~7Li+^(11)B体系唯象光学势的研究

Study of ~7Li+^(11)B Phenomenological Optical Model Potentials

实验测量了7Li+11B体系的弹性散射角分布,其中弹核7Li的入射能量分别为9.85,13.3,18.3,23.3和28.3 MeV,测量的角度范围为θc.m.≈15～80。通过对本次实验数据以及文献中34 MeV的数据拟合,抽取了该体系的唯象光学势参数。结果表明,在固定作用势形状因子下,势深度与能量具有线性相依的关系:实部深度随着弹核能量的增加而线性减小,而虚部深度则在平均值10.35 MeV附近变化。

Angular distributions of 7Li＋llB elastic scattering were measured at Elab（7Li）=9.85, 13.3, 18.3, 23.3 and 28.3 MeV within the angular range of θc.m.≈15°～80°. The analyse of these angular distributions together with the data taken from literatures at Elab（TLi） = 34 MeV have been performed to extract the parameters of optical model potential. With the fixed geometrical shapes, the potential strengths show a concise relation to the reaction energy： the depths of real potential decrease linearly with energy increasing, whereas the depths of imaginary part just slightly vary around the average value of 10.35 MeV.