1-3 Nuclear Fragmentation Induced by Pions at theΔ-resonance Energies

• 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: 工学
• 关键词: transport QUANTUM NUCLEUS GEMINI part PAST HELP code
• 年，卷（期）: 2016,（1）
• 页码范围: 6-7
• 页数: 2页
• 分类号: TP393.09

摘要

The pion dynamics is of importance in understanding the transportation process in heavy-ion collisions and in hadron induced reactions,which also contributes other particle production as the main reaction channels,such as eta,strange particles,etc.Pion production in heavy-ion collisions near threshold energies has been investigated for extracting the high-density behavior of the nuclear symmetry energy(isospin asymmetric part of equation of state).The dynamics of pions produced in heavy-ion collisions is complicated,which is related to the pion-nucleon andΔ(1232)-nucleon interactions,the decay of resonances,etc.The in-medium properties of pion andΔ(1232)are not well understood up to now,which are related the isospin effects.In the past four decades,the pion-nucleus collisions at theΔ-resonance energies have been extensively investigated within the meson factories in the world.In this work,the Lanzhou quantum molecular dynamics(LQMD)model is used to investigate the nuclear dynamics induced by pions in theΔ-resonance region.The energy deposition in a nucleus by pion induced reactions is realized via the pion-nucleon collisions associated with the resonance production and reabsorption,which leads to the formation of highly excited nucleus.The fragmentation reactions induced by pions are described with the help of the LQMD transport model combined with the GEMINI statistical decay code for excited fragments[1].