arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0812.2806nucl-th
收藏

重离子碰撞中的高密度对称能

The High-Density Symmetry Energy in Heavy Ion Collisions

H. H. Wolter, V. Prassa, G. A. Lalazissis, T. Gaitanos, G. Ferini, V. Greco, M. Di Toro

摘要:

核对称能作为密度的函数在理论上和实验上都受到很差的约束,在饱和密度以下,特别是在高密度下,相关的实验数据很少。我们讨论的观测值,可以产生关于这个问题的信息,特别是,质子-中子流的差异,并在相对论性重离子碰撞的π介子和K介子的生产。对于介子的产生,我们特别研究了相应的同位旋伙伴$π^-/π^+$和$K^0/K^+$的比例,我们发现,K介子是一个有趣的探针的对称性能量。在这种情况下,我们还讨论了各种选择对K介子势或介质有效质量的影响。

英文摘要:

The nuclear symmetry energy as a function of density is rather poorly constrained theoretically and experimentally both below saturation density, but particularly at high density, where very few relevant experimental data exist. We discuss observables which could yield information on this question, in particular, proton-neutron flow differences, and the production of pions and kaons in relativistic heavy ion collisions. For the meson production we investigate particularly ratios of the corresponding isospin partners $π^-/π^+$ and $K^0/K^+$, where we find that the kaons are an interesting probe to the symmetry energy. In this case we also discuss the influnece of various choices for the kaon potentials or in-medium effective masses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑