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Phys. Rev. C 79, 024608 (2009) - Attempt to produce the isotopes of element 108 in the fusion reaction $^{136}\mathrm{Xe}+^{136}\mathrm{Xe}$

Attempt to produce the isotopes of element 108 in the fusion reaction Xe 136 + Xe 136

Yu. Ts. Oganessian, S. N. Dmitriev, A. V. Yeremin, N. V. Aksenov, G. A. Bozhikov, V. I. Chepigin, M. L. Chelnokov, V. Ya. Lebedev, O. N. Malyshev, O. V. Petrushkin, S. V. Shishkin, A. I. Svirikhin, E. E. Tereshatov, and G. K. Vostokin
Phys. Rev. C 79 , 024608 ? Published 13 February 2009
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Abstract

A setup of the experiment on the production of the isotopes with Z = 108 in the fusion reaction Xe 136 + Xe 136 and the obtained results are presented. At the excitation energy 0 ? E x ? 30 MeV of the Hs 272 * compound nucleus the upper limit of the cross section for evaporation residues σ ( 1 ? 3 ) n ? 4 pb has been measured. The experimental results together with the data from asymmetric reactions point to a strong limitation of the Hs compound nucleus formation with increasing Coulomb forces in the entrance channel of the reaction.

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  • Received 28 November 2008

DOI: https://doi.org/10.1103/PhysRevC.79.024608

ⓒ2009 American Physical Society

Authors & Affiliations

Yu. Ts. Oganessian , S. N. Dmitriev , A. V. Yeremin , N. V. Aksenov , G. A. Bozhikov , V. I. Chepigin , M. L. Chelnokov , V. Ya. Lebedev , O. N. Malyshev , O. V. Petrushkin , S. V. Shishkin , A. I. Svirikhin , E. E. Tereshatov , and G. K. Vostokin

  • Flerov Laboratory of Nuclear Reactions, JINR, RU-141980 Dubna, Moscow region, Russia

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Vol. 79, Iss. 2 ? February 2009

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  • Figure 1
    Figure 1
    The cross sections of xn -channels in the reaction Xe 136 + Xe 136 as a function of the excitation energy of the Hs 272 compound nucleus: solid lines?results of calculations within the diffusion model of the fusion process [ 18 ], the dotted line?data from work [ 20 ], with a variation of calculation parameters. Reuse & Permissions
  • Figure 2
    Figure 2
    Schematic view of the setup employed for the synthesis of element 108 isotopes in the fusion reaction Xe 136 + Xe 136 . Reuse & Permissions
  • Figure 3
    Figure 3
    Alpha-particle energy spectra from the decay of Os isotopes (shown in the figure) observed in the reaction Ne 20 + Dy 156 → Os 176 * at the Ne 20 ion beam energy E L = 170 MeV. Reuse & Permissions
  • Figure 4
    Figure 4
    Energy spectra of α -particles registered by eight detectors ( T = ? 50 ° C ) in the reaction Xe 136 + Xe 136 during the whole experiment. Reuse & Permissions
  • Figure 5
    Figure 5
    The spectrum of α -particles from the reaction Xe 136 + Xe 136 registered during 3 h by eight detectors at a temperature of ? 50 ° C . The spectrum of α -particles (filled area) registered by the same detectors at room temperature is shown for comparison. Reuse & Permissions
  • Figure 6
    Figure 6
    Fusion probability leading to the formation of the compound nucleus Z = 108 . Filled squares represent calculated values obtained from experimental evaporation residue cross sections of the reactions Mg 26 + Cm 248 [ 21 ], Fe 58 + Pb 208 [ 23 ], and Xe 136 + Xe 136 (this work). The open square shows predictions for the reaction Ca 48 + Ra 226 [ 24 ]. Explanations for the solid and dotted curves are in the text. Reuse & Permissions
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