The experimental data for $\alpha$-decay half-lives to ground and excited states of deformed nuclei with $222⩽A⩽252$ and $88⩽Z⩽102$ are analyzed in the framework of the unified model for $\alpha$ decay and $\alpha$ capture. The branching ratios to excited states depend on the energy and the angular momentum of the $\alpha$ particle. The evaluated branching ratios for $0_{\mathrm{g}.\mathrm{s}.}^{+}\to 0_{\mathrm{g}.\mathrm{s}.}^{+},2^{+},4^{+}\hspace{0.5em}\alpha$ transitions in even-even nuclei agree with the experimental data. The experimental and calculated branching ratios for $\alpha$ transitions into more highly excited states are similar.

• Received 24 July 2009

DOI:https://doi.org/10.1103/PhysRevC.80.034603