This work reports on the study of the decay properties along the ${}^{257}\mathrm{Db}$ decay chain using the GABRIELA setup. The first observation of a high-K isomer in ${}^{257}\mathrm{Db}$ is presented. In addition, an unreported $\alpha$-decay branch in ${}^{249}\mathrm{Md}$ has been evidenced, allowing constraints the differences in energy of the $\alpha$-decaying levels in ${}^{249}\mathrm{Md}, {}^{253}\mathrm{Lr}$ and ${}^{257}\mathrm{Db}$. Finally, the combination of the observed fine structure $\alpha$-decay from the high-spin state in ${}^{257}\mathrm{Db}$ with the first observation the internal decay in ${}^{253}\mathrm{Lr}$ requires a revision of the level and decay scheme. In particular, a change of parity for the high-spin state from $9/2^{+}$ to $9/2^{-}$ in ${}^{257}\mathrm{Db}$ is suggested, and the implications of such a change are also discussed.

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• Alpha decay
• Energy levels
• Isomer decays
• Nuclear structure & decays
• A ≥ 220