Summary
The β decays of134Cs and the γ decays of134Ba have been investigated with an intermediate image β spectrometer and a scintillation spectrometer. From β-γ coincidences a new β decay of 335 keV endpoint has been revealed and the existence of a weak β decay on the 1 350 keV level of barium has been confirmed. From β-γ and γ-γ coincidences and from internal conversion coefficients, the relative intensity of the β decays and the multipolarity of γ transitions have been investigated. The five excited states of134Ba are assumed having energies of 795, 1 350, 1 395, 1 700 and 1 949 keV. Their spins and parities are 2+, 2+, 3+ or 4+, 3+ or 4+ and 4+.
Riassunto
È stato studiato il decadimento β del134Cs e il decadimento γ del134Ba con spettrografo β a immagine intermedia e con spettrografo a scintillazione. Misure di coincidenze β-γ hanno messo in evidenza un decadimento γ di energia massima 335 keV e hanno confermato l’ipotesi di un decadimento β molto debole sul livello di 1350 keV del134Ba. Le intensità relative dei decadimenti β e le multipolarità delle transizioni γ sono state ricavate da misure combinate di coincidenze β-γ, coincidenze γ-γ e coefficienti di conversione. Si propone uno schema di decadimento con stati eccitati de bario di 795, 1350, 1395, 1700 e 1949. I loro spin e parità risultano essere 2+, 2+, 3+ o 4+, 3+ o 4+, e 4+.
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Bertolini, G., Bettoni, M. & Lazzarini, E. Radioactivity of134Cs. Nuovo Cim 2, 273–289 (1955). https://doi.org/10.1007/BF02855919
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DOI: https://doi.org/10.1007/BF02855919