Electron-γ directional correlation measurements have been done in ${}^{134}\mathrm{Ba}$ for the first time using an apparatus including cooled Si surface barrier detector for the electrons and HPGe for the γ’s. Experimental particle parameters for pure intense E2 transitions have been calculated from γγ and electron-γ results, giving $b_2\mathrm{}\left(605K\right)=1.31\mathrm{}\left(28\right)\mathrm{}$ and $b_2\mathrm{}\left(795K\right)=1.20\mathrm{}\left(23\right).$ Some mixed transitions were also analyzed. The $326K$ electron conversion ratio ${\alpha }_{326K}=14\mathrm{}\left(6\right)\mathrm{}\times {10}^{-2}$ was measured. An upper bound for the E0/E2 mixing ratio was estimated to the $2^{+\prime }\to 2^{+}(563\mathrm{}$ keV) transition by the $e\gamma$ interference E0/E2 method, giving $q_K^2\mathrm{}(E0/E2\mathrm{})\mathrm{}<~\mathrm{0.06.}$

• Received 29 January 1998

DOI:https://doi.org/10.1103/PhysRevC.58.1829