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Review of even element super-heavy nuclei and search for element 120

  • S. HofmannEmail author
  • S. Heinz
  • R. Mann
  • J. Maurer
  • G. Münzenberg
  • S. Antalic
  • W. Barth
  • H. G. Burkhard
  • L. Dahl
  • K. Eberhardt
  • R. Grzywacz
  • J. H. Hamilton
  • R. A. Henderson
  • J. M. Kenneally
  • B. Kindler
  • I. Kojouharov
  • R. Lang
  • B. Lommel
  • K. Miernik
  • D. Miller
  • K. J. Moody
  • K. Morita
  • K. Nishio
  • A. G. Popeko
  • J. B. Roberto
  • J. Runke
  • K. P. Rykaczewski
  • S. Saro
  • C. Scheidenberger
  • H. J. Schött
  • D. A. Shaughnessy
  • M. A. Stoyer
  • P. Thörle-Pospiech
  • K. Tinschert
  • N. Trautmann
  • J. Uusitalo
  • A. V. Yeremin
Review

Abstract.

The reaction

54Cr$ + $248Cm

was investigated at the velocity filter SHIP at GSI, Darmstadt, with the intention to study production and decay properties of isotopes of element 120. Three correlated signals were measured, which occurred within a period of 279ms. The heights of the signals correspond with the expectations for a decay sequence starting with an isotope of element 120. However, a complete decay chain cannot be established, since a signal from the implantation of the evaporation residue cannot be identified unambiguously. Measured properties of the event chain are discussed in detail. The result is compared with theoretical predictions. Previously measured decay properties of even element super-heavy nuclei were compiled in order to find arguments for an assignment from the systematics of experimental data. In the course of this review, a few tentatively assigned data could be corrected. New interpretations are given for results which could not be assigned definitely in previous studies. The discussion revealed that the cross-section for production of element 120 could be high enough so that a successful experiment seems possible with presently available techniques. However, a continuation of the experiment at SHIP for a necessary confirmation of the results obtained in a relatively short irradiation of five weeks is not possible at GSI presently. Therefore, we decided to publish the results of the measurement and of the review as they exist now. In the summary and outlook section we also present concepts for the continuation of research in the field of super-heavy nuclei.

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • S. Hofmann
    • 1
    • 2
    Email author
  • S. Heinz
    • 1
  • R. Mann
    • 1
  • J. Maurer
    • 1
  • G. Münzenberg
    • 1
    • 3
  • S. Antalic
    • 4
  • W. Barth
    • 1
  • H. G. Burkhard
    • 1
  • L. Dahl
    • 1
  • K. Eberhardt
    • 5
  • R. Grzywacz
    • 6
    • 7
  • J. H. Hamilton
    • 8
  • R. A. Henderson
    • 9
  • J. M. Kenneally
    • 9
  • B. Kindler
    • 1
  • I. Kojouharov
    • 1
  • R. Lang
    • 1
  • B. Lommel
    • 1
  • K. Miernik
    • 6
    • 10
  • D. Miller
    • 7
  • K. J. Moody
    • 9
  • K. Morita
    • 11
  • K. Nishio
    • 12
  • A. G. Popeko
    • 13
  • J. B. Roberto
    • 6
  • J. Runke
    • 1
  • K. P. Rykaczewski
    • 6
  • S. Saro
    • 4
  • C. Scheidenberger
    • 1
  • H. J. Schött
    • 1
  • D. A. Shaughnessy
    • 9
  • M. A. Stoyer
    • 9
  • P. Thörle-Pospiech
    • 5
  • K. Tinschert
    • 1
  • N. Trautmann
    • 5
  • J. Uusitalo
    • 14
  • A. V. Yeremin
    • 13
  1. 1.GSI Helmholtzzentrum für SchwerionenforschungDarmstadtGermany
  2. 2.Institut für PhysikGoethe-Universität FrankfurtFrankfurtGermany
  3. 3.Manipal Centre for Natural SciencesManipal UniversityManipalIndia
  4. 4.Department of Nuclear Physics and BiophysicsComenius UniversityBratislavaSlovakia
  5. 5.Johannes Gutenberg-Universität MainzMainzGermany
  6. 6.Oak Ridge National LaboratoryOak RidgeUSA
  7. 7.University of TennesseeKnoxvilleUSA
  8. 8.Department of Physics and AstronomyVanderbuilt UniversityNashvilleUSA
  9. 9.Lawrence Livermore National LaboratoryLivermoreUSA
  10. 10.University of WarsawWarsawPoland
  11. 11.RIKEN Nishina Center for Accelerator-Based ScienceWako, SaitamaJapan
  12. 12.Japan Atomic Energy AgencyTokai, IbarakiJapan
  13. 13.Joint Institute for Nuclear ResearchDubnaRussian Federation
  14. 14.Department of PhysicsUniversity of JyväskyläJyväskyläFinland

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