论文标题
等素阻断及其在重离子碰撞中的影响
Isospin blocking and its effects in heavy-ion collisions
论文作者
论文摘要
在重型离子碰撞过程中的同胞扩散过程中，\ emph {isospin封锁}的概念被提高。通常，在同胞素扩散的过程中，同种不对称会从该位置扩散，并以较大的不对称性向该位置散布。但是，我们的研究表明，如果对称能的局部值更大，则可以阻止同胞素扩散。我们将这种现象称为``Isospin obsing''。为了检查这种行为，在同位素依赖性的Boltzmann-uehling-uhlenbeck（Ibuu）转运模型的框架内，研究了同位素SN+SN反应中270 MEV/nucleon的同位素扩散。结果表明，如果局部对称能量很大，则延伸后不对称的值明显被阻断。证明了同胞素阻断对稀释和致密物质的异种不对称性以及重离子碰撞中的最终$π^ - /π^+$比率的影响。
A concept of \emph{isospin blocking} in the process of isospin diffusion in heavy-ion collisions is raised. Generally, in the process of isospin diffusion, isospin asymmetry would diffuse from the place with large asymmetry to the place with small asymmetry. However, our study shows that the isospin diffusion could be blocked in case the local value of the symmetry energy is larger. We dub this phenomenon ``isospin blocking''. To check this behavior, in the framework of an Isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model, isospin diffusions in the isotope Sn+Sn reactions at 270 MeV/nucleon are studied. It is shown that the value of the after-diffusion asymmetry is distinctly blocked if the local symmetry energy is large. The effects of the isospin blocking on the isospin asymmetry of dilute and dense matter and the final $π^-/π^+$ ratio in heavy ion collisions are demonstrated.
