30MeV/u^(40)Ar+^(159)Tb反应中前角区复杂碎片的来源

Origins of the Forward Emission of Complex Fragments for 40Ar+159Tb Reaction at 30MeV/u

在前角测量了３０ＭｅＶ／ｕ４０Ａｒ＋１５９Ｔｂ反应中两裂片符合下的轻粒子和复杂碎片，利用线性动量转移和总横向动量方法对三体符合事件进行了碰撞参数分类。实验结果表明，在中心碰撞中复杂碎片主要来自于平衡类靶核的统计发射，并伴随有非平衡中途成份；而周边碰撞中前角区复杂碎片主要来自于弹核碎裂成份。在半中心碰撞中则存在类弹、类靶和中途三种成份。

Light charged particles and complex fragments have been measured at forward angles in coincidence with two fission fragments for 40Ar +159Tb reaction at 25MeV / u. These three - body coincident events were sorted as a function of the impact parameter using linear momentum transfer and total transverse momenta methods. Equilibrium statistical emissions of complex fragments from quasi - target residues accompanied by non - equilibrium mid - rapidity components were found to dominate in central collisions, while projectile fragmentations were found to dominate in peripheral collision. Three components of complex - fragments from quasi - target, quasi - projectile and mid - rapidity soures were found in mid - central collision.