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

  • 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.
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  • [1] . Danielewicz P, Lacey R, Lynch W G. Science, 2002, 298:15922. Lattimer J M, Prakash M. Phys. Rep., 2000, 333: 1213. Toro M Di et al. Nucl. Phys., 2001, A681: 426c4. Prakash M et al. Phys. Rep., 1997, 280: 15. Myers W D, Swiatechi W J. Nucl. Phys., 1996, A81: 16. Pomorski K, Dudek J. Phys. Rev., 2003, C67: 0443167. LI B A, KO C M, REN Z Z. Phys. Rev. Lett., 1997, 78:16448. TAN W P et al. Phys. Rev., 2001, C64: 0519059. XU H S et al. Phys. Lett., 2000, 85: 71610. CHEN L W, KO C M, LI B A. Phys. Rev., 2004, C68:05460611. SHI L, Danielewicz P. Phys. Rev., 2003,A68: 06460412. LI B A. Phys. Rev. Lett., 2002, 88: 192701; Nucl. Phys.,2002, A708: 36513. YONG G Ch. Chin. Phys. Soc., 2005, 14: 154914. LI B A. Phys. Rev., 2000, C64: 05460415. Bertsch G F. Subal Das Gupta. Phys. Reorts., 1988,160(4): 189-23316. LI B A et al. Talk Given at the 21st Winter Workshop on Nuclear Dynamics. USA February 5-12, 200517. LI B A, Champak B. Das Subal Das Gupta and Charles Gale. Nucl. Phys., 2004, A563-584
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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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Probing the High Density Behavior of the Symmetry Energy by Using the Free Neutron-Proton Ratio

    Corresponding author: ZUO Wei,
  • 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

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.

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