4.5 AGeV/c ^(16)O-Em作用末态产生粒子前后关联研究  

Investigation of Forward-backward Multiplicity Correlations in 4.5 AGeV/c ^(16)O-Em Interactions

作　　者：张东海[1] 刘明海[1] 

机构地区：[1]山西师范大学现代物理研究所物理系,山西临汾041004

出　　处：《原子能科学技术》2002年第6期548-553,共6页Atomic Energy Science and Technology

基　　金：山西自然科学基金资助项目 (9910 0 4) ;山西省回国留学基金资助项目

摘　　要：介绍了 4 5AGeV/c16O Em作用末态产生粒子的多重数分布 ;讨论了簇射粒子、灰径迹粒子和黑径迹粒子向前后半球内发射的关联。实验结果表明 :簇射粒子、灰径迹粒子在前后半球内的分布明显不同 ,而黑径迹粒子多重数在前后半球内的分布并无显著差别 ;在前半球内 ,簇射粒子及灰粒子数随后半球内的簇射粒子及灰粒子数的增加明显增加 ,且增加幅度随束流质量的增加而提高 ;后半球内的簇射粒子及灰粒子平均多重数随前半球内的簇射粒子及灰粒子数的增加而增加 ,但增加的幅度随射弹质量的增加而减弱。The multiplicity distributions and the correlations of shower, grey track and black track particles emerged in the forward( θ ≤90°) and backward ( θ >90°)hemisphere in case of 16 O-Em interactions at 4.5 AGeV/c are discussed in the paper. The results show that the distributions of gray and shower particles emerged in the forward and backward hemispheres are very different, but for black track particles no distinct difference is observed. The linear dependence of the multiplicity of produced particles in the forward and backward hemispheres is observed. The average values of shower and gray particles in the forward hemisphere increase strongly with the increasing of the number of shower and gray particles in the backward hemisphere, and this increasing slope increases with the increasing of beam masses (same energy). However, the mean number of gray and shower tracks in the backward increases weakly with the increasing of the number of gray and shower tracks in the forward hemisphere , and this increasing slope decreases with the increasing of beam masses (same energy).

关 键 词：粒子 核乳胶 多重数分布 核一核反应 高能核-核碰撞 氧16 多重数关联 

分 类 号：O571.6[理学—粒子物理与原子核物理]