1-5 Probing Nuclear Symmetry Energy by .= + Ratio below the Pion Production Threshold

• 作者: Yong Gaochan
• 来源期刊: 中国科学院近代物理研究所和兰州重离子研究装置年报：英文版
• 学科: 物理学
• 关键词: NUCLEAR SYMMETRY ENERGY
• 年，卷（期）: 2014,（1）
• 页码范围: 8-8
• 页数: 1页
• 分类号: O4

摘要

π-/π+ ratio was found to be a sensitive probe to the high-density behavior of the symmetry energy by usingseveral transport models. However, as shown in Fig. 1, at beam energies below the pion production threshold, theeffects of in-medium nucleon-nucleon scattering cross section (which is still controversial) strongly affect the valueof π??/π+ ratio[1]. It is thus necessary to do a comparative study of the effects of the in-medium NN cross sectionand the effects of the symmetry energy on pion production in heavy-ion collisions at lower beam energies.