Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 38: Kernphysik/Spektroskopie
HK 38.2: Vortrag
Mittwoch, 9. März 2005, 14:30–14:45, TU MA004
Ternary Fission from Hyper-deformed States in A=56-60 — •W. von Oertzen1,2, G. Efimov1,3,2, V. Zherebchevsky1,2, D. Kamanin1,3, B. Gebauer1, S. Thummerrer1, Tz. Kokalova1, H.G. Bohlen1, C. Schulz1, C. Beck4, M. Rousseau4, P. Papka4, G. Royer5, G. de Angelis6, and C. Wheldon 1 — 1Hahn Meitner Institut D14109 Berlin, Glienickerstr.100 — 2Freie Universität, Berlin — 3FLNR, JINR-DUBNA, Russia — 4IreS, Strasbourg, France — 5Subatech, Nantes, France — 6LNL, Legnaro, Padova, Italy
With a unique charged particle detector set-up for the registration of binary coincidences (BRS, Binary Reaction Spectrometer) we have studied two systems, 36Ar+24Mg, and 32S+24Mg at energies of 195 and 163 MeV, respectively. The BRS measures the reaction angles in and out of plane and gives through Bragg-peak and range spectroscopy a complete coverage of the total charge in the final channels. The yields of the binary and the non-binary (ternary) channels with missing mass up to A=16 are determined. We observe very narrow out-of-plane angular correlations for binary reactions but also for those ternary events, where the third missing charge is a multiple of α-particles. The result is explained by a ternary fission decay at high angular momentum from hyper-deformed shapes. From the energetics of the reaction and from the relative yields of the ternary fission events the formation of highly excited hyper-deformed nuclei 56Ni and 60Zn can be uniquely deduced, as described by the α-cluster model in ref.1, or by the Nilsson-Strutinsky method. 1)J. Zhang, A.C. Merchant and W.D.M. Rae, Phys.Rev. C49(1994) 562.