摘要
完成了19F+93Nb重离子耗散碰撞激发函数的两次独立测量.束流19F8+的入射能量100—108MeV,能量步长250keV;两次测量中分别使用了厚度为70和71μg/cm2的93Nb靶,其它宏观实验条件(例如,入射能量及能量步长,探测器及其探测角度,加速器、电子学以及数据获取系统的参数选取等等)则保持完全相同.实验结果表明,两次测量所得到的耗散产物截面的激发函数的不平滑结构具有不可重复性.这一实验结果支持了最近提出的理论预言:“在复杂量子碰撞中存在对初始条件的极端敏感性与混沌运动.”
Two independent measurements of excitation functions for the 19F +93 Nb dissipative heavy ion collisions have been performed at incident energies from 100 to 108 MeV in steps of 250 keV. The two measurements differed by two target foils, 70 and 71μg/cm2, respectively. All the other experimental conditions were kept to be identical in hath experiments. The data indicate nonreptaludbility of the non-self-averaging oscillating yields in the two measurements. This supports recent theoretical predictions of extreme sensitivity and chaos in complex quantum collisions.
出处
《高能物理与核物理》
EI
CSCD
北大核心
2000年第11期1060-1065,共6页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金!(19775057)
国家重点基础研究发展规划!(G2000077401)
关键词
重离子耗散碰撞
截面测量
不可重复性
混沌
dissipative heavy ion collision, non-reproducibility of the cross sections, chao\