熔合势垒厚度对熔合截面的影响  

The Influence of the Fusion Barrier Thickness on the Fusion Cross Sections

作　　者：张玉峰[1] 田俊龙[1] 

机构地区：[1]安阳师范学院物理与电气工程学院,河南安阳455000

出　　处：《郑州大学学报（理学版）》2013年第3期68-71,共4页Journal of Zhengzhou University:Natural Science Edition

基　　金：国家自然科学基金资助项目;编号11005003;11005002;U1204115;河南省教育厅自然科学研究项目;编号2011A140001;12B140001;河南省高等学校青年骨干教师项目;编号2011GGJS-147

摘　　要：用多级势近似的方法计算了不同熔合势垒厚度对反应体系16O+208Pb熔合几率的影响.计算表明,对垒下熔合,随着势垒厚度的增加,隧穿几率快速下降,入射能越低下降的越快;对垒上熔合,隧穿几率会随着势垒厚度的增加而增加,入射能越大上升的越快.如果选择适当的势垒厚度,可以使计算结果与实验数据符合的更好.这为进一步澄清熔合反应中熔合势垒的形状、极端垒下重离子熔合机制等相关研究提供参考.The influence of different potential barrier thickness on fusion probability was investigated by applying the method of multistep potential approximation. It was demonstrated that： I ） For sub-barrier fusion, the tunneling probability decreased with the increase of the thickness of the potential barrier. The lower incident energy was, the faster the tunneling probability fell. 2） For above barrier fusion, the tun- neling probability increased with increasing thickness of the potential barrier, the higher the incident en- ergy was, the faster the tunneling probability rose. The calculated results were in agreement with the ex- perimental data by selecting suitable barrier thickness. This result played an important role for further study of the shape of potential in the fusion reactions, and the mechanism of deep sub-barrier fusion reaction.

关 键 词：熔合势垒 熔合几率 多级势近似 熔合截面 Bass势 

分 类 号：O571.4[理学—粒子物理与原子核物理]