密度分布对原子核阻止同位旋效应的影响

利用同位旋相关的量子分子动力学（IQMD）模型，分析了中能重离子碰撞过程中相对论平均场和SkyrmeHartrere－Fork等核结构模型给出的核密度分布对原子核阻止的影响。研究表明，从费米能到的较大能量范围内，无论小质量体系还是大质量体系，原子核阻止对同位旋相关的核子－核子碰撞截面都非常灵敏，而不同模型给出的核密度分布对原子核阻止影响不大，说明原子核阻止作为提取同位旋相关核子－核子碰撞截面的灵敏探针是与原子核结构模型无关的。 Influence of densitydistributionwhichisgivenbyRMFandSkyrme－Hartrere－Fork etalnuclearstructuremodelonnuclearstoppinginheavy－ioncollisionsatintermediateenergiesarestudiedbyusingisospin－dependentquantummoleculardynamics(IQMD)model.ResearchshowsthatrangeformtheFermienergytothelargerenergyof 100 Mev/u, for bothsmallandlargemasssystem,nuclearstoppingisfoundtobestronglydependentonthenucleon－nucleoncrosssections,andweaklyondifferentdensitydistribution.ThisshowsthatnuclearstoppingcanbeusedasaprobetoextracttheinformationontheisospindependenceN－Ncrosssectionsandhasnorelationshipwithnuclearstructuremodels.

Influence of Density Distribution on Nuclear Stopping Isospin Effects

Influence of density distribution which is given by RMF and Skyrme-Hartrere-Fork et al.nuclear structure model on nuclear stopping in heavy-ion collisions at intermediate energies is studied by using isospin-dependent quantum molecular dynamics(IQMD) model.Research shows that in the range from the Fermi energy to the energy of 100 MeV/u,for both small and large mass system,nuclear stopping is found to be strongly dependent on the nucleon-nucleon cross sections,and weakly on different density distribution.This shows that nuclear stopping can be used as a probe to extract the information on the isospin dependence N-N cross sections and has no relationship with nuclear structure models.