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Observation of proximity- and non-equilibrium effects in ternary heavy ion reactions

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

Kinematically complete experiments have been performed on the two- and three-body exit channels in the reactions84Kr+166Er and129Xe+122Sn at 12.5 MeV/u. Three-body events occur with an unusually high probability. They arise from a fast two-step mechanism where a sequential fission-like process follows a deep inelastic collision with preferentially very large energy losses. Strong Coulomb proximity effects are observed in the three-body final state which, treated quantitatively in Coulomb trajectory calculations, establish a time-scale of 1·10−21 s between the consecutive scission acts. The angular distribution of fission fragments is consistent with an orientation of the fission axis approximately collinear with the axis of the first scission, and the mass distribution of the fission is asymmetric with the heavier mass emitted preferentially opposite to the direction of the third particle. The high fission probability, the short time-scale, the near collinear orientation and the fission mass asymmetry together present consistent evidence for a new phenomenon of non-equilibrium fission.

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Authors and Affiliations

  1. Physikalisches Institut der Universität Heidelberg, Federal Republic of Germany

    P. Glässel, D. v. Harrach & H. J. Specht

  2. Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

    L. Grodzins

Authors
  1. P. Glässel
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  2. D. v. Harrach
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  3. H. J. Specht
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  4. L. Grodzins
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Additional information

We are grateful to the UNILAC staff for providing the high quality pulsed Kr- and Xe-beams, and to the SATAN-group at GSI for the excellent soft-ware support. One of us (L.G.) acknowledges a Humboldt-fellowship and partial support from the US Department of Energy.

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Glässel, P., v. Harrach, D., Specht, H.J. et al. Observation of proximity- and non-equilibrium effects in ternary heavy ion reactions. Z Physik A 310, 189–216 (1983). https://doi.org/10.1007/BF01415224

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  • DOI: https://doi.org/10.1007/BF01415224

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