The European Physical Journal A

, Volume 8, Issue 1, pp 41–58

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

Authors

    • Institut des Sciences NucléairesIN2P3-CNRS/Université Joseph Fourier
  • B. Weiss
    • Institut des Sciences NucléairesIN2P3-CNRS/Université Joseph Fourier
  • P. Paris
    • CSNSM
  • C. F. Liang
    • CSNSM
  • J. Genevey
    • Institut des Sciences NucléairesIN2P3-CNRS/Université Joseph Fourier
  • J. Gizon
    • Institut des Sciences NucléairesIN2P3-CNRS/Université Joseph Fourier
  • V. Barci
    • Institut des Sciences NucléairesIN2P3-CNRS/Université Joseph Fourier
  • Gh. Căta-Danil
    • Institut des Sciences NucléairesIN2P3-CNRS/Université Joseph Fourier
  • J. S. Dionisio
    • CSNSM
  • J. M. Lagrange
    • Institut de Physique Nucléaire
  • M. Pautrat
    • Institut de Physique Nucléaire
  • J. Vanhorenbeeck
    • I.A.A. Université Libre de BruxellesBoulevard du Triomphe
  • Ch. Vieu
    • CSNSM
  • L. Zolnai
    • Institute of Nuclear Research
  • J. M. Arias
    • Departamento de Física Atómica Molecular y NuclearUniversidad de Sevilla
  • J. Barea
    • Departamento de Física AplicadaESII, Universidad de Sevilla
  • Ch. Droste
    • Institute of Experimental PhysicsWarsaw University
Article

DOI: 10.1007/s10050-000-4503-0

Cite this article as:
Gizon, A., Weiss, B., Paris, P. et al. Eur. Phys. J. A (2000) 8: 41. doi:10.1007/s10050-000-4503-0

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 Iπ = 11/2, T1/2 = 1.7 s isomer, bandhead of the h11/2 band, is confirmed. Its excitation energy equals 156.3 keV. A new T1/2 = 114 ns isomer has been established at 232 keV using the in-beam recoil catcher technique. It is assigned to the Iπ = 9/2+ bandhead of the gpg9/2 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 levels23.20.Lv Gamma transitions and level energies23.20.Nx Internal conversion21.60.Ev Collective models27.60.+j 90 ≤ A ≤ 149

Copyright information

© Società Italiana di Fisica Springer-Verlag 2000