目前,对于伽玛射线暴(Gamma Ray Burst,GRB)的探测,地面广延大气簇射实验由于阈能原因,对几十Ge V能区的宇宙线粒子探测无能为力,只有提高实验海拔才能实现更有效的观测。文章描述了在海拔5000m以上地区建造水切伦科夫(WCD)探测器阵列,...目前,对于伽玛射线暴(Gamma Ray Burst,GRB)的探测,地面广延大气簇射实验由于阈能原因,对几十Ge V能区的宇宙线粒子探测无能为力,只有提高实验海拔才能实现更有效的观测。文章描述了在海拔5000m以上地区建造水切伦科夫(WCD)探测器阵列,利用单粒子技术,来实现地面实验多GRB几十Ge V光子的正观测设想,为大规模实验提供预言支持。展开更多
Axial density profile of the gas-liquid-solid mixture in a slurry bubble column was measured by gamma-ray attenuation technology.Several measures for improving measurement precision were presented based on the discuss...Axial density profile of the gas-liquid-solid mixture in a slurry bubble column was measured by gamma-ray attenuation technology.Several measures for improving measurement precision were presented based on the discussion on attenuation law.It was found that the response frequency and the ray intensity should be as high as possible to improve the measurement precision.The mass absorption coefficient depended on not the object’s thickness but the location where the object was placed between the ray source and the detector.The results showed that the density in the column decreases with the increase of column height,which indicates that the measurement by gamma-ray attenuation is reasonable.展开更多
文摘目前,对于伽玛射线暴(Gamma Ray Burst,GRB)的探测,地面广延大气簇射实验由于阈能原因,对几十Ge V能区的宇宙线粒子探测无能为力,只有提高实验海拔才能实现更有效的观测。文章描述了在海拔5000m以上地区建造水切伦科夫(WCD)探测器阵列,利用单粒子技术,来实现地面实验多GRB几十Ge V光子的正观测设想,为大规模实验提供预言支持。
基金support from Major State Basic Research Development Program of China(973 Program,2005CB221205)is gratefully acknowledged.
文摘Axial density profile of the gas-liquid-solid mixture in a slurry bubble column was measured by gamma-ray attenuation technology.Several measures for improving measurement precision were presented based on the discussion on attenuation law.It was found that the response frequency and the ray intensity should be as high as possible to improve the measurement precision.The mass absorption coefficient depended on not the object’s thickness but the location where the object was placed between the ray source and the detector.The results showed that the density in the column decreases with the increase of column height,which indicates that the measurement by gamma-ray attenuation is reasonable.
