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Average Property of Isospin Effects Induced by Neutron-Halo Nuclei

Chinese Physics Letters 2006年第10期23卷 2710-2713页

作者：刘建业肖国青左维李希国 Institute of Modern Physics Chinese Academy of Sciences PO Box 31 Lanzhou 730000 Institute of Basic Physics College of Mathematics-Physics and Information Tianshui Normal University Tianshui 741000 Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000

We study the average property of the isospin effects of reaction mechanism induced by neutron-halo nuclei within the isospin-dependent quantum molecular dynamics model. We find that the extended neutron density distribution for the neutron-halo projectile brings an important isospin effect into the reaction mechanism, which induces the decrease of nuclear stopping R; however, it induces the obvious increases of the neutron-proton ratio of nucleon emissions （n/p）nucl for all of the beam energies in this work, compared to the same mass stable colliding system.

关键词： HEAVY-ION COLLISIONS interaction cross-sections MODEL FRAGMENTATION RADII BE-14

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Sensitive Probe for Symmetry Potential

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Chinese Physics Letters 2007年第3期24卷 660-663页

作者：刘建业肖国青郭文军任中洲左维李希国 Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 Institute of Modern Physics Chinese Academy of Sciences PO Box 31 Lanzhou 730000 Institute of Basic Physics College of Mathematics-Physics and Information Tianshui Normal University Tianshui 741000 Department of Physics Nanjing University Nanjing 210008 5Science College University of Shanghai for Science and Technology Shanghai 200093 Science College University of Shanghai for Science and Technology Shanghai 200093

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

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