Lifting the Nuclear Fog

Authors: J. Pochodzalla, M. Begemann-Blaich, Th. Blaich, H. Emling, A. Ferrero, C. Groß, G. Imme, I. Iori, G.J. Kunde, W.D. Kunze, V. Lindenstruth, U. Lynen, T. Möhlenkamp, A. Moroni, W.F.J. Müller, B. Ocker, G. Raciti, T. Rubehn, H. Sann, A. Schüttauf, C. Schwarz, W. Seidel, V. Serfling, J. Stroth, W. Trautmann, A. Trzcinski, A. Tucholski, G. Verde, A. Wörner, B. Zwieglinski, E. Zude
Published: Proceedings of the 8th International Nuclear Physics Conference (INPC 95), 21-26 Aug 1995, Beijing, China
    edited by Z.-X. Sun, et al. World Scientific, Singapore 1996.
Abstract: Recent results of the ALADIN collaboration are reviewed. Fragment multiplicities and correlations are found to be invariant with respect to a change of the target mass or the beam energy when plotted as a function of Zbound. The dependence of the fragment multiplicity on the projectile mass follows a linear scaling law. For Au+Au reactions at E/A=600 MeV, the mass and the excitation energy of the decaying pre-fragments were determined from the measured fragment and neutron distributions. A temperature scale was derived from observed yield ratios of He and Li isotopes. The relation between this isotope temperature and the excitation energy of the system exhibits a behavior which is expected for a phase transition. The nuclear vapor regime takes over at an excitation energy of 10 MeV per nucleon, a temperature of 5 MeV and may be characterized by a density of 0.15-0.3 normal nuclear density.
Paper: Postscript 14 pages with 9 embedded figures
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Figures: Fig. 1, 2, 3, 4, 5, 6, 7, 8, 9
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