Advertisement

Zeitschrift für Physik A Atoms and Nuclei

, Volume 303, Issue 2, pp 115–121 | Cite as

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

  • T. Lund
  • D. Hirdes
  • H. Jungclas
  • D. Molzahn
  • P. Vater
  • R. Brandt
  • P. Lemmertz
  • R. Faß
  • H. Wollnik
  • H. Gäggeler
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.

Keywords

Uranium Production Cross Production Cross Section Heavy Nucleus Natural Uranium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Oganessian, Yu.Ts., Bruchertseifer, H., Buklanov, G.V., Chepigin, V.I., Choi Val Sek, Eichler, B., Gavrilov, K.A., Gäggeler, H., Korotkin, Yu.S., Orlova, A.O., Reetz, T., Seidel, W., Ter-Akopian, G.M., Tretyakova, S.B., Zvara, I.: Nucl. Phys. A294, 213 (1978)Google Scholar
  2. 2.
    Illige, J.D., Hulet, E.K., Nitschke, J.M., Dougan, R.J., Lougheed, R.W., Ghiorso, A., Landrum, H.J.: Phys. Lett.78 B, 209 (1978)Google Scholar
  3. 3.
    Hildenbrand, K.D., Freiesleben, H., Pühlhofer, F., Schneider, W.F.W., Bock, R., Harrach, D. v., Specht, H.J.: Phys. Rev. Lett.39, 1065 (1977)Google Scholar
  4. 4.
    Gäggeler, H., Trautmann, N., Brüchle, W., Herrmann, G., Kratz, J.V., Peuser, P., Schädel, M., Tittel, G., Wirth, G., Ahrens, H., Folger, H., Franz, G., Sümmerer, K., Zendel, M.: Phys. Rev. Lett.45, 1824 (1980)Google Scholar
  5. 5.
    Jungclas, H., Hirdes, D., Brandt, R., Lemmertz, P., Georg, E., Wollnik, H.: Phys. Lett.79 B, 58 (1978)Google Scholar
  6. 6.
    Becker, H.-J., Lund, T., Brandt, R.: Radiochim. Acta26, 15 (1979)Google Scholar
  7. 7.
    Aumann, D.C., Faleschini, H., Friedmann, L., Weismann, D.: Phys. Lett.82 B, 361 (1979)Google Scholar
  8. 8.
    Kratz, J.V.: GSI-Report 80-1 (1980), GSI Darmstadt (unpublished)Google Scholar
  9. 9.
    Hulet, E.K., Lougheed, R.W., Wild, J.F., Landrum, J.H., Stevenson, P.C., Ghiorso, A., Nitschke, J.M., Otto, R.J., Morrisey, D.J., Baisden, P.A., Gavin, B.F., Lee, D., Silva, R.J., Fowler, M.M., Seaborg, G.T.: Phys. Rev. Lett.39, 385 (1977)Google Scholar
  10. 10.
    Otto, R.J., Morrisey, D.J., Lee, D., Ghiorso, A., Nitschke, J.M., Seaborg, G.T., Fowler, M.M., Silva, R.J.: J. Inorg. Nucl. Chem.40, 589 (1978)Google Scholar
  11. 11.
    Herrmann, G.: Nature280, 543 (1979)Google Scholar
  12. 12.
    Deubler, H.H., Dietrich, K.: Phys. Lett.62 B, 369 (1976)Google Scholar
  13. 13.
    Deubler, H.H., Lekkas, K., Sperr, P., Dietrich, K.: Z. Phys. A — Atoms and Nuclei284, 237 (1978)Google Scholar
  14. 14.
    Fiset, E.O., Nix, J.R.: Nucl. Phys. A193, 647 (1972)Google Scholar
  15. 15.
    Becker, H.-J., Brandt, R., Jungclas, H., Lund, T., Molzahn, D.: Nucl. Instrum. Methods159, 75 (1979)Google Scholar
  16. 16.
    Pielenz, K.: Diplomarbeit, Technische Hochschule Darmstadt, 1977 (unpublished)Google Scholar
  17. 17.
    Brandt, R., Thompson, S.G., Gatti, R.C., Phillips, L.: Phys. Rev.131, 2617 (1963)Google Scholar
  18. 18.a:
    Georg, E., Faß, R., Lemmertz, P., Wilhelm, H.G., Wollnik, H., Hirdes, D., Jungclas, H., Brandt, R., Schardt, D., Wien, K.: Nucl. Instrum. Methods157, 9 (1978)Google Scholar
  19. 18.b:
    Hirdes, D., et al.: Nucl. Instrum. Methods (to be published)Google Scholar
  20. 19.
    Lemmertz, P., Alquist, L.J., Faß, R., Wollnik, H., Hirdes, D., Jungclas, H., Brandt, R., Schardt, D., Zylicz, J.: Phys. A — Atoms and Nuclei298, 311 (1980)Google Scholar
  21. 20.
    Northcliffe, L.C., Schilling, R.F.: Nucl. Data Tables A7, 233 (1970)Google Scholar
  22. 21.
    de Jager, C.W., de Vries, H., de Vries, C.: At. Data Nucl. Data Tables14, 479 (1974)Google Scholar
  23. 22.
    Schröder, W.U., Birkelund, J.R., Huizenga, J.R., Wolf, K.L., Unik, J.P., Viola, V.E., Jr.: Phys. Rev. Lett.36, 514 (1976)Google Scholar
  24. 23.
    Stender, E., Trautmann, N., Herrmann, G.: Radiochem. Radioanalyt. Lett.42, 291 (1980)Google Scholar
  25. 24.
    Lemmertz, P.: Dissertation, Justus-Liebig-Universität, Gießen, 1981 (unpublished)Google Scholar
  26. 25.
    Gäggeler, H., Brüchle, W., Herrmann, G., Kratz, J.V., Schädel, M., Sümmerer, K., Weber, W., Wirth, G.: Nucl. Instrum. Methods (in press)Google Scholar
  27. 26.
    Weber, W., Schimpf, E., Gäggeler, H., Herrmann, G.: Annual Report 1978, GSI 79-11, p. 184 (1979), GSI Darmstadt (unpublished)Google Scholar
  28. 27.
    Sperr, P., Wagner, W., Essel, H., Hartel, K., Hennig, W., Kienle, P., Körner, H.J., Rehm, K.E., Weber, J.: Z. Phys. A — Atoms and Nuclei287, 57 (1978)Google Scholar
  29. 28.a
    Wolf, K.L., Unik, J.P., Horwitz, E.P., Blomquist, C.A.A., Delphin, W.: Bull. Am. Phys. Soc.22, 67 (1977)Google Scholar
  30. 28.b
    Wolf, K.L.: Private communication 1978Google Scholar
  31. 29.a
    Schädel, M., Kratz, J.V., Ahrens, H., Brüchle, W., Franz, G., Gäggeler, H., Warnecke, I., Wirth, G., Herrmann, G., Trautmann, N., Weis, M.: Phys. Rev. Lett.41, 469 (1978)Google Scholar
  32. 29.b
    Schädel, M.: GSI-Report 79-8 (1979), GSI Darmstadt (unpublished)Google Scholar

Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • T. Lund
    • 1
  • D. Hirdes
    • 1
  • H. Jungclas
    • 1
  • D. Molzahn
    • 1
  • P. Vater
    • 1
  • R. Brandt
    • 1
  • P. Lemmertz
    • 2
  • R. Faß
    • 2
  • H. Wollnik
    • 2
  • H. Gäggeler
    • 3
  1. 1.Kernchemie, FB 14Philipps-UniversitätMarburgGermany
  2. 2.II. Physikalisches InstitutJustus-Liebig-UniversitätGiessenGermany
  3. 3.Gesellschaft für SchwerionenforschungDarmstadtGermany

Personalised recommendations