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Zeitschrift für Physik A Atoms and Nuclei

, Volume 322, Issue 2, pp 227–235 | Cite as

The isotopes259106,260106, and261106

  • G. Münzenberg
  • S. Hofmann
  • H. Folger
  • F. P. Heßberger
  • J. Keller
  • K. Poppensieker
  • B. Quint
  • W. Reisdorf
  • K. H. Schmidt
  • H. J. Schött
  • P. Armbruster
  • M. E. Leino
  • R. Hingmann
Nuclei

Abstract

In irradiations of207Pb and208Pb, respectively, with54Cr theα-decay of the isotopes259106,260106, and261106 could be observed for the first time. For260106 a spontaneous fission branch of (50 −20 +30 )% was observed. The isotopes were identified by genetic relationships of α-decay after separation in-flight with the velocity filter SHIP and implantation into a position-sensitive silicon surface-barrier detector.

The measured partial fission halflife of the doubly even isotope260106 of (7.2 −2.7 +4.8 )ms exceeds the predicted values by at least a factor of 40. This result could be explained by the high shell corrections of the ground state mass, derived from the measured α-decay energies. The experimental results show evidence for an island of purely shell stabilized nuclei in the region of deformed isotopes beyond the actinides.

PACS

23.60.+ e 25.85.Ca 25.70.Jj 

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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • G. Münzenberg
    • 1
  • S. Hofmann
    • 1
  • H. Folger
    • 1
  • F. P. Heßberger
    • 1
  • J. Keller
    • 1
  • K. Poppensieker
    • 1
  • B. Quint
    • 1
  • W. Reisdorf
    • 1
  • K. H. Schmidt
    • 1
  • H. J. Schött
    • 1
  • P. Armbruster
    • 1
  • M. E. Leino
    • 2
  • R. Hingmann
    • 3
  1. 1.Gesellschaft für SchwerionenforschungDarmstadtGermany
  2. 2.Department of PhysicsUniversity of HelsinkiHelsinkiFinland
  3. 3.II. Physikalisches Institut der Universität GiessenGermany

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