Incomplete-fusion-fragmentation model and nuclear liquid-gas phase transition

The incomplete-fusion-fragmentation model is used to analyze the fragmentation of the projectile remnant in the 600 MeV/u Au + Au reaction. The theoretical results of the mass number, the excitation energy, and the thermodynamic temperature of the projectile remnant agree well with experimental data. The backbending structure in the curve of temperature as a function of the excitation energy per nucleon, i.e., the evidence of liquid-gas phase transition, is reproduced and related to the decay mode transformation from the dominance of the multifragmentation mode to the vaporization mode.