^(19)F+^(93)Nb耗散反应产物激发函数中截面测量的不重复性  

Non-reproducibility of the Cross Sections Measured in ^(19)F+^(93)Nb Dissipative Reactions

作　　者：王琦[1] 田文栋[1] 李松林[1] 江中和[1] 董玉川[1] 李志常[2] 路秀琴[2] 赵葵[2] 符长波[2] 刘建成[2] 姜华[2] 胡桂青[2] 

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国原子能科学研究院,北京102413

出　　处：《高能物理与核物理》2002年第2期141-147,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 1 9775 0 5 7;1 0 1 75 0 83);国家重点基础研究发展规划 (G2 0 0 0 0 774 0 1 )~~

摘　　要：完成了 1 9F + 93Nb重离子耗散碰撞激发函数的两次独立测量 .束流的入射能量为 1 0 0— 1 0 8MeV ,步长 2 50keV .两次测量的宏观条件几乎完全一样 ,惟一的差别是使用了厚度分别为 70和 71 μg cm2 的两块 93Nb同位素靶 .实验结果表明 :( 1 )两次测量所得到的耗散反应产物激发函数的涨落具有不可平滑的结构 ;( 2 )这种不平滑的涨落截面有不重复的迹象 .着重从实验的角度对这一结果进行了讨论 .Two independent measurements of excitation functions in the dissipative collisions of 19 F+ 93 Nb have been performed at incident energies from 100 to 108 MeV in steps of 250 keV. The two measurements differed by the thickness of the target foils, 70μg/cm 2 and 71μg/cm 2, respectively. All the other experimental conditions, the accelerator, the incident energies and steps, the scattering chamber, the detection system, the electronics, the acquisition system and all the parameters selected in the two measurements, were kept to be identical in both experiments. The data indicate non reproducibility of the non self averaging oscillating yields in the two independent measurements. The indication of the non reproducibility of the cross sections is discussed.

关 键 词：重离子耗散碰撞 截面不重复 激发函数 截面测量 非弹性碰撞 核反应 

分 类 号：O571.4[理学—粒子物理与原子核物理]