Probing the High Density Behavior of the Symmetry Energy by Using the Free Neutron-Proton Ratio

ZHANG Fang; ZUO Wei; YONG Gao-Chan

Chinese Physics C> 2007, Vol. 31> Issue(9) : 815-818

Probing the High Density Behavior of the Symmetry Energy by Using the Free Neutron-Proton Ratio

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2 Department of Physics and Technology of Lanzhou University, Lanzhou 730000, China3 Graduate University of Chinese Academy of Sciences, Beijing 100049, China4 Center of Theoretical Physics and Interdisciplinary Physics, Lanzhou 730000, China

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Abstract：
Based on the isospin- and momentum-dependent transport model IBUU04, the transverse momentum distributions of the free neutron-proton ratio in the ¹³²Sn+¹²⁴Sn reaction system at mid-central collisions with beam energies of 400/AMeV, 600/AMeV and 800/AMeV are studied by using two different symmetry energies. It is found that the free neutron-proton ratio as a function of the transverse momentum at the mid-rapidity is very sensitive to the density dependency of the symmetry energy especially at incident energies around 400/AMeV.

References

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ZHANG Fang, ZUO Wei and YONG Gao-Chan. Probing the High Density Behavior of the Symmetry Energy by Using the Free Neutron-Proton Ratio[J]. Chinese Physics C, 2007, 31(9): 815-818.

ZHANG Fang, ZUO Wei and YONG Gao-Chan. Probing the High Density Behavior of the Symmetry Energy by Using the Free Neutron-Proton Ratio[J]. Chinese Physics C, 2007, 31(9): 815-818. shu

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Received: 2006-07-31
Revised: 2007-02-06

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