中能重离子反应中“neck”的形成和碎裂  

"Neck" formation and Fragmentation in Intermediate EnergyHeavy -Lon Collisions

作　　者：陈列文[1] 葛凌霄[1] 张丰收[1] 

机构地区：[1]中国科学院近代物理研究所

出　　处：《高能物理与核物理》1997年第11期1018-1023,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金;中国科学院LWTZ-1298经费资助

摘　　要：在不同碰撞参数下，应用量子分子动力学模型对３０ＭｅＶ／ｕ４０Ｃａ＋４０Ｃａ碰撞系统进行了计算，观察到周边碰撞ｂ＝６ｆｍ时碰撞系统产生的中等质量碎片最多，发现这是由于碰撞过程中“ｎｅｃｋ”碎裂造成的，同时还发现“ｎｅｃｋ”结构形成过程中碰撞系统相对密度涨落增长较慢，饱和值较小，体现了形状不稳定性的特征。Under different impact parameters, the collision system of 30MeV/u 40 Ca +40 Ca is investigated in terms of QltllD model. It is .shown that the number of IMFs is the largest at impact pararneter b=6fm, which is due to the formation of 'neck' in collision process. Meanwhile, it is found the. in the process of fonmadon of 'neck', the growth of the relative density fluctuation of the reaction system is very slow and the saturation value is small, which imply the character of shape instability.

关 键 词：重离子反应 中等质量碎片 碰撞系统 neck碎裂 

分 类 号：O571.426[理学—粒子物理与原子核物理]