~6Li+~(208)Pb光学势灵敏半径的能量相依性

光学势灵敏区域的确定是研究光学势性质的先决要素。本工作利用扰动法,抽取并研究了弱束缚体系~6Li+~(208)Pb光学势灵敏区域的能量相依性。结果表明,该体系光学势实部和虚部的灵敏区域均呈现多峰结构。内部的灵敏区域对应体系库仑势垒的穿透过程,其位置基本不随能量的变化而改变;而外部的灵敏区域则对应体系的表面相互作用过程,并且存在强烈的能量相依性。采用新的灵敏区域重新检测了~6Li+~(208)Pb光学势的性质,结果表明在新的灵敏区域内,~6Li+~(208)Pb光学势虚部表现出传统的阈异常现象,而并非之前所观察到的破裂阈异常现象。

Energy Dependence of Sensitive Radius of Optical Model Potential for 6Li+ 208Pb

The sensitive region is the most fundamental ingredient in the study of the optical model potential .In the present work ,the sensitive regions of the potential of 6Li+ 208Pb were extracted and studied by using notch method .The results show that multi-peak structure is observed for both the sensitive regions of real and imaginary parts of the optical model potential . The inner sensitive region corresponds to the Coulomb barrier penetration process and the position of which does not vary with the interaction energy , while the outer sensitive region , which arising from the surface interaction process ,presents strong dependence on the interaction energy .With the new sensitive region , the properties of the optical model potential of 6 Li+ 208 Pb were re-checked .The threshold anomaly ,not the breakup threshold anomaly ,is found in the imaginary part of the optical potential .