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Coplanar Ternary Cluster Decay of Hyper-deformed $^{56}$Ni
G. Efimov, V. Zherebchevsky, W. von Oertzen, B. Gebauer, S. Thummerer, Tz. Kokalova, Ch. Schulz, H.G. Bohlen, D. Kamanin, C. Beck1, D. Curien1, M. Rousseau1, P. Papka1, G. Royer2, G. De Angelis
(2007)

Coincidences between two heavy fragments have been measured from fission of 56Ni compound nuclei, formed in the 32S + 24Mg reaction at Elab(32S) = 163.5 MeV. A unique experimental set-up consisting of two large area position sensitive (x, y) gas-detector telescopes has been used allowing the complete determination of the observed fragments, and their momentum vectors. In addition to binary fission events with subsequent particle evaporation, narrow out-of-plane correlations are observed for two fragments emitted in purely binary events and in events with a missing mass consisting of 2$\alpha$ and 3$\alpha$ particles(12C). These events are interpreted as ternary cluster decay from 56Ni-nuclei at high angular momenta through hyper-deformed shapes
1 :  DRS-IPHC - Département Recherches Subatomiques
2 :  SUBATECH - Laboratoire SUBATECH Nantes
Physique/Physique Nucléaire Expérimentale
NUCLEAR REACTIONS – 24Mg+32S – Elab=163.5 MeV – Kinematic coincidences for heavy fragments – out-of-plane correlations – binary and ternary fission channels
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