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 Cǎta-Danil, J. S. Dionisio, J. M. Lagrange, M. Pautrat, J. Vanhorenbeeck, Ch Vieu, L. Zolnai, J. M. Arias, J. Barea, Ch Droste

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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 πg9/2 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.

Original languageEnglish
Pages (from-to)41-58
Number of pages18
JournalEuropean Physical Journal A
Issue number1
Publication statusPublished - Jan 1 2000

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Gizon, A., Weiss, B., Paris, P., Liang, C. F., Genevey, J., Gizon, J., Barci, V., Cǎta-Danil, G., Dionisio, J. S., Lagrange, J. M., Pautrat, M., Vanhorenbeeck, J., Vieu, C., Zolnai, L., Arias, J. M., Barea, J., & Droste, C. (2000). Level structure of 123Cs observed from 123Ba decay and described using the IBFM and CQPC models. European Physical Journal A, 8(1), 41-58. https://doi.org/10.1007/s10050-000-4503-0