摘要
采用ImQMD05模型分析了非对称反应体系^(40)Ar+^(197)Au,^(124)Sn在中低能区(Ebeam=35~100Me V/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10Me V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 Im QMD05 code, we simulate the ^40Ar+^197Au,^124Sn at beam energy of 35, 50 and100 Me V/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 Ek 10 MeV.
出处
《原子核物理评论》
CAS
CSCD
北大核心
2016年第3期251-257,共7页
Nuclear Physics Review
基金
国家自然科学基金资助项目(11475262
11275052
11422548
11375062
11375094
11365004)
国家重点基础研究发展计划项目(973计划)(2013CB834404)~~
关键词
对称能
重离子碰撞
并合不变产额
角分布的各向异性
非对称反应体系
symmetry energy
heavy ion collision
anisotropy of angular distribution
coalescence invariant yield
asymmetry reaction system