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中文摘要：
该工作提出了一个同位旋依赖碎块判断方法用以描述重离子碰撞过程中的碎块形成。利用该方法可以改善输运理论对于核子以及轻带电粒子产额的描写，其在计算中降低了发射核子产额、增加碎块（特别是丰中子碎块）的产额。对于丰中子轻带电粒子的增强主要出现在中心快度区。研究表明，该方法对于同位旋敏感的观测量，如n/p,1/3He,Rmid yield和isoscaling parameters等，以及系统的平衡度的量度都会产生影响。
英文摘要：
We introduce isospin dependence in the cluster recognition algorithms used in the Quantum Mole- cular Dynamics model to describe fragment formation in heavy ion collisions. This change reduces the yields of emitted nucleons and enhances the yields of fragments, especially for heavier fragments. The enhancement of neutron-rich lighter fragments mainly occurs at mid-rapidity. Consequently, isospin dependent observables,such as isotope distributions, yield ratios of n/p,1/3He,Rmid yield and isoscaling parameters are affected. We alsoinvestigate how equilibration in heavy ion collisions is affected by this change.
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