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  von Oertzen, W.; Zherebchevsky, V.; Efimov, G.; Gebauer, B.; Thummerer, S.; Kokalova, Tz.; Schulz, Ch.; Bohlen, H.G.; Kamanin, D.; Beck, C.; Curien, D.; Rousseau, M.; Papka, P.; Royer, G.; de Angelis, G.: Coplanar ternary cluster decay of hyper-deformed ⁵⁶Ni and ⁶⁰Zn at high angular momentum. Journal of Physics: Conference Series 111 (2008), p. 012051/1-6

10.1088/1742-6596/111/1/012051

Abstract:
Using a unique two-arm detector system for heavy ions (BRS, binary reaction spectrometer) coincident fission events have been measured from the decay of ⁶⁰Zn and ⁵⁶Ni compound nuclei formed at 83-88 MeV excitation energy. From the binary coincidences inclusive and exclusive cross sections for fission channels with different losses of charge were obtained. Narrow out-of-plane correlations corresponding to coplanar decay are observed for two fragments emitted in binary events, and in the data for ternary decay with missing charges from 4 up to 8. Differential cross sections for the different binary and ternary fission channels are obtained. The ternary cluster fission can be explained by the statistical decay from equilibrated compound nuclei with hyper-deformed shapes with angular momenta around 45-52 \hbar.