Effect of entrance-channel asymmetry on the isospin dependence of nucleon emission in heavy ion collisions

  • Using the isospin- and momentum-dependent hadronic transport model IBUU04, we have investigated the influence of the entrance-channel isospin asymmetry on the sensitivity of the pre-equilibrium neutron/proton ratio to symmetry energy in central heavy-ion collisions induced by high-energy radioactive beams. Our analysis and discussion are based on the dynamical simulations of the three
    isotopic reaction systems 132Sn+124Sn, 124Sn+112Sn and 112Sn+112Sn which are of the same total proton number but different isospin asymmetry. We find that the kinetic-energy distributions of the pre-equilibrium neutron/proton ratio are quite sensitive to the density-dependence of symmetry energy at incident
    beam energy E/A=400MeV, and the sensitivity increases as the isospin asymmetry of the reaction system increases.

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ZHANG Fang, ZUO Wei, CHEN Ji-Yan and ZHOU Zhen-Xiao. Effect of entrance-channel asymmetry on the isospin dependence of nucleon emission in heavy ion collisions[J]. Chinese Physics C, 2008, 32(7): 561-564. doi: 10.1088/1674-1137/32/7/010
ZHANG Fang, ZUO Wei, CHEN Ji-Yan and ZHOU Zhen-Xiao. Effect of entrance-channel asymmetry on the isospin dependence of nucleon emission in heavy ion collisions[J]. Chinese Physics C, 2008, 32(7): 561-564.  doi: 10.1088/1674-1137/32/7/010 shu
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Received: 2007-07-24
Revised: 2008-03-27
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Effect of entrance-channel asymmetry on the isospin dependence of nucleon emission in heavy ion collisions

    Corresponding author: ZUO Wei,

Abstract: 

Using the isospin- and momentum-dependent hadronic transport model IBUU04, we have investigated the influence of the entrance-channel isospin asymmetry on the sensitivity of the pre-equilibrium neutron/proton ratio to symmetry energy in central heavy-ion collisions induced by high-energy radioactive beams. Our analysis and discussion are based on the dynamical simulations of the three
isotopic reaction systems 132Sn+124Sn, 124Sn+112Sn and 112Sn+112Sn which are of the same total proton number but different isospin asymmetry. We find that the kinetic-energy distributions of the pre-equilibrium neutron/proton ratio are quite sensitive to the density-dependence of symmetry energy at incident
beam energy E/A=400MeV, and the sensitivity increases as the isospin asymmetry of the reaction system increases.

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