Statistical fragmentation of Au projectiles at E/A = 600 MeV

Authors: J. Hubele, P. Kreutz, V. Lindenstruth, J.C. Adloff, M. Begemann-Blaich, P. Bouissou, G. Imme, I. Iori, G.J. Kunde, S. Leray, Z. Liu, U. Lynen, R. J. Meijer, U. Milkau, A. Moroni, W.F.J. Müller, C. Ngo, C.A. Ogilvie, J. Pochodzalla, G. Raciti, G. Rudolf, H. Sann, A. Schüttauf, W. Seidel, L. Stuttge, W. Trautmann, A. Tucholski, R. Heck, A.R. DeAngelis, D.H.E. Gross, H.R. Jaqaman, H.W. Barz, H. Schulz, W.A. Friedman, and R.J. Charity
Published: Phys.Rev. C48 (1992) R1577 [->Spires]
Preprint GSI-92-17, March 1992
Abstract: The mean multiplicity of intermediate mass fragments (IMF) <MIMF> produced by fragmentation of Au projectiles interacting with targets of C, Al, Cu, and Pb at an incident energy of E/A=600 MeV is compared to predictions of statistical multifragmentation and sequential evaporation models. The initial conditions for the calculations were provided by Boltzmann-Uehling-Uhlenbeck simulations. In the high excitation energy regime where the IMF multiplicity reaches its maximum the observed universal correlation between <MIMF> and the total charge Zbound of projectile fragments with charges Z >= 2 cannot be reproduced by a sequential evaporation code. In this regime the data are better described by statistical decay calculations which assume the formation of an expanded nuclear system and a rather fast breakup.

PACS numbers: 24.60.Ky, 25.40.Sc, 25.70.Pq

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