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

• 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 first- order source function moments can describe the source sizes. The ratio of the normalized standard deviation σ to the first-order moment R, σ/R, is sensitive to the shape of the source function.
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YIN Hong-Jie and ZHANG Wei-Ning. Interferometry imaging for the evolving source in heavy ion collisions at HIRFL-CSR energy[J]. Chinese Physics C, 2012, 36(3): 216-221. doi: 10.1088/1674-1137/36/3/005
YIN Hong-Jie and ZHANG Wei-Ning. Interferometry imaging for the evolving source in heavy ion collisions at HIRFL-CSR energy[J]. Chinese Physics C, 2012, 36(3): 216-221.
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沈阳化工大学材料科学与工程学院 沈阳 110142

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

###### Corresponding author: ZHANG Wei-Ning,

Abstract: 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 first- order source function moments can describe the source sizes. The ratio of the normalized standard deviation σ to the first-order moment R, σ/R, is sensitive to the shape of the source function.

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