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The recent fragmentation data for central collisions of Gold on Gold are evenqualitatively different from those for central collisions of Argon on Scandium.The latter can be fitted with a lattice gas model calculation. Effort is madeto understand why the model fails for Gold on Gold. The calculation suggeststhat the large Coulomb interaction which is operative for the larger system isresponsible for this discrepancy. This is demonstrated by mapping the latticegas model to a molecular dynamics calculation for disassembly. This mapping isquite faithful for Argon on Scandium but deviates strongly for Gold on Gold.The molecular dynamics calculation for disassembly reproduces thecharacteristics of the fragmentation data for both Gold on Gold and Argon onScandium.Comment: 13 pages, Revtex, 8 figures in ps files, submitted to Phys. Rev.

Lattice gas model for fragmentation: From argon on scandium to gold on gold