Interferometry imaging for the evolving source in heavy ion collisions at HIRFL-CSR energy  

作　　者：尹洪杰 M.J.Efaaf 张卫宁 

机构地区：[1]School of Physics and Optoelectronic Technology,Dalian University of Technology [2]Department of Physics,Harbin Institute of Technology [3]Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Accelerator of Lanzhou

出　　处：《Chinese Physics C》2012年第3期216-221,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (11075027)

摘　　要：Imaging analysis of two-pion interferometry is performed for an evolving particle-emitting source in heavy ion collisions at HIRFL-CSR energy. The source evolution is described by the relativistic hydrodynamics in （2＋1） dimensions. The model-independent characteristic quantities of the source are investigated and compared with the interferometry results obtained by the usual Gaussian formula fit. It is found that the firstorder source function moments can describe the source sizes. The ratio of the normalized standard deviation to the first-order moment R,σ/R, is sensitive to the shape of the source function.Imaging analysis of two-pion interferometry is performed for an evolving particle-emitting source in heavy ion collisions at HIRFL-CSR energy. The source evolution is described by the relativistic hydrodynamics in （2＋1） dimensions. The model-independent characteristic quantities of the source are investigated and compared with the interferometry results obtained by the usual Gaussian formula fit. It is found that the firstorder source function moments can describe the source sizes. The ratio of the normalized standard deviation to the first-order moment R,σ/R, is sensitive to the shape of the source function.

关 键 词：INTERFEROMETRY IMAGING evolving sources heavy ion collisions HIRFL-CSR energy 

分 类 号：O572.21[理学—粒子物理与原子核物理]