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Search for production of superheavy elements via “fusion after instantaneous fission” in the reaction238U+208Pb

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

Superheavy elements (SHE) might be formed via a reaction mechanism called “fusion after instantaneous fission”, which is supposed to occur during the collision of a deformed very heavy nucleus with a spherical one. We bombarded natural uranium targets with lead ions and searched for alpha-emitting and spontaneously fissioning reaction products. Different techniques were used: a rotating wheel, a gas jet system and a radiochemical procedure. No SHE have been found. The upper cross section limits are between 10−33 cm2 and 10−34 cm2 within the half-life range from 1 ms to 1 year. In addition, the production cross sections of some Cm and Cf isotopes and of Am fission isomers were determined.

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Author notes

  1. R. Faß

    Present address: Chemische Werke Hüls AG, D-4370, Marl, FRG

Authors and Affiliations

  1. Kernchemie, FB 14, Philipps-Universität, Marburg, Germany

    T. Lund, D. Hirdes, H. Jungclas, D. Molzahn, P. Vater & R. Brandt

  2. II. Physikalisches Institut, Justus-Liebig-Universität, Giessen, Germany

    P. Lemmertz, R. Faß & H. Wollnik

  3. Gesellschaft für Schwerionenforschung, Darmstadt, Germany

    H. Gäggeler

Authors
  1. T. Lund
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  2. D. Hirdes
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  3. H. Jungclas
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  4. D. Molzahn
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  5. P. Vater
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  6. R. Brandt
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  7. P. Lemmertz
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  8. R. Faß
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  9. H. Wollnik
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  10. H. Gäggeler
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Additional information

We wish to thank the UNILAC crew for their successful efforts to deliver intense lead beams and the GSI target laboratory for carefully manufacturing the uranium targets. Thanks are due to Prof. G. Herrmann (GSI, Darmstadt) and Prof. K. Dietrich (TU, München) for stimulating discussions. Financial support of the BMFT, Bonn, and of GSI, Darmstadt, is gratefully acknowledged.

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Lund, T., Hirdes, D., Jungclas, H. et al. Search for production of superheavy elements via “fusion after instantaneous fission” in the reaction238U+208Pb. Z Physik A 303, 115–121 (1981). https://doi.org/10.1007/BF01420268

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  • DOI: https://doi.org/10.1007/BF01420268

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