Probing Nuclear Symmetry Energy with the Sub-threshold Pion Production
ZHANG Fang1**,LIU Yang2,YONG Gao-Chan2,ZUO Wei2
1School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000 2Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000
Probing Nuclear Symmetry Energy with the Sub-threshold Pion Production
ZHANG Fang1**,LIU Yang2,YONG Gao-Chan2,ZUO Wei2
1School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000 2Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000
摘要Within the framework of the semiclassical Boltzmann–Uehling–Uhlenbeck transport model, we investigate the effects of symmetry energy on the sub-threshold pion using the isospin MDI interaction with the stiff and soft symmetry energies in the central collision of 48Ca+48Ca at the incident beam energies of 100, 150, 200, 250 and 300 MeV/nucleon. We find that the ratio of π−/π+ of sub-threshold charged pion production is greatly sensitive to the symmetry energy, particularly around 100 MeV/nucleon energies. Large sensitivity of sub-threshold charged pion production to nuclear symmetry energy may reduce uncertainties of probing nuclear symmetry energy via heavy-ion collision.
Abstract：Within the framework of the semiclassical Boltzmann–Uehling–Uhlenbeck transport model, we investigate the effects of symmetry energy on the sub-threshold pion using the isospin MDI interaction with the stiff and soft symmetry energies in the central collision of 48Ca+48Ca at the incident beam energies of 100, 150, 200, 250 and 300 MeV/nucleon. We find that the ratio of π−/π+ of sub-threshold charged pion production is greatly sensitive to the symmetry energy, particularly around 100 MeV/nucleon energies. Large sensitivity of sub-threshold charged pion production to nuclear symmetry energy may reduce uncertainties of probing nuclear symmetry energy via heavy-ion collision.
2012, Vol. 29 
