Sensitive Probe for Symmetry Potential  

作　　者：刘建业 肖国青 郭文军 任中洲 左维 李希国 

机构地区：[1]Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000 [2]Institute of Modern Physics, Chinese Academy of Sciences, PO Box 31, Lanzhou 730000 [3]Institute of Basic Physics, College of Mathematics-Physics and Information, Tianshui Normal University, Tianshui 741000 [4]Department of Physics, Nanjing University, Nanjing 210008 5Science College, University of Shanghai for Science and Technology, Shanghai 200093 [5]Science College, University of Shanghai for Science and Technology, Shanghai 200093

出　　处：《Chinese Physics Letters》2007年第3期660-663,共4页中国物理快报（英文版）

基　　金：Supported by the State Key Basic Research and Development Programme of China under Grant No G2000077400, the National Natural Science Foundation of China under Grant Nos 10435080, 105350101, 10447006 and 10575075, the Knowledge Innovation Project of Chinese Academy of Sciences under Grant No KJCX2-SW-N02.

摘　　要：Based on both very obvious isospin effect of the neutron-proton number ratio of nucleon emissions （n/p）nud on symmetry potential and （n/p）nucl＇s sensitive dependence on symmetry potential in the nuclear reactions induced by halo-neutron projectiles, compared to the same mass stable projectile, probing symmetry potential is investigated within the isospin-dependent quantum molecular dynamics with isospin and momentum-dependent interactions for different symmetry potentials U;ym and U2^sym. It is found that the neutron-halo projectile induces very obvious increase of （n/p）nucl and strengthens the dependence of （n/p） l on the symmetry potential for all the beam energies and impact parameters, compared to the same mass stable projectile under the same incident channel condition. Therefore （n/p）nucl induced by the neutron-halo projectile is a more favourable probe than the normal neutron-rich and neutron-poor projectiles for extracting the symmetry potential.Based on both very obvious isospin effect of the neutron-proton number ratio of nucleon emissions （n/p）nud on symmetry potential and （n/p）nucl＇s sensitive dependence on symmetry potential in the nuclear reactions induced by halo-neutron projectiles, compared to the same mass stable projectile, probing symmetry potential is investigated within the isospin-dependent quantum molecular dynamics with isospin and momentum-dependent interactions for different symmetry potentials U;ym and U2^sym. It is found that the neutron-halo projectile induces very obvious increase of （n/p）nucl and strengthens the dependence of （n/p） l on the symmetry potential for all the beam energies and impact parameters, compared to the same mass stable projectile under the same incident channel condition. Therefore （n/p）nucl induced by the neutron-halo projectile is a more favourable probe than the normal neutron-rich and neutron-poor projectiles for extracting the symmetry potential.

关 键 词：HEAVY-ION COLLISIONS INTERACTION CROSS-SECTIONS FRAGMENTATION ENERGIES NUCLEI RADII MODEL 

分 类 号：O57[理学—粒子物理与原子核物理]