小角度范围内弱束缚核^(17)F弹性散射微分截面的奇异行为(英文)  

Exotic Behavior of Elastic Scattering Differential Cross-Sections of Weakly Bound Nucleus ^(17)F at Small Angles

作　　者：韩建龙[1] 王琦[1] 肖志刚[1] 徐瑚珊[1] 孙志宇[1] 胡正国[1] 张雪荧[1] 王宏伟[1] 毛瑞士[1] 袁小华[1] 徐治国[1] 赵铁成[1] 张宏斌[1] 徐华根[1] 祁辉荣[1] 王玥[1] 贾飞[1] 武丽杰[1] 丁先利[1] 高启[1] 高辉[1] 李松林[1] 白真[1] 肖国青[1] 靳根明[1] 任中洲[2] 周善贵[3] SERGEY Yu-Kun 

机构地区：[1]中国科学院近代物理研究所 [2]兰州重离子加速器国家实验室原子核理论中心 [3]中国科学院理论物理所,北京100080 [4]Centro de Ciencias Físicas National University of Mexico (UNAM),Cuernavaca,Mexico Center for Nonlinear Physics,RSPhysSE,The Australian National University,Canberra ACT 0200,Australia

出　　处：《高能物理与核物理》2006年第11期1058-1061,共4页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10475101,10535010);国家重点基础研究发展规划项目(G2000077400)资助~~

摘　　要：在兰州放射性束流线(RIBLL)上完成了17F／17O+208Pb的弹性散射微分截面角分布测量．分析了17F／17O弹性散射产物微分截面的对数(ln(dσ／dθ))随散射角平方(θ2)的依赖关系．结果表明,在所测量的角度范围内(6°-20°),17O的这一依赖关系可以用一条直线很好地拟合,而17F的这一依赖关系需要两条不同斜率的直线才能拟合．17F数据拟合中的这种斜率改变可能起因于17F的奇异结构．对其他实验组数据的分析支持以上的结论,即在一定的角度范围内,弱束缚核与稳定核相比,弹性散射产物微分截面的对数与散射角平方的依赖关系有明显的差异,这可以作为深入研究“晕核”和“皮核”的一个新探针．The differential cross-sections for elastic scattering of ^17F and ^17O on ^208spb have been measured at Radioactive Ion Beam Line at Lanzhou （RIBLL）. The variation of the logarithms of differential cross-sections with the square of scattering angles shows clearly that there exists a turning point in the range of small scattering angles （6°-20°） for ^17F having exotic structure, while no turning point was observed in the ^17O elastic scattering. The experimental results have been compared with previous data. Systematical analysis on the available data seems to conclude that there is an exotic behavior of elastic scattering differential crosssections of weakly bound nuclei with halo or skin structure as compared with that of the ordinary nuclei near stable line. Therefore the fact that the turning point of the logarithms of differential cross-sections appears at small angle for weakly bound nuclei could be used as a new probe to investigate the halo and skin phenomenon.

关 键 词：弹性散射 微分截面 晕核 

分 类 号：O571.4[理学—粒子物理与原子核物理]