Köln 2004 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 33: Heavy Ions III
HK 33.6: Talk
Wednesday, March 10, 2004, 15:45–16:00, E
Investigation of N/Z of the heavy fragmentation products - the isospin thermometer method — •D. Henzlova1, M.V. Ricciardi1, J. Benlliure2, A.S. Botvina1, T. Enqvist1, A. Kelic1, P. Napolitani1, J. Pereira2, and K.-H. Schmidt1 — 1GSI-Darmstadt, Germany — 2Uni. Santiago de Compostela, Spain
Investigations of the isotopic distributions of the fragmentation residues received an extensive interest in the past decades as they provide a deeper insight into the properties of nuclear matter. Their previous studies were limited to rather light fragments due to the low experimental mass resolution achieved and since the theoretical interpretations of heavy fragments are complicated by the stronger influence of the evaporation process. The isotopic distributions and mean N/Z ratios of the heavy fragments, measured in series of experiments on the high-resolution magnetic spectrometer (FRS) at GSI, Darmstadt, including the results of a recent experiment for the system 136Xe+Pb at 1AGeV will be presented. The deviation of the final mean N/Z from the universal evaporation corridor, observed for the neutron-rich fragmenting system, is confirmed in this dedicated experiment. The data are investigated with the use of the isospin-thermometer method in order to extract the freeze-out temperature after the break-up stage from the reduction of the N/Z in the evaporation process.