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HK: Physik der Hadronen und Kerne
HK 12: Physik mit schweren Ionen III / Kernphysik
HK 12.5: Talk
Monday, March 20, 2000, 17:45–18:00, B 98
Projectile Fragmentation at relativistic energies: A possibility to determine the viscosity of nuclear matter — •Beatriz Jurado1, Karl-Heinz Schmidt1, Fanny Farget1, Timo Enqvist1, Frederic Ameil1, Peter Armbruster1, Jose Benlliure2, Monique Bernas3, Brahim Mustapha3, Laurent Tassan-Got3, Claude Stephan3, Alain Boudard4, Sylvie Leray4, Robert Legrain4, Claude Volant4, Serge Czajkowsky5, and Michel Pravikoff5 — 1GSI Darmstadt, Germany — 2University of Santiago de Compostela, Spain — 3IPN Orsay, France — 4CEA Saclay, France — 5CEN Bordeaux-Gradignon, France
Up to now, the results on nuclear viscosity are rather contradictory. Values of the dissipation coefficient between β≈0.5·1021s−1 and β≈20·1021s−1 have been deduced from previous experiments. A new experimental access to the dynamics of fission is given by peripheral nuclear collisions at relativistic energies where different nuclei with a broad range of excitation energies and low angular momenta are produced. The deexcitation process of the heaviest nuclei is a competition between neutron emission and fission. Our experimental setup at GSI allows determining the fission cross sections as a function of the nuclear charges of both fission fragments. We will show that these data are sensitive to the viscosity.