Surface Diffuseness Anomaly in ^16O＋^208pb Quasi-elastic Scattering at Backward Angle  

作　　者：贾会明 林承键 张焕乔 刘祖华 杨峰 贾飞 张春雷 安广朋 吴振东 徐新星 白春林 喻宁 

机构地区：[1]China Institute of Atomic Energy, Beijing 102413

出　　处：《Chinese Physics Letters》2008年第8期2834-2836,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10575135, 10575134, 10675169 and 10735100, and the Major State Basic Research Programme of China under Grant No 2007CB815003.

摘　　要：The quasi-elastic scattering excitation function of the doubly magic ^16O＋^208 Pb system at a backward angle is measured at sub-barrier energies with high precision. The diffuseness parameters extracted from both the singlechannel and the coupled-channels calculations give almost the same value a = 0.76 ± 0.04 fro. The results show that the coupling effect is negligible for the spherical system. The obtained value is smaller than the extracted value from the fusion excitation function, but larger than the value of a -- 0.63 fm, which is from the systematic analysis of elastic scattering data.The quasi-elastic scattering excitation function of the doubly magic ^16O＋^208 Pb system at a backward angle is measured at sub-barrier energies with high precision. The diffuseness parameters extracted from both the singlechannel and the coupled-channels calculations give almost the same value a = 0.76 ± 0.04 fro. The results show that the coupling effect is negligible for the spherical system. The obtained value is smaller than the extracted value from the fusion excitation function, but larger than the value of a -- 0.63 fm, which is from the systematic analysis of elastic scattering data.

关 键 词：the power-law exponents precipitation durative abrupt precipitation change 

分 类 号：O43[机械工程—光学工程]