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The isotopes259106,260106, and261106

  • Nuclei
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Zeitschrift für Physik A Atoms and 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 +30−20 )% 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 +4.8−2.7 )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.

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Authors and Affiliations

  1. Gesellschaft für Schwerionenforschung, Darmstadt, Germany

    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

  2. Department of Physics, University of Helsinki, Helsinki, Finland

    M. E. Leino

  3. II. Physikalisches Institut der Universität Giessen, Germany

    R. Hingmann

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  1. G. Münzenberg
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Münzenberg, G., Hofmann, S., Folger, H. et al. The isotopes259106,260106, and261106. Z Physik A 322, 227–235 (1985). https://doi.org/10.1007/BF01411887

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