Level Properties of ${}_{}{}^{94}{}_{}{}^{}\mathrm{Mo}$, ${}_{}{}^{98}{}_{}{}^{}\mathrm{Mo}$, and ${}_{}{}^{100}{}_{}{}^{}\mathrm{Mo}$ Investigated via Multiple Coulomb Excitation

The low-lying states of ${}_{}{}^{94,98,100}{}_{}{}^{}\mathrm{Mo}$ have been investigated via multiple Coulomb excitation effected with 7.2-MeV $\alpha$ particles and 35- to 44.8-MeV oxygen projectiles. In the three isotopes studied $2^{+}$ and $4^{+}$ levels were excited up to 2.1 MeV. The double $E2\mathrm{}$ excitation of a $0^{+}$ level at 694.4 keV in ${}_{}{}^{100}{}_{}{}^{}\mathrm{Mo}$, very close in energy to the first $2^{+}$ excited state, was observed. The $E2\mathrm{}$ transition between the $0^{+\prime }$ level and the first $2^{+}$ state is strongly enhanced, i.e., $\frac{B(E2;0^{+\prime }\to 2^{+})}{B(E2;2^{+}\to 0^{+})}=1.8\mathrm{}\pm 0.3$. The values obtained for the ratio $\frac{B(E2;2^{+\prime }\to 2^{+})}{B(E2;2^{+}\to 0^{+})}$ and the ratio $\frac{B(E2;4^{+}\to 2^{+})}{B(E2;2^{+}\to 0^{+})}$ are 2.6 ± 0.6, 2.5 ± 0.4, 1.69 ± 0.22 and 1.53 ± 0.24, 2.3 ± 0.3, 1.85 ± 0.19, respectively, for ${}_{}{}^{94}{}_{}{}^{}\mathrm{Mo}$, ${}_{}{}^{98}{}_{}{}^{}\mathrm{Mo}$, and ${}_{}{}^{100}{}_{}{}^{}\mathrm{Mo}$. States at 2533.7, 2017.6, and 1908.1 keV have been excited in ${}_{}{}^{94}{}_{}{}^{}\mathrm{Mo}$, ${}_{}{}^{98}{}_{}{}^{}\mathrm{Mo}$, and ${}_{}{}^{100}{}_{}{}^{}\mathrm{Mo}$, respectively. These states are interpreted to be the result of direct $E3\mathrm{}$ Coulomb excitation. Their $B(E3,0^{+}\to 3^{-})$ values are 6.2 ± 1.2 (${}_{}{}^{94}{}_{}{}^{}\mathrm{Mo}$), 13.3 ± 1.3 (${}_{}{}^{98}{}_{}{}^{}\mathrm{Mo}$), and 13.2 ± 1.7 (${}_{}{}^{100}{}_{}{}^{}\mathrm{Mo}$) × ${10}^{-2\mathrm{}}$ ${\mathit{e}}^2$${\mathrm{b}}^3$ which represent enhancements of 17, 33, and 32, respectively.