Spectroscopy along flerovium decay chains. III. Details on experiment, analysis, 282Cn, and spontaneous fission branches

A. Såmark-Roth, D. M. Cox, D. Rudolph, L. G. Sarmiento, M. Albertsson, B. G. Carlsson, J. L. Egido, P. Golubev, J. Heery, A. Yakushev, S. Åberg, H. M. Albers, M. Block, H. Brand, T. Calverley, R. Cantemir, R. M. Clark, Ch. E. Düllmann, J. Eberth, C. FahlanderU. Forsberg, J. M. Gates, F. Giacoppo, M. Götz, S. Götz, R.-D. Herzberg, Y. Hrabar, E. Jäger, D. Judson, J. Khuyagbaatar, B. Kindler, I. Kojouharov, J. V. Kratz, J. Krier, N. Kurz, L. Lens, J. Ljungberg, B. Lommel, J. Louko, C.-C. Meyer, A. Mistry, C. Mokry, P. Papadakis, E. Parr, J. L. Pore, I. Ragnarsson, J. Runke, M. Schädel, H. Schaffner, B. Schausten, D. A. Shaughnessy, P. Thörle-Pospiech, N. Trautmann, J. Uusitalo

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Abstract

Flerovium isotopes (element Z = 114) were produced in the fusion-evaporation reactions 48Ca+242,244Pu and studied with an upgraded TASISpec decay station placed in the focal plane of the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. Twenty-nine flerovium decay chains were identified by means of correlated implantation, α decay, and spontaneous fission events. Data analysis aspects and statistical assessments, primarily based on measured rates of various events, which laid the foundation for the comprehensive spectroscopic information on the flerovium decay chains, are presented in detail. Various decay scenarios of an excited state observed in 282Cn are examined in depth with the help of GEANT4 simulations and assessed by predictions of beyond mean-field calculations including triaxial shape degrees of freedom. Previous, revised, and newly derived fission probabilities of even-even superheavy nuclei are compared with various theoretical predictions.
Original languageEnglish
Article number024301
Number of pages12
JournalPhysical Review C
Volume107
Issue number2
DOIs
Publication statusPublished - 2023 Feb 6

Subject classification (UKÄ)

  • Subatomic Physics

Free keywords

  • Superheavy elements
  • Nuclear spectroscopy
  • Alpha decay
  • Spontaneous fission
  • E0 decay
  • Mean field theory

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