20～46.2MeV/u ^(12)C+^(64)Cu反应中线性动量转移及重余核质量产额分布研究

Study of Linear Momentum Transfer and Mass Distribution of Residues in Collisions of ^(12)C with ^(Nat.)Cu at 20～46. 2MeV/u

利用核化学方法测量了20～46.2MeV/u^(12)C与铜靶核碰撞中重余核产物的平均反冲射程及余核产额,从而得到了该系统的线性动量转移及重余核质量产额分布随入射能量的变化,讨论了线性动量转移与靶核几何尺寸及系统尺寸的关系,利用两体衰变理论对重余核质量产额分布进行了分析,并认为在这个能区,该碰撞系统所形成的激发核的主要衰变模式是相继两体衰变。

The linear momentum transfer (LMT) and mass distribution of the residues in thecollisions of ^(12)C with ^(Nat)Cu in energy region of 20～46. 2MeV/u were measured by usingrediochemical method. Comparing the LMT in this system with that in other systems, linear dependenceof the maxium LMT for central collision on geometry of target nucleus was obtained, and the averageLMT then depended on the geometry of whole system. Comparision of the mass distribution measured here with theoretical calculation indicated that theexcited nuclei formed in the collisions at this energy region tended to sequentical binary decay.