Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Structure/Spectroscopy

HK 10.19: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

BINARY AND NON-BINARY DECAY CHANNELS OF COMPOUND NUCLEI FORMED IN ²⁴Mg + ³²S and ²⁴Mg + ³⁶Ar REACTIONS — •G. Efimov^1,2, S. Thummerer², G. Gebauer², W. von Oertzen^1,2, Ch. Schulz², H.G. Bohlen², Tz. Kokalova^1,2, D.R. Napoli³, S.M. Lenzi⁴, C. Ur⁴, C. Beck⁵, M. Rousseau⁵, P. Papka⁵, and D. Kamanin⁶ — ¹Freie Universität Berlin, Germany — ²Hahn-Meitner-Institut Berlin, Germany — ³INFN-Laboratori Nazionali di Legnaro, Legnaro, Italy — ⁴Dipartimento di Fisica and INFN, Padova, Italy — ⁵Institut de Recherches Subatomiques, IreS, Strasbourg, France — ⁶Joint Institute for Nuclear Research, JINR, Dubna, Russia

Measurements have been performed in Strasbourg using the Binary Reaction Spectrometer (BRS) together with the EUROBALL array of germanium detectors. This combination enabled particle-γ coincidences to be measured and the kinematics of the reaction to be fully reconstructed. The angular correlations in the binary and non-binary decay channels of the reactions ³²S + ²⁴Mg → ⁵⁶Ni at an energy of E_L = 163.5 MeV and ³⁶Ar + ²⁴Mg → ⁶⁰Zn at an energy of E_L = 195 MeV have been studied. In the case of no missing charge, the reactions are coplanar except for a small contribution due to neutron evaporation. The out-of-plane correction is broader for ΔZ=2 and a narrow component unexpectedly dominates for ΔZ=4. This observation can be interpreted as due to extreme deformations of the compound (even-even) nuclei. In order to interpret the results an Extended-Hauser-Feshbach approach is applied.