The European Physical Journal A

, Volume 8, Issue 1, pp 41–58 | Cite as

Level structure of 123Cs observed from 123Ba decay and described using the IBFM and CQPC models

  • A. Gizon
  • B. Weiss
  • P. Paris
  • C. F. Liang
  • J. Genevey
  • J. Gizon
  • V. Barci
  • Gh. Căta-Danil
  • J. S. Dionisio
  • J. M. Lagrange
  • M. Pautrat
  • J. Vanhorenbeeck
  • Ch. Vieu
  • L. Zolnai
  • J. M. Arias
  • J. Barea
  • Ch. Droste
Article

Abstract

The decay of 123Ba to 123Cs has been studied with mass-separated sources. Singles spectra of γ-rays, X-rays and conversion electrons as well as γ - γ - t, γ - e - t, and X - e - t coincidences were recorded. A level scheme of 123Cs has been constructed including 26 new excited states and 82 transitions. The existence of a I π = 11/2, T 1/2 = 1.7 s isomer, bandhead of the h 11/2 band, is confirmed. Its excitation energy equals 156.3 keV. A new T 1/2 = 114 ns isomer has been established at 232 keV using the in-beam recoil catcher technique. It is assigned to the I π = 9/2+ bandhead of the gpg 9/2 band. Collective bands based on the 1/2+ ground state and first 3/2+ excited state are proposed. The level structure is described in the frame of the interacting boson-fermion and core-quasiparticle coupling models.

PACS

21.10.Re Collective levels 23.20.Lv Gamma transitions and level energies 23.20.Nx Internal conversion 21.60.Ev Collective models 27.60.+j 90 ≤ A ≤ 149 

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Copyright information

© Società Italiana di Fisica Springer-Verlag 2000

Authors and Affiliations

  • A. Gizon
    • 1
  • B. Weiss
    • 1
  • P. Paris
    • 2
  • C. F. Liang
    • 2
  • J. Genevey
    • 1
  • J. Gizon
    • 1
  • V. Barci
    • 1
  • Gh. Căta-Danil
    • 1
  • J. S. Dionisio
    • 2
  • J. M. Lagrange
    • 3
  • M. Pautrat
    • 3
  • J. Vanhorenbeeck
    • 4
  • Ch. Vieu
    • 2
  • L. Zolnai
    • 5
  • J. M. Arias
    • 6
  • J. Barea
    • 7
  • Ch. Droste
    • 8
  1. 1.Institut des Sciences NucléairesIN2P3-CNRS/Université Joseph FourierGrenoble-CedexFrance
  2. 2.CSNSMCampus OrsayFrance
  3. 3.Institut de Physique NucléaireOrsay-CedexFrance
  4. 4.I.A.A. Université Libre de BruxellesBoulevard du TriompheBrusselsBelgium
  5. 5.Institute of Nuclear ResearchDebrecenHungary
  6. 6.Departamento de Física Atómica Molecular y NuclearUniversidad de SevillaSevillaSpain
  7. 7.Departamento de Física AplicadaESII, Universidad de SevillaSevillaSpain
  8. 8.Institute of Experimental PhysicsWarsaw UniversityWarsawPoland

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