共振粒子的化学势和粒密度、能密度  

Chemical Potential of Resonance Matter and Particle Density, Energy Density

作　　者：胡守扬[1] 傅元勇[1] 陆中道[1] 

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《高能物理与核物理》2005年第5期472-475,共4页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10275096;19975075)资助~~

摘　　要：研究了相对论重离子碰撞中产生的共振物质的统计性质,讨论了共振粒子的化学势和净粒子密度的关系.计算了总粒子密度和能量密度,研究和分析了他们和净粒子密度的关系,并估算了总粒子密度相对于正常核密度(0.16fm-3)的倍数;在RHIC能量约为5—8倍,在SPS能量约为3—6倍.还研究了各种粒子成分随温度的变化,揭示出几个温度区间段对应AGS,SPS和RHIC 3 个能区,各区间中主要粒子成分分别为重子、奇异子和介子.The statistical property is studied for the resonance matter produced in relativistic heavy-ion collision. The relation between chemical potential of the resonant particle and net particle density is discussed. The total particle density and the energy density are calculated, and the relations between these densities and the net baryon density are analyzed. The ratio of the total particle density to the normal nuclear density(0.16 fm)is estimated. It is about 5-8 in RHIC energy region and 3-6 in the SPS energy region. Finally, the character of the hadronic component at different regions is studied. It is found that in three temperature regions which correspond to the ACS, SPS and RHIC energy region, respectively, the main hadronic component is baryon, strange particle and meson, respectively.

关 键 词：共振粒子 化学势 粒密度 能密度 奇异子 重子 介子 

分 类 号：O572.2[理学—粒子物理与原子核物理]