以发射大量中等质量碎块为主要特征的多重碎裂是中能重离子碰撞的主要反应道之一.中能核?核碰撞将很大的相对运动动能转化为核物质的内部激发能和压缩能,形成热密核.在热密核膨胀和冷却过程中;出现很大的密度涨落,出现汽???液共存状态,形成了碎块.这些初始核碎块在库仑力作用下彼此分开,经退激发演化成有多个碎块的末态“,”The Characteristic pattern of nuclear multifragmentation is the production of several three or more intermediate mass fragments(IMF)with a charge between 3 to 30. Multifragmentation is described as a proper phase-transition of hot dense nuclear matter with a rapid rise of the entropy, at the onset of chaotic, highly dissipative expansion where mean field fluctuation is very important. Yields of the multifragmentation are simulated within the frame of quantam molecular dynamics(QMD).