弱束缚原子核反应函数的系统学研究  

Systematic study on reaction function of weakly bound nuclei

作　　者：张高龙[1] 杨晓鹏[1] 张焕乔[2] 

机构地区：[1]北京航空航天大学物理科学与核能工程学院,北京100191 [2]中国原子能科学研究院,北京102413

出　　处：《核技术》2014年第10期37-40,共4页Nuclear Techniques

基　　金：国家自然科学基金(No.11175011;No.11035007;No.11235002)资助

摘　　要：破裂反应在弱束缚原子核的散射中是一个重要的反应道,尤其是在亚垒能区,实验上已尽力去研究破裂对亚垒熔合的影响。为了探索弱束缚原子核在不同靶核上的破裂道对于熔合截面的耦合效应的强弱,我们系统地分析了弱束缚原子核的弹性散射实验数据,并得到反应总截面。利用圣保罗势得到势垒参数,这样就可以得到弱束缚原子核在轻靶、中重靶和重靶上的反应函数F(x),然后与没有耦合道效应的普适函数F0(x)进行了比较。从两者的对比上,可以得到弱束缚原子核在轻靶上的破裂贡献小,在能量高于库仑位垒能区在中重靶和重靶上的破裂被压低,在亚垒能区有些弱束缚原子核在中重靶和重靶上的破裂增强,因此弱束缚原子核在中重靶和重靶上的研究还需要更多的实验。Background： Breakup is an important reaction channel in the scattering of loosely bound nuclei especially at sub-barrier energies. Experimental efforts have been put to study the influence of breakup on sub-barrier fusion. Purpose： In order to explore the breakup effects of weakly bound nuclei on different target nuclei, we systematically analyzed the angular distribution of their elastic scatterings. Methods： The barrier parameters of reaction systems were obtained by the Sao Paulo potential, and the total cross sections were obtained from the experimental angular distribution of elastic scattering. Results： The F（x）s were obtained for weakly and tightly bound projectiles on light, medium-mass and heavy target nuclei, and compared with the universal function Fo（x） which has no coupling channels. Conclusion： From the comparison we can conclude that the breakup effect is not important for weakly bound projectiles on the light target nuclei, while it is suppressed on medium-mass and heavy target nuclei above the Coulomb barrier and is enhanced for some weakly bound projectiles at sub-barrier energies. More experiments need to be developed on medium-mass and heavy target nuclei.

关 键 词：反应函数 弱束缚原子核 弹性散射 动力学效应 

分 类 号：TL67[核科学技术—核技术及应用]