The new element 111

Abstract

The new element 111 was produced and unambiguously identified in an experiment at SHIP, GSI Darmstadt. Three nuclei of the isotope272111 were observed in irradiations of209Bi targets with64Ni projectiles of 318 MeV and 320 MeV energy. The cross-sections are (1.7 +3.3−1.4 ) pb and (3.5 +4.6−2.3 ) pb, respectively. The nuclei decay by a emission into the new and so far the heaviest isotopes of the elements 109 and 107 with mass numbers A=268 and A=264. Theα-decay chains were followed down to the known nuclei260105 and256Lr.

This is a preview of subscription content, log in to check access.

References

  1. 1.

    S. Hofmann et al., to be published in Z. Phys. A, 1994

  2. 2.

    S. Hofmann et al., GSI Nachrichten 11-94, Nov. 1994 and to be published

  3. 3.

    P. Armbruster, Ann. Rev. Nucl. Part. Sci. 35, 135, 1985

    Google Scholar 

  4. 4.

    G. Münzenberg et al., Z. Phys. A322, 227, 1985

    Google Scholar 

  5. 5.

    A. Sobiczewski, Physics of Particles and Nuclei, 25, 295, 1993 and private communications

    Google Scholar 

  6. 6.

    S. Cwiok et al., Nucl. Phys. A573, 356, 1994

    Google Scholar 

  7. 7.

    P. Möller and R. Nix, J. Phys., G20, 1681, 1994

    Google Scholar 

  8. 8.

    Yu.A. Lazarev et al., Phys. Rev. Lett. 73, 624, 1994

    Google Scholar 

  9. 9.

    Yu.Ts. Oganessian, CERN Courier, Nov. 1994, p. 16

  10. 10.

    A. Ghiorso et al., Phys. Rev. Lett. 24, 1498, 1970

    Google Scholar 

  11. 11.

    C.E. Bemis et al., Phys. Rev. C16, 1146, 1977

    Google Scholar 

  12. 12.

    M.R. Schmorak, Nucl. Data Sheets 57, 515, 1989

    Google Scholar 

  13. 13.

    S. Liran and N. Zeldes, Atomic Data and Nuclear Data Tables 17, 431, 1976

    Google Scholar 

  14. 14.

    A. Ghiorso et al., Phys. Rev. C4, 1850, 1971

    Google Scholar 

  15. 15.

    B. Fricke, private communication, 1994

Download references

Author information

Affiliations

Authors

Additional information

We thank the UNILAC staff and the ion-source group for providing an intense and stable beam of64Ni.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Hofmann, S., Ninov, V., Heßberger, F.P. et al. The new element 111. Z. Physik A - Hadrons and Nuclei 350, 281–282 (1995). https://doi.org/10.1007/BF01291182

Download citation

PACS

  • 21.10.Dr
  • 23.60.+e
  • 25.70.−z
  • 27.90.+b