High-resolution singles and 4096×2048 Ge(Li)-Ge(Li) coincidence-spectrum measurements have been made to clarify the properties of the $\beta$ and $\gamma$ vibrational bands in ${}_{}{}^{152}{}_{}{}^{}\mathrm{Sm}$. A $2_{\gamma }\to 2_{\beta }$ transition is placed from coincidence experiments and $\frac{B (E2;2_{\gamma }\to 2_{\beta })}{B (E2;2_{\gamma }\to 2_g)}=1.3\mathrm{}\pm 0.4$. The $\frac{B (E2;3_{\gamma }\to 2_{\beta })}{B (E2;3_{\gamma }\to 2_g)}<0.6\mathrm{}$. Of the six transitions out of the $2_{\gamma }$ and $2_{\beta }$ levels, the intensities of four were revised from coincidence measurements and new branching ratios obtained. The $2_{\gamma }\to 4_g$ transition intensity is shown to be too low to allow a one-parameter fit to the $\gamma$-band branching ratios.

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