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Structure studies of 257Db through combined {\alpha}, {\gamma} and internal-conversion-electron spectroscopy
P. Brionnet, A. Lopez-Martens, O. Dorvaux, Z. Asfari, M. L. Chelnokov, V. I. Chepigin, H. Faure, B. Gall, K. Hauschild, A. V. Isaev, I. N. Izosimov, A. A. Kuznetsova, O. N. Malyshev, R. S Mukhin, J. Piot, A. G. Popeko, Y. A. Popov, K. Rezynkina, B. Sailaubekov, E. A. Sokol, A. I. Svirikhin, M. S. Tezekbayeva, A. V. Yeremin, N. I. Zamyatin

Structure studies of 257Db through combined α, γ and internal-conversion-electron spectroscopy
This work reports on the study of the decay properties along the $^{257}$Db decay chain using the GABRIELA setup. The first observation of a high-K isomer in $^{257}$Db is presented. In addition, an unreported $α$-decay branch in $^{249}$Md has been evidenced, allowing to constrain the differences in energy of the $α$-decaying levels in $^{249}$Md, $^{253}$Lr and $^{257}$Db. Finally, the combination of the observed fine structure $α$-decay from the high-spin state in $^{257}$Db with the firs…