CALORIC CURVE IN FRAGMENTATION

We study phase transitions of small two-dimensional Lennard-Jones drop s via microcanonical molecular dynamics in a broad energy range. We fo und that the caloric curve can be extended to high energies to compreh end high evaporation rates and highly nonequilibrium phenomena such as multifragmentation. Multifragmentation appears as a constant temperat ure region in the caloric curve like the solid-liquid phase transition .