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Chinese Physics C> 2005, Vol. 29> Issue(4) : 366-370 

Study on Stiffness of the Symmetry Energy at High Densities by π－/π+ Ratio

  •  Institute of Modern Physics,CAS,Lanzhou 730000,China2 Graduate School,CAS,Beijing 100049,China3 Department of Chemistry and Physics,P.O.Box 419,Arkansas State University,State University,Arkansas 72467-0419,USA

  • using the isospin–and momentum–dependent transport model, for three different symmetry energies, we have calculated the π–/π+ ratio as a function of time and tranverse–momentum in central 132sn+124 sn collision at e_beam/A=400mev. the results show that the π–/π+ ratios is very sensitive to the stiffness of the symmetry energy. thus we can probe the stiffness of the symmetry energy at high densities by using the π–/π+ ratio at different time or transverse momentum more accurately than before. comparing experimental data with the calculations will reveal crucial information about the stiffness of the symmetry energy more accurately.hadronic transport model, symmetry energy, π–/π+ ratio
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YONG Gao-Chan, Bao An Li and ZUO Wei. Study on Stiffness of the Symmetry Energy at High Densities by π－/π+ Ratio[J]. Chinese Physics C, 2005, 29(4): 366-370.
YONG Gao-Chan, Bao An Li and ZUO Wei. Study on Stiffness of the Symmetry Energy at High Densities by π－/π+ Ratio[J]. Chinese Physics C, 2005, 29(4): 366-370. shu
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Received: 2004-10-08
Revised: 1900-01-01
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Study on Stiffness of the Symmetry Energy at High Densities by π－/π+ Ratio

    Corresponding author: YONG Gao-Chan,
  • Institute of Modern Physics,CAS,Lanzhou 730000,China2 Graduate School,CAS,Beijing 100049,China3 Department of Chemistry and Physics,P.O.Box 419,Arkansas State University,State University,Arkansas 72467-0419,USA
  • Received Date: 2004-10-08
  • Accepted Date: 1900-01-01
  • Available Online: 2005-04-05

Abstract: using the isospin–and momentum–dependent transport model, for three different symmetry energies, we have calculated the π–/π+ ratio as a function of time and tranverse–momentum in central 132sn+124 sn collision at e_beam/A=400mev. the results show that the π–/π+ ratios is very sensitive to the stiffness of the symmetry energy. thus we can probe the stiffness of the symmetry energy at high densities by using the π–/π+ ratio at different time or transverse momentum more accurately than before. comparing experimental data with the calculations will reveal crucial information about the stiffness of the symmetry energy more accurately.hadronic transport model, symmetry energy, π–/π+ ratio

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