Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (10): 100517-100517.doi: 10.11889/j.0253-3219.2014.hjs.37.100517


Blast-wave analysis for the radial flow of Au+Au collisions at 1 A GeV

LYV Ming1,2 MA Yugang1 ZHANG Guoqiang1 CHEN Jinhui1 FANG Deqing1 CAO Xiguang1 ZHOU Chenglong1,2 HE Wanbing1,2 DAI Zhitao1,2 LIU Yingdu1,2 WANG Tingting1,2   

  1. 1(Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China) 2(University of Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2014-07-22 Revised:2014-09-05 Online:2014-10-10 Published:2014-10-16

Abstract: Background: Heavy ion reaction is a unique method to investigate the high temperature and density nuclear matter in laboratory, and the radial flow is a very important experimental probe. Purpose: This paper aims to obtain the radial flow and freeze-out temperature and then compare them with experimental results. Methods: By simulating the Au+Au collision at 1 A GeV in the Isospin dependent Quantum Molecular Dynamics (IQMD) framework, the Blast-wave model was applied to fitting the proton transverse momentum spectra and getting the radial flow and freeze-out temperature. Results: Results show that the radial flow decreases from central to peripheral collisions, and the value at central collisions is consistent with the FOPI experimental result and other theory results. Additionally, the radial flow profile ? has been analyzed in details and ?=0.336 has been determined in this work. Conclusion: The Blast-wave model can nicely describe the proton transverse momentum spectra, and give a reasonable radial flow value in comparison with the FOPI and EOS experimental results. Varying the flow profile ? leads to a large change on the shape of proton and deuteron spectra, and the value between 0?1 is supported.

Key words: Heavy ion collisions, Centrality, Radial flow, Freeze out temperature, Radial flow profile