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.
出处
《高能物理与核物理》
EI
CSCD
北大核心
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~~
关键词
耗散反应产物
微分截面
几率分布
统计性质
dissipative product, differential cross section, probability distribution, statistical property
