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Alpha-gamma decay studies of 258Db and its (grand)daughter nuclei 254Lr and 250Md

  • M. VostinarEmail author
  • F. P. Heßberger
  • D. Ackermann
  • B. Andel
  • S. Antalic
  • M. Block
  • Ch. Droese
  • J. Even
  • S. Heinz
  • Z. Kalaninova
  • I. Kojouharov
  • M. Laatiaoui
  • A. K. Mistry
  • J. Piot
  • H. Savajols
Regular Article - Experimental Physics
  • 47 Downloads

Abstract.

The superheavy isotope 258Db was produced in the 209Bi(50Ti, 1n)258Db reaction at GSI, Germany. A detailed \( \alpha\)-spectroscopy study of this isotope and its \( \alpha\)-decay daughter products was performed. Two long-lived \( \alpha\)-decaying states in 258Db are observed. A spin-parity of \( 0^{-}\) is tentatively assigned to the ground state for which a half-life of \( 2.17 \pm 0.36\) s is determined. Spins and parities of either \( 5^{+}\) or \( 10^{-}\) are proposed for the isomeric state found at an excitation energy of 51 keV with a half-life of \( 4.41 \pm 0.21\) s. The \( \alpha\) -decay daughter isotope 254Lr displays a similar behavior. A half-life of \( 11.9 \pm 0.9\) s is determined for the 254Lr ground state which is tentatively assigned a spin-parity of \( 4^{+}\). The isomeric level of this isotope placed at 108 keV with a half-life of \( 20.3 \pm 4.2\) s is tentatively assigned a spin-parity of \( 1^{-}\). Two long-lived \( \alpha\)-decaying states are observed in the granddaughter isotope 250Md . The ground state has a half-life of \( 59.5 \pm 9.1\) s. A half-life of \( 42.4 \pm 4.5\) 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 \( \alpha\)-\( \gamma\) coincidences.

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Copyright information

© SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • M. Vostinar
    • 1
    Email author
  • F. P. Heßberger
    • 2
    • 3
  • D. Ackermann
    • 1
    • 2
  • B. Andel
    • 4
  • S. Antalic
    • 4
  • M. Block
    • 2
    • 3
    • 5
  • Ch. Droese
    • 6
  • J. Even
    • 3
  • S. Heinz
    • 2
  • Z. Kalaninova
    • 4
  • I. Kojouharov
    • 2
  • M. Laatiaoui
    • 2
    • 3
    • 5
  • A. K. Mistry
    • 2
    • 3
  • J. Piot
    • 1
  • H. Savajols
    • 1
  1. 1.GANIL, CEA/DSM-CNRS/IN2P3Caen Cedex 5France
  2. 2.GSI - Helmholtzzentrum für Schwerionenforschung GmbHDarmstadtGermany
  3. 3.Helmholtz Institut MainzMainzGermany
  4. 4.Comenius University in BratislavaBratislavaSlovakia
  5. 5.Johannes Gutenberg-UniversitätMainzGermany
  6. 6.Ernst-Moritz-Arndt UniversitätGreifswaldGermany

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