Level structure of 123Cs observed from 123Ba decay and described using the IBFM and CQPC models
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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 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.
PACS21.10.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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