并合不变中子质子产额比值角分布各向异性与对称能关系的研究

吴强华; 张英逊; 肖志刚; 王仁仲; 张嫣; 李祝霞; 王宁

doi:10.11804/NuclPhysRev.33.03.251

并合不变中子质子产额比值角分布各向异性与对称能关系的研究

Relation Between the Angular Anisotropy of Coalescence Invariant Neutron to Proton Ratio and the Symmetry Energy in Asymmetric Heavy Ion Collisions

摘要

摘要: 采用ImQMD05模型分析了非对称反应体系⁴⁰Ar+¹⁹⁷Au，¹²⁴Sn在中低能区（E_beam=35~100 MeV/u）的半擦边反应的条件下的反应机制，并进一步探索了不同模型参数，如对称能斜率、碰撞参数等，对轻粒子并合不变中子质子产额之比角分布各向异性的影响。通过研究发现：对于出射动能大于每核子10 MeV的动力学出射的轻粒子而言，其并合不变的中子质子产额比值角分布各向异性与对称能的软硬具有明显的关联；碰撞参数对轻粒子动力学发射各向异性的影响最弱。

By using the ImQMD05 code,we simulate the ⁴⁰Ar+¹⁹⁷Au,+¹²⁴Sn at beam energy of 35,50 and 100 MeV/u and semi-peripheral collisions.The reaction mechanism,symmetry potential and Coulomb potential competition around the overlapped neck region and impact parameters effects are investigated for understanding the angular distribution of isospin contents of dynamical emitted light particles.Our results show that the angular anisotropy of the coalescence invariant neutron to proton yield ratios is sensitive to the stiffness of symmetry energy,especially for the dynamical emitted light particles with E_k>10 MeV.

Abstract: By using the ImQMD05 code,we simulate the ⁴⁰Ar+¹⁹⁷Au,+¹²⁴Sn at beam energy of 35,50 and 100 MeV/u and semi-peripheral collisions.The reaction mechanism,symmetry potential and Coulomb potential competition around the overlapped neck region and impact parameters effects are investigated for understanding the angular distribution of isospin contents of dynamical emitted light particles.Our results show that the angular anisotropy of the coalescence invariant neutron to proton yield ratios is sensitive to the stiffness of symmetry energy,especially for the dynamical emitted light particles with E_k>10 MeV.

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