Conditions of Fragment Formation in Central and Peripheral Collisions

Authors: W.F.J. Müller for the ALADIN collaboration
Published: Proceedings of the 27th International Workshop on the Gross Properties of Nuclei and Nuclear Excitations, Hirschegg, Austria, January 17 - January 23, 1999
    edited by H. Feldmeier, J. Knoll, W. Nörenberg, J. Wambach, p. 200
Abstract: We report on new measurements of the breakup temperature determined from isotope ratios as well as from state population ratios for the decay of the spectator in Au + Au collisions at 600 and 1000 A MeV and compare them to results for the decay of the participant region at beam energies of 50 - 200 A MeV. Temperatures deduced from the new isotope thermometer TBeLi exhibit a pronounced rise with increasing excitation energy and are consistent with the previously studied THeLi. In contrast, temperatures determined from state population ratios show no dependence on excitation energy. An improved calorimetric determination of the excitation energy for the spectator shows a significant increase with increasing bombarding energy which is in contrast to the observed universality of the fragment production.
Paper: Postscript 10 pages with 10 embedded figures
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Figures: Fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
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