^(19)F+^(27)Al耗散反应产物截面测量中的不重复性  

Non-reproducibility of the Cross Sections of the Products Induced from Dissipative Reaction of ^(19)F+^(27)Al

作　　者：韩建龙[1] 王琦[1] 董玉川[1] 李松林[1] 段利敏[1] 吴和宇[1] 徐华根[1] 陈若富[1] 徐瑚珊[1] 白真[1] 李志常[2] 路秀琴[2] 赵葵[2] 周平[2] 刘建成[2] 许国基[2] Sergey Yu Kun 

机构地区：[1]中国科学院近代物理研究所 [2]中国原子能科学研究院,北京102413 [3]Centro de Ciencias Fisicas,Campus Morelos UNAM,Cuernavaca,Morales,Mexico Nonlinear Physics Group and Department of Theoretical Physics,RSPhysSE,ANU,Canberra,ACT 0200,Australia

出　　处：《高能物理与核物理》2006年第2期108-112,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10475101;10175083)国家重点基础研究发展规划项目(G2000077400)科技部重大项目前期研究专项基金(2001CCB01200)资助~~

摘　　要：在中国原子能科学研究院的HI-13串列静电加速器上完成了114MeV和118．75MeV的19F+27Al 耗散反应产物B,C,N,O,F,Ne,Na和Mg的微分截面测量．条形27Al同位素靶的大小尺寸为 10mm×50mm,平均厚度约67μg／cm2．固定入射束流19F的能量,通过移动靶位,先后轰击了靶上20个不同的位置．实验结果表明,在弹靶系统、入射能量以及探测系统都相同的多次独立的微分截面测量中,截面的涨落不呈现高斯型几率分布．截面测量的这种不重复现象难以用有限计数率的统计性质来解释．The differential cross sections of the dissipative products B, C, N, O, F, Ne, Na and Mg induced from the reactions of ^19F＋^27Al at two incident energies have been measured at the HI-13 tandem accelerator, Beijing. In the case of a fixed beam incident energy ll4MeV or l18.75MeV respectively, identical reaction system and the same detection system, 20 target points in steps of 2ram on a 10mmx50mm rectangular A1 foil have been bombarded. The experimental results indicate that the probability distribution of the cross sections is much wider than a standard Gaussian distribution. This non-reproducibility of the cross sections can＇t be interpreted by the statistical property of a finite count rate.

关 键 词：耗散反应产物 微分截面 几率分布 统计性质 

分 类 号：O571.4[理学—粒子物理与原子核物理]