摘要Within the hadronic transport model IBUU04, we investigate the effect of density-dependent symmetry energy on double neutron/proton (n/p) ratio of free nucleons in heavy ion collisions by taking four isotopic Sn+Sn reaction systems. Especially the entrance-channel asymmetry and impact-parameter dependence of the effect of symmetry energy are discussed. It is found that in both central and semi-central collisions the sensitivity of the double n/p ratio to the density-dependent symmetry energy is more pronounced in neutron-richer systems. Our results also indicate clearly that the effect of symmetry energy is stronger in central collisions than that in semi-central collisions.
Abstract：Within the hadronic transport model IBUU04, we investigate the effect of density-dependent symmetry energy on double neutron/proton (n/p) ratio of free nucleons in heavy ion collisions by taking four isotopic Sn+Sn reaction systems. Especially the entrance-channel asymmetry and impact-parameter dependence of the effect of symmetry energy are discussed. It is found that in both central and semi-central collisions the sensitivity of the double n/p ratio to the density-dependent symmetry energy is more pronounced in neutron-richer systems. Our results also indicate clearly that the effect of symmetry energy is stronger in central collisions than that in semi-central collisions.
(Monte Carlo simulations (including hadron and parton cascades and string breaking models))
引用本文:
ZHANG Fang;ZUO Wei. Entrance-Channel Dependence of Isospin Effects on Double n/p Ratio in HIC[J]. 中国物理快报, 2008, 25(7): 2436-2439.
ZHANG Fang, ZUO Wei. Entrance-Channel Dependence of Isospin Effects on Double n/p Ratio in HIC. Chin. Phys. Lett., 2008, 25(7): 2436-2439.
2008, Vol. 25 
