Determination ofB(E2,0+→2+′)for some even-even nuclei in and near the rare-earth region

$\alpha$ particles in the 11.5-13.5 MeV energy range have been employed to Coulomb excite the $2^{+}$ members of the $\gamma$-vibrational band of nine even-even nuclei in the $158\le A\le 186$ mass region. The $B(E2,0^{+}\to 2^{+\prime })$ values were then determined by energy analyzing the backscattered projectiles. The results for ${}_{}{}^{158,160}{}_{}{}^{}\mathrm{Gd}$, ${}_{}{}^{162,164}{}_{}{}^{}\mathrm{Dy}$, ${}_{}{}^{166,168,170}{}_{}{}^{}\mathrm{Er}$, and ${}_{}{}^{184,186}{}_{}{}^{}\mathrm{W}$ are 0.106 ± 0.015, 0.104 ± 0.004, 0.130 ± 0.005, 0.121 ± 0.005, 0.140 ± 0.006, 0.130 ± 0.005, 0.107 ± 0.006, 0.138 ± 0.006, and 0.139 ± 0.004 ($e^2{b}^2$), respectively.