Production and decay of269110 (original) (raw)

Abstract

In an experiment carried out to identify element 110, we have observed an_α_-decay chain, that can be unambiguously assigned to269110. In a scries of preexperiments the excitation functions of the fusion reactions50Ti +208Pb→258104* and58Fe +208Pb→266108* were measured with high precision in order to get the optimum projectile energies for the production of these heavy elements. The cross-section maxima of the 1n evaporation channels were observed at excitation energies of 15.6 MeV and 13.4 MeV, respectively. These data result in an optimum excitation energy of 12.3 MeV of the compound nucleus for the production of269110 in the reaction62Ni +208Pb→269110 + 1n. In irradiations at the corresponding beam energy of 311 MeV we have observed a decay chain of 4 subsequent a decays. This can be assigned to the isotope with the mass number 269 of the element 110 on the basis of delayed α-α coincidences. The accurately measured decay data of the daughter isotopes of the elements 108 to 102, obtained in the previous experiments, were used. The isotope269110 decays with a hair-life of (270 +1300-120 ) μs by emission of (11.132±0.020) MeV alpha particles. The production cross-section is (3.3 +6.2-2.7 ) pb.

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Authors and Affiliations

  1. Gesellschaft für Schwerionenforschung, D-64220, Darmstadt, Germany
    S. Hofmann, V. Ninov, F. P. Heßberger, P. Armbruster, H. Folger, G. Münzenberg & H. J. Schött
  2. Flerov Laboratory of Nuclear Reactions, JINR, 141980, Dubna, Russia
    A. G. Popeko, A. V. Yeremin & A. N. Andreyev
  3. Department of Nuclear Physics, Comenius University, SK-84215, Bratislava, Slovakia
    S. Saro & R. Janik
  4. Department of Physics, University of Jyväskylä, SF-40100, Jyväskylä, Finland
    M. Leino

Authors

  1. S. Hofmann
  2. V. Ninov
  3. F. P. Heßberger
  4. P. Armbruster
  5. H. Folger
  6. G. Münzenberg
  7. H. J. Schött
  8. A. G. Popeko
  9. A. V. Yeremin
  10. A. N. Andreyev
  11. S. Saro
  12. R. Janik
  13. M. Leino

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Hofmann, S., Ninov, V., Heßberger, F.P. et al. Production and decay of269110.Z. Physik A - Hadrons and Nuclei 350, 277–280 (1995). https://doi.org/10.1007/BF01291181

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