https://doi.org/10.1140/epja/i2019-12701-y
Regular Article - Experimental Physics
Alpha-gamma decay studies of 258Db and its (grand)daughter nuclei 254Lr and 250Md
1
GANIL, CEA/DSM-CNRS/IN2P3, bvd. H. Becquerel, 14074, Caen Cedex 5, France
2
GSI - Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany
3
Helmholtz Institut Mainz, 5099, Mainz, Germany
4
Comenius University in Bratislava, 84248, Bratislava, Slovakia
5
Johannes Gutenberg-Universität, 55099, Mainz, Germany
6
Ernst-Moritz-Arndt Universität, 17489, Greifswald, Germany
* e-mail: mvostinar@gmail.com
Received:
27
August
2018
Accepted:
30
December
2018
Published online:
14
February
2019
The superheavy isotope 258Db was produced in the 209Bi(50Ti, 1n)258Db reaction at GSI, Germany. A detailed -spectroscopy study of this isotope and its -decay daughter products was performed. Two long-lived -decaying states in 258Db are observed. A spin-parity of is tentatively assigned to the ground state for which a half-life of s is determined. Spins and parities of either or are proposed for the isomeric state found at an excitation energy of 51 keV with a half-life of s. The -decay daughter isotope 254Lr displays a similar behavior. A half-life of s is determined for the 254Lr ground state which is tentatively assigned a spin-parity of . The isomeric level of this isotope placed at 108 keV with a half-life of s is tentatively assigned a spin-parity of . Two long-lived -decaying states are observed in the granddaughter isotope 250Md . The ground state has a half-life of s. A half-life of s is measured for the isomeric state positioned at an excitation energy of 123 keV. Partial, tentative level schemes for 254Lr, 250Md and 246Es are proposed based on the - coincidences.
© SIF, Springer-Verlag GmbH Germany, part of Springer Nature, 2019