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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.17: Poster

Monday, March 7, 2005, 16:30–18:00, TU MA141

ANGULAR CORRELATIONS OF THE DECAY CHANNELS OF ⁵⁶Ni^* FORMED IN THE ²⁴Mg + ³²S REACTION — •G. Efimov^1,2,3, W. von Oertzen^1,2, G. Gebauer², S. Thummerer², Tz. Kokalova^1,2, C. Wheldon¹, Ch. Schulz², H.G. Bohlen², D.R. Napoli⁴, S.M. Lenzi⁵, C. Beck⁶, M. Rousseau⁶, P. Papka⁶, and D. Kamanin³ — ¹Freie Universität, Berlin, Germany — ²SF7, Hahn-Meitner-Institut Berlin, Germany — ³Joint Institute for Nuclear Research, JINR, Dubna, Russia — ⁴INFN-Laboratori Nazionali di Legnaro, Legnaro, Italy — ⁵Dipartimento di Fisica and INFN, Padova, Italy — ⁶Institut de Recherches Subatomiques, Strasbourg, France

Using the Binary Reaction Spectrometer (BRS) together with the EUROBALL array of Ge detectors the coplanarity of events with two heavy fragments in the decay channels of the reaction ³²S + ²⁴Mg → ⁵⁶Ni at an energy of E_L = 163.5 MeV has been reconstructed. For the correlated detection of two heavy ejectiles, the BRS combines 2 large-area gas detector telescopes in a kinematic coincidence set-up.

Extremely narrow out-of-plane angular correlations are observed not only in the case of binary decays with no charge loss, but also for the events with missing charges of 4 and 6. This observation can be interpreted as due to ternary fission processes, proceeding through elongated shapes of the hyper deformed compound nucleus.