112-116Pd because of a reduction in pairing. Gamma-type vibrational bands are seen up to 13+ to 15+ in 104,106Mo, 108-112Ru, and 112-116Pd. Their behavior reflects prolate to triaxial shapes in these nuclei. The levels of 162,164Gd are observed for the first time. As N increases toward mid-shell at 104, the moments of inertia in N = 100 164Gd show an unexpected decrease compared to N = 98 162Gd. The levels in 162,164Gd form remarkable shifted identical bands with nuclei separated by 2n, 2p, α, and 2α.

PACS. 25.85.Ca Spontaneous fission – 27.60.+j 90 ⩽ A ⩽ 149 – 27.60.+q 150 ⩽ A ⩽ 189 – 21.60.-n Nuclear-structure models and methods 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2002

Authors and Affiliations

  • J.H. Hamilton
    • 1
  • A.V. Ramayya
    • 1
  • J.K. Hwang
    • 1
  • X.Y. Luo
    • 1
  • J.O. Rasmussen
    • 3
  • E.F. Jones
    • 1
    • 4
  • X.Q. Zhang
    • 1
  • S.J. Zhu
    • 1
    • 5
  • P.M. Gore
    • 1
  • T.N. Ginter
    • 3
  • I.Y. Lee
    • 3
  • R.V.F. Janssens
    • 6
  • I. Ahmed
    • 6
  • J.D. Cole
    • 1
    • 7
  • W. Greiner
    • 8
  • G. Ter-Akopian
    • 2
  • Yu. Oganessian
    • 9
  1. 1.Physics Department, Vanderbilt University, Nashville, TN 37235, USAUSA
  2. 2.Joint Institute for Heavy Ion Research, Oak Ridge, TN 37835, USAUSA
  3. 3.Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USAUSA
  4. 4.Universidade de Coimbra, Coimbra, PortugalPortugal
  5. 5.Physics Department, Tsinghua University, Beijing, PRCChina
  6. 6.Argonne National Laboratory, Argonne, IL 60439, USAUSA
  7. 7.Idaho National Environmental and Engineering Laboratory, Idaho Falls, ID 83415, USAUSA
  8. 8.Institute of Theoretical Physics, Goethe University, Frankfurt am Main, GermanyGermany
  9. 9.Flerov Laboratory for Nuclear Reactions, JINR, Dubna, RussiaRussia

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