We identify a $J^{\pi }{=3\mathrm{}}_{\mathrm{ms}}^{+}$ state in ${}^{94}\mathrm{Mo}$. This identification is based on six $M1\mathrm{}$ and $E2\mathrm{}$ strengths and is the first identification of a $3_{\mathrm{ms}}^{+}$ state from $B\left(M1\mathrm{}\right)$ and $B\left(E2\mathrm{}\right)$ values. The transition strengths were determined from the measurement of Doppler shifts, branching ratios, and $E2\mathrm{}/M1\mathrm{}$ mixing ratios, obtained from $\gamma \gamma$ directional correlations following the ${}^{91}\mathrm{Zr}(\alpha ,n)$ reaction and the ${\beta }^{+}$ decay of ${}^{94}{\mathrm{Tc}}^m$. The interacting boson model agrees with the observations, which prove the $2^{+}$ mixed-symmetry states to be a building block in nuclear structure.

• Received 26 August 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.3775