Zeitschrift für Physik A Hadrons and Nuclei

, Volume 350, Issue 4, pp 281–282

The new element 111

Authors

  • S. Hofmann
    • Gesellschaft für Schwerionenforschung
  • V. Ninov
    • Gesellschaft für Schwerionenforschung
  • F. P. Heßberger
    • Gesellschaft für Schwerionenforschung
  • P. Armbruster
    • Gesellschaft für Schwerionenforschung
  • H. Folger
    • Gesellschaft für Schwerionenforschung
  • G. Münzenberg
    • Gesellschaft für Schwerionenforschung
  • H. J. Schött
    • Gesellschaft für Schwerionenforschung
  • A. G. Popeko
    • Flerov Laboratory of Nuclear ReactionsJINR
  • A. V. Yeremin
    • Flerov Laboratory of Nuclear ReactionsJINR
  • A. N. Andreyev
    • Flerov Laboratory of Nuclear ReactionsJINR
  • S. Saro
    • Department of Nuclear PhysicsComenius University
  • R. Janik
    • Department of Nuclear PhysicsComenius University
  • M. Leino
    • Department of PhysicsUniversity of Jyväskylä
Short Note

DOI: 10.1007/BF01291182

Cite this article as:
Hofmann, S., Ninov, V., Heßberger, F.P. et al. Z. Physik A - Hadrons and Nuclei (1995) 350: 281. doi:10.1007/BF01291182

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 (1.7−1.4+3.3) pb and (3.5−2.3+4.6) 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.

PACS

21.10.Dr23.60.+e25.70.−z27.90.+b
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Copyright information

© Springer-Verlag 1995