摘要
用ＲＢＵＵ方法研究了中高能重离子碰撞中Ｋ－介子产额及谱的情况．我们发现 Ｋ＋／Ｋ－产额比是与核系统大小相关的，这种相关性与 Ｋ－介子在核介质中所受的吸收效应有关．还研究了在三种不同核系统中的Ｋ平均吸收路程，发现Ｋ－平均吸收路程在轻核系统中与在中、重核系统中存在较大的差别，从而定量地解释了这种 Ｋ＋／Ｋ－比与核系统的相关性．研究结果给出了核介质对 Ｋ－介子的吸收程度还与不同反应道的贡献有关，这是导致Ｂπ→Ｋ－Ｘ道在核系统，特别是在轻、中量核系统中起重要作用的一个重要原因。
We have investigated the yield and the spectrum of the K^- mesons in the heavy-ion collisions with the relativistic RBUU approach. It's found that the ratio of the yield of K^+ to K^- depends on the size of the nuclear systems. One main reason is caused by the absorption effect of the K^- mesons in the nuclear medium. We have found that the mean-absorption path of the K^- mesons are different for light nuclear system and for the middle or heavy nuclear systems. The extent of the absorption of K- mesons is different for different elementary production channels. It's one important reason to make the channel B-K^-X play an important role in the K-production, especially for light and middle systems.
出处
《高能物理与核物理》
SCIE
EI
CAS
CSCD
北大核心
2000年第1期49-59,共11页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金!19675069
关键词
重离子碰撞
K^-介子
吸收
heavy-ion collisions, K^- mesons, absorption
