Deexcitation of the 931.1 keV 2₂⁺-State of Cd¹⁵²

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The gamma-ray spectrum and the conversion-electron spectrum are measured in the decay of the Tb¹⁵² activity. The L-subshell electron lines of the 586.7 keV 2₂⁺→2₁⁺ transition are separated by the ion-free beta-ray spectrometer. The M1-E2 mixing ratio, δ², and the dimensionless ratio X of E0-E2 mixing of the 586.7 keV transition are obtained to be δ²≤0.16 and 0.034≤X≤0.038, respectively. The E2 branching ratio B(E2; 2₂⁺→0_g⁺): B(E2; 2₂⁺→2₁⁺): B(E2; 2₂⁺→0₁⁺) is determined to be 0.023 : 1.0 : 5.6.