Binary fission and coplanar cluster decay of 60Zn compound nuclei at high angular momentum

V. Zherebchevsky, W. von Oertzen, D. Kamanin, B. Gebauer, S. Thummerer, Ch Schulz, G. Royer

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Fission decays with two heavy fragments in coincidence have been measured from 60Ni compound nuclei, formed in the 36Ar + 24Mg reaction at Elab (36Ar) = 195   MeV (5.4 MeV/A). The experiment was performed with a unique kinematic coincidence set-up consisting of two large area position sensitive (x, y) gas detector telescopes with Bragg-ionisation chambers. Very narrow out-of-plane correlations are observed for two heavy fragments emitted in either purely binary events or in events with a missing mass consisting of 2, 3 and 4 α-particles. The broad out-of-plane distributions correspond to binary fission with the evaporation of α-particles or nucleons from excited fragments. The narrow correlations are interpreted as ternary coplanar cluster decay from compound nuclei at high angular momenta through elongated shapes with large moments of inertia, and the lighter mass remains with very low momentum in the centre of mass frame. It is shown in calculations of shapes, that the large moments of inertia of the hyper-deformed configurations expected in these nuclei, will lower the ternary fission barrier so as to make a competition with binary fission possible.

Original languageEnglish
Pages (from-to)12-18
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume646
Issue number1
DOIs
StatePublished - 1 Mar 2007

Scopus subject areas

  • Nuclear and High Energy Physics

Keywords

  • Ar +Mg, E = 195   MeV
  • Binary and ternary fission channels
  • Fission
  • Heavy ion reactions
  • Kinematic coincidences for heavy fragments
  • Out-of-plane correlations

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