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Synthesis and properties of isotopes of the transactinides

  • Sigurd Hofmann EMAIL logo
Published/Copyright: March 8, 2019
Radiochimica Acta
From the journal Radiochimica Acta Volume 107 Issue 9-11

Abstract

Isotopes of transactinide elements have to be synthesized in nuclear reactions with light or heavy beam particles. The efficient production by neutron capture and subsequent β− decay as it is used for the production of isotopes of actinide elements up to fermium is no longer possible due to the lack of suitable target material. The content of this article is about the synthesis and the study of the decay properties of nuclei to which atomic, respectively proton numbers from Z = 104 to 118 could be unambiguously assigned by physical means. The results identified the reaction products as isotopes of new elements beyond the actinides, the transactinides. As such the elements received names given by the discovers ranging from rutherfordium for element 104 to oganesson for element 118 which completes the 7th row of the Periodic Table of the Elements. Intensive heavy ion beams, sophisticated target technology, efficient electromagnetic ion separators, and sensitive detector arrays were the prerequisites for discovery of the elements from Z = 107 to 118 during the years from 1981 to 2013. The results and the techniques are described. Also given is a historical introduction into early experiments and the theoretical predictions for a possible existence of an island of stability located at the crossing of the next closed shells for the protons and neutrons beyond the doubly magic nucleus 208Pb. The experimental results are compared with recent theoretical calculations on cross-sections and decay modes of these superheavy nuclei, respectively isotopes of superheavy elements. An outlook is given on further improvement of experimental facilities which will be needed for exploration of the extension and structure of the island of superheavy nuclei, in particular for searching for isotopes with longer half-lives predicted to be located in the south east and for isotopes of further new elements expected in the north-east direction of the island at the upper end of the chart of nuclei.

Keywords: Superheavy elements; superheavy nuclei; heavy-ion fusion reactions; α decay; spontaneous fission

Acknowledgment

This work was supported by the GSI Helmholtzzentrum für Schwerionenforschung through a guest contract agreed with the research director of GSI, K. Langanke, and the coordinator of the NUSTAR/FRS group, C. Scheidenberger. Earlier discussions with the late W. Greiner, V.I. Zagrebaev, and A. Sobiczewski are gratefully acknowledged. The author wishes to thank members and guests of the former GSI-SHIP group for pleasant cooperation and, in particular, its previous long term leader G. Münzenberg for continuous valuable support. The current article reproduces some text from an article published in J. Phys. G: Nucl. Part. Phys. 42, 114001 (2015). That article provides a wider comparison of experimental work on cold and hot fusion reactions based on targets of 208Pb, 209Bi and isotopes of actinides, respectively.

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Received: 2019-01-14
Accepted: 2019-02-04
Published Online: 2019-03-08
Published in Print: 2019-09-25

©2019 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. Editorial: 150 years of the Periodic Table of Chemical Elements
  3. Part A: Actinides and Transactinides
  4. Evolution of the periodic table through the synthesis of new elements
  5. Nuclear and chemical characterization of heavy actinides
  6. Direct mass measurements and ionization potential measurements of the actinides
  7. Relativity in the electronic structure of the heaviest elements and its influence on periodicities in properties
  8. The periodic table – an experimenter’s guide to transactinide chemistry
  9. Synthesis and properties of isotopes of the transactinides
  10. Part B: Nuclear Energy
  11. Homogenous recycling of transuranium elements from irradiated fast reactor fuel by the EURO-GANEX solvent extraction process
  12. Separation of trivalent actinides and lanthanides using various ‘N’, ‘S’ and mixed ‘N,O’ donor ligands: a review
  13. Separation of actinides from lanthanides associated with spent nuclear fuel reprocessing in China: current status and future perspectives
  14. Contamination of Fukushima Daiichi Nuclear Power Station with actinide elements
  15. Protactinium(V) in aqueous solution: a light actinide without actinyl moiety
  16. What do we know about actinides-proteins interactions?
  17. Part C: Medical Radionuclides
  18. Positron-emitting radionuclides for applications, with special emphasis on their production methodologies for medical use
  19. Radiochlorine: an underutilized halogen tool
  20. Radiobromine and radioiodine for medical applications
  21. Radiochemical aspects of alpha emitting radionuclides for medical application
  22. Chelators and metal complex stability for radiopharmaceutical applications
https://doi.org/10.1515/ract-2019-3104
Keywords for this article
Superheavy elements; superheavy nuclei; heavy-ion fusion reactions; α decay; spontaneous fission

Articles in the same Issue

  1. Frontmatter
  2. Editorial: 150 years of the Periodic Table of Chemical Elements
  3. Part A: Actinides and Transactinides
  4. Evolution of the periodic table through the synthesis of new elements
  5. Nuclear and chemical characterization of heavy actinides
  6. Direct mass measurements and ionization potential measurements of the actinides
  7. Relativity in the electronic structure of the heaviest elements and its influence on periodicities in properties
  8. The periodic table – an experimenter’s guide to transactinide chemistry
  9. Synthesis and properties of isotopes of the transactinides
  10. Part B: Nuclear Energy
  11. Homogenous recycling of transuranium elements from irradiated fast reactor fuel by the EURO-GANEX solvent extraction process
  12. Separation of trivalent actinides and lanthanides using various ‘N’, ‘S’ and mixed ‘N,O’ donor ligands: a review
  13. Separation of actinides from lanthanides associated with spent nuclear fuel reprocessing in China: current status and future perspectives
  14. Contamination of Fukushima Daiichi Nuclear Power Station with actinide elements
  15. Protactinium(V) in aqueous solution: a light actinide without actinyl moiety
  16. What do we know about actinides-proteins interactions?
  17. Part C: Medical Radionuclides
  18. Positron-emitting radionuclides for applications, with special emphasis on their production methodologies for medical use
  19. Radiochlorine: an underutilized halogen tool
  20. Radiobromine and radioiodine for medical applications
  21. Radiochemical aspects of alpha emitting radionuclides for medical application
  22. Chelators and metal complex stability for radiopharmaceutical applications
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