重离子熔合反应形成超重核的截面研究

Formation Cross Sections of Super Heavy Nuclei by Heavy Ion Fusion Reactions

在双核系统框架下,通过数值法解主方程计算了双核间的核子跃迁全熔合几率.两碰撞核内部激发能由相对运动能损提供,因此能够将核子转移过程与相对运动耦合起来.对一些以Pb为靶的形成超重核的冷熔合反应,计算了最佳激发能、形成双核系统的俘获截面、复合核形成几率及存活几率等,所得到的形成超重核蒸发剩余截面与已知实验值符合较好.

In the concept of Dinuclear system (DNS) the complete fusion probability of two touch nuclei via nucleon transfer is described by numerically solving the Masterequation. The excitation energy of two colliding nuclei is supplied by the energy dissipation of their relative motion, thus the nucleon transfer process and the relative motion are coupled. For Pbbased cold fusion reactions to form super heavy nuclei, the optimal excitation energy, the capture crosssection to form a DNS, the compound nuclear formation probability, and the survival probability are calculated. The calculated super heavy nuclear evaporation residue crosssection are in agreement with known experimental data.