摘要: 本文简要评述了中能重离子碰撞中可能存在的奇异密度分布形状──气泡核和环形核的形成，并论述了实验观测方面的可能特征． Possible existence of the exotic density shapes-the formation of nuclear bubbles and rings-in the domain of intermediate energy heavy ion collisions have been briefly reviewed. Some experimental consequences were dicussed.