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...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＋l12Sn and 112Sn＋l12Sn 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 =400 MeV, and the sensitivity increases as the isospin asymmetry of the reaction system increases.展开更多
基金Supported by National Natural Science Foundation of China(10575119,10775061)Knowledge Innovation Project of Chinese Academy of Sciences(KJCX3-SYW-N2)+2 种基金Major State Basic Research Developing Program of China(2007CB815004)CAS/SAFEA International Partnership Program for Creative Research Teams(CXTD-J2005-1)the Asia-Link Project of the European Commission(CN/ASIA-LINK/008(94791))
文摘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＋l12Sn and 112Sn＋l12Sn 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 =400 MeV, and the sensitivity increases as the isospin asymmetry of the reaction system increases.
