Source Density Distribution and Intensity Interferometry in High-energy Heavy-ion Collisions

Liu Yiming; Huo Lei; Jiang Yuzhen; Wang Shan; D. Keane; S. Y. Fung; S. Y. Chu

Chinese Physics C> 1991, Vol. 15> Issue(S1) : 33-41

Source Density Distribution and Intensity Interferometry in High-energy Heavy-ion Collisions

Liu Yiming ¹ ,
Huo Lei ¹ ,
Jiang Yuzhen ¹ ,
Wang Shan ¹ ,
D. Keane ² ,
S. Y. Fung ³ ,
S. Y. Chu ³

1 Department of Physics, Harbin Institute of Technology, Harbin, Heilongjiang, China;
2 Department of Physics, Kent State University, Kent, Ohio, USA;
3 Departmcnt of Physics, University of California, Riverside, California, USA

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Abstract：
The fitted spatial parameter from intensity interferometry is related to an average radius <r> of the particle-emitting source. The mean-square radius〈r²〉of the source can be estimated by the small relative momentum correlation function. More detailed information about the source density distribution can be inferred from the value of k=<r²>/<r>². A study of central collisions of 1.8 A GeV Ar + Pb at the Bevalac streamer chamber shows that the data are consistent with an a priori Gaussian model for the density distribution at the present level of experimental accuracy. The average radius of the pion source in the reaction is deduced, and a possible picture to describe the expanding pion source is presented.

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Liu Yiming, Huo Lei, Jiang Yuzhen, Wang Shan, D. Keane, S. Y. Fung and S. Y. Chu. Source Density Distribution and Intensity Interferometry in High-energy Heavy-ion Collisions[J]. Chinese Physics C, 1991, 15(S1): 33-41.

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Received: 1990-08-28

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Supported by the National Natural Science Foundation of China and United States Funding Agencies.

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沈阳化工大学材料科学与工程学院沈阳 110142

Source Density Distribution and Intensity Interferometry in High-energy Heavy-ion Collisions

1 Department of Physics, Harbin Institute of Technology, Harbin, Heilongjiang, China;
2 Department of Physics, Kent State University, Kent, Ohio, USA;
3 Departmcnt of Physics, University of California, Riverside, California, USA

Received Date: 1990-08-28

Fund Project: Supported by the National Natural Science Foundation of China and United States Funding Agencies.

Abstract: The fitted spatial parameter from intensity interferometry is related to an average radius <r> of the particle-emitting source. The mean-square radius〈r²〉of the source can be estimated by the small relative momentum correlation function. More detailed information about the source density distribution can be inferred from the value of k=<r²>/<r>². A study of central collisions of 1.8 A GeV Ar + Pb at the Bevalac streamer chamber shows that the data are consistent with an a priori Gaussian model for the density distribution at the present level of experimental accuracy. The average radius of the pion source in the reaction is deduced, and a possible picture to describe the expanding pion source is presented.