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Measurement of evaporation residue cross-sections of the reaction 30Si + 238U at subbarrier energies

  • Nuclear Structure and Reactions
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Abstract.

The reaction 30Si + 238U → 268Sg* was studied at beam energies close to the Coulomb barrier. At a center-of-mass energy of E c.m. = 144.0MeV for reactions at half thickness of the target we measured three decay chains of 263Sg produced by evaporation of five neutrons. The cross-section was ( 67+67 -37) pb. At E c.m. = 133.0MeV we measured three spontaneously fissioning nuclei which we assigned to the isotope 264Sg. The production cross-section was ( 10+10 -6) pb and a half-life of ( 120+126 -44) ms was determined. This half-life is a factor of twenty shorter than theoretical predictions. At E c.m. = 128.0MeV an upper cross-section limit of 15pb was measured. The cross-section data reveal a strong influence of the orientation of the deformed target nucleus on the production yield. Compared to excitation functions measured for the lighter system 16O + 238U → 254Fm*, a reduction of the fusion probability was observed at low beam energies indicating increasing competition from quasifission processes.

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Authors and Affiliations

  1. Gesellschaft für Schwerionenforschung mbH, D-64220, Darmstadt, Germany

    K. Nishio, S. Hofmann, F. P. Heßberger, D. Ackermann, S. Heinz, J. Khuyagbaatar, B. Kindler, I. Kojouharov, B. Lommel, R. Mann, M. Mazzocco, H. J. Schött & B. Sulignano

  2. Japan Atomic Energy Agency, 319-1195, Tokai, Ibaraki, Japan

    K. Nishio, H. Ikezoe, S. Mitsuoka, Y. Nagame, K. Tsukada & K. Tsuruta

  3. Institut für Kernphysik, Johann Wolfgang Goethe-Universität, D-60486, Frankfurt am Main, Germany

    S. Hofmann

  4. Department of Nuclear Physics, Comenius University, SK-84215, Bratislava, Slovakia

    S. Antalic & S. Saro

  5. Higher Institue of Technologies and Applied Sciences, 10400, Habana, Cuba

    V. F. Comas & J. A. Heredia

  6. Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, PRC

    Z. Gan

  7. St. Petersburg State University, 198504, Stari Petergof, St. Petersburg, Russia

    J. Khuyagbaatar

  8. CUPP, University of Oulu, FIN-86801, Pyhäjärvi, Finland

    P. Kuusiniemi

  9. Laboratory of Nuclear Science, Tohoku University, 982-0826, Sendai, Japan

    T. Ohtsuki

  10. Flerov Laboratory of Nuclear Reactions, JINR, 141 980, Dubna, Russia

    A. G. Popeko, A. Svirikhin & A. V. Yeremin

  11. Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D-55099, Mainz, Germany

    B. Sulignano

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  1. K. Nishio
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  2. S. Hofmann
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  3. F. P. Heßberger
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  4. D. Ackermann
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  5. S. Antalic
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  6. V. F. Comas
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  7. Z. Gan
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  8. S. Heinz
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  9. J. A. Heredia
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  10. H. Ikezoe
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  11. J. Khuyagbaatar
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  12. B. Kindler
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  13. I. Kojouharov
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  14. P. Kuusiniemi
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  15. B. Lommel
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  16. R. Mann
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  17. M. Mazzocco
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  18. S. Mitsuoka
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  19. Y. Nagame
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  20. T. Ohtsuki
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  21. A. G. Popeko
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  22. S. Saro
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  23. H. J. Schött
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  24. B. Sulignano
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  25. A. Svirikhin
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  26. K. Tsukada
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  28. A. V. Yeremin
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Corresponding author

Correspondence to K. Nishio.

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R. Krücken

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Nishio, K., Hofmann, S., Heßberger, F.P. et al. Measurement of evaporation residue cross-sections of the reaction 30Si + 238U at subbarrier energies. Eur. Phys. J. A 29, 281–287 (2006). https://doi.org/10.1140/epja/i2006-10091-y

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  • DOI: https://doi.org/10.1140/epja/i2006-10091-y

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