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Main Authors: Brionnet, P., Lopez-Martens, A., Dorvaux, O., Asfari, Z., Chelnokov, M. L., Chepigin, V. I., Faure, H., Gall, B., Hauschild, K., Isaev, A. V., Izosimov, I. N., Kuznetsova, A. A., Malyshev, O. N., Mukhin, R. S, Piot, J., Popeko, A. G., Popov, Y. A., Rezynkina, K., Sailaubekov, B., Sokol, E. A., Svirikhin, A. I., Tezekbayeva, M. S., Yeremin, A. V., Zamyatin, N. I.
Format: Preprint
Published: 2025
Subjects:
Nuclear Experiment
Online Access:https://arxiv.org/abs/2507.01262
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Table of Contents:
  • 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 first observation the internal decay in $^{253}$Lr requires a revision of level and decay scheme. In particular, a change of parity for the high-spin state from 9/2$^{+}$ to 9/2$^{-}$ in the $^{257}$Db is suggested, and the implications of such a change are also discussed.

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