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

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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.

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Author information

Author notes

  1. B. Weiss & V. Barci

    Present address: Université de Nice, F-06108, Nice Cedex, France

  2. Gh. Căta-Danil

    Present address: National Institute for Physics and Nuclear Engineering, R-769000, Bucharest, Romania

Authors and Affiliations

  1. Institut des Sciences Nucléaires, IN2P3-CNRS/Université Joseph Fourier, 38026, Grenoble-Cedex, France

    A. Gizon, B. Weiss, J. Genevey, J. Gizon, V. Barci & Gh. Căta-Danil

  2. CSNSM, IN2P3-CNRS, Bt. 104, 91405, Campus Orsay, France

    P. Paris, C. F. Liang, J. S. Dionisio & Ch. Vieu

  3. Institut de Physique Nucléaire, IN2P3-CNRS, B.P. 1, 91406, Orsay-Cedex, France

    J. M. Lagrange & M. Pautrat

  4. I.A.A. Université Libre de Bruxelles, Boulevard du Triomphe, 1050, Brussels, Belgium

    J. Vanhorenbeeck

  5. Institute of Nuclear Research, Pf. 51, 4001, Debrecen, Hungary

    L. Zolnai

  6. Departamento de Física Atómica Molecular y Nuclear, Universidad de Sevilla, Aptdo. 1065, 41080, Sevilla, Spain

    J. M. Arias

  7. Departamento de Física Aplicada, ESII, Universidad de Sevilla, Sevilla, Spain

    J. Barea

  8. Institute of Experimental Physics, Warsaw University, Hoża 69, 00681, Warsaw, Poland

    Ch. Droste

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  1. A. Gizon
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Correspondence to A. Gizon.

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Communicated by J. Äystö

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Gizon, A., Weiss, B., Paris, P. et al. Level structure of 123Cs observed from 123Ba decay and described using the IBFM and CQPC models. Eur. Phys. J. A 8, 41–58 (2000). https://doi.org/10.1007/s10050-000-4503-0

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