标题:
重离子碰撞中K+介子的横动能谱Transverse Kinematical Energy Spectra of
K+ Mesons in Heavy Ion Collisions
作者:
邢永忠, 思李飒娃德.彭拉德, 郑玉明
关键字:
重离子碰撞, K产生, 横动能谱, 在介质中的K+位势, 核物态方程, 协变的K动力学, 量子分子动力学模型Heavy Ion Collisions, Kaon Production, The Transverse Kinematical Energy Spectra, The K+ In-Medium Potential, The Nuclear Equation of State, The Covariant Kaon Dynamics, The Quantum Molecular Dynamics Model
期刊名称:
《Modern Physics》, Vol.4 No.3, 2014-05-30
摘要:
本文采用基于协变的K动力学的量子分子动力学模型，研究了1.93 AGeV入射能量的58Ni + 58Ni碰撞中产生的K+介子的横动能谱，并讨论了K+介子在介质中的位势对其横动能谱的影响。理论计算显示，只有计入K+介子在核介质中的位势的效应，才能合理地描写KaoS的实验数据。这表明，我们能从K+介子横动能谱的分析中提取出在核介质中K+介子位势的信息。同时，我们发现，K+介子的横动能谱也是一个探测核物态方程的敏感的观测量。
We use the quantum molecular dynamics model based on the covariant kaon dynamics to investi- gate the transverse kinematical energy spectra of K+ mesons from 58Ni + 58Ni collisions at 1.93 AGeV, and discuss the influence of the K+ in-medium potential on its transverse kinematical energy spectrum. We observe that the KaoS data can only be reasonably described by calculated results with a repulsive K+N potential. This indicates that one can extract the information on the K+ in-medium potential in a nuclear medium from the analysis of the transverse kinematical energy spectra of K+ mesons. We find that the transverse kinematical energy spectrum of K+ mesons is also a sensitive observable to probe the nuclear equation of state.