Structure studies of 257Db through combined α, γ, and internal-conversion-electron spectroscopy
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.
21 July 2025American Physical Society
Physical Review C
2025#112Issue 11 - 11 pp.
This work reports on the study of the decay properties along the 257Db decay chain using the GABRIELA setup. The first observation of a high-K isomer in 257Db is presented. In addition, an unreported α-decay branch in 249Md has been evidenced, allowing constraints the differences in energy of the α-decaying levels in 249Md, 253Lr and 257Db. Finally, the combination of the observed fine structure α-decay from the high-spin state in 257Db with the first observation the internal decay in 253Lr 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 257Db is suggested, and the implications of such a change are also discussed.
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Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, F-67000, France
IJClab, Université Paris Saclay, CNRS, Orsay, F-91405, France
FLNR, JINR, Dubna, Russian Federation
Dubna State University, Dubna, Russian Federation
GANIL, Cean, France
L.N. Gumilyov Eurasian National University, Astana, Kazakhstan
The Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
VBLHEP, JINR, Dubna, Russian Federation
Université de Strasbourg
IJClab
FLNR
Dubna State University
GANIL
L.N. Gumilyov Eurasian National University
The Institute of Nuclear Physics
VBLHEP
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