中高能重离子碰撞中奇异粒子产生和超核研究进展  

Progress in strange particle production and hypernuclear physics in intermediate and high-energy heavy-ion collisions

作　　者：冯兆庆 刘恒金 程辉淦 韦斯纳 FENG Zhaoqing;LIU Hengjin;CHENG Huigan;WEI Sina(School of Physics and Optoelectronics,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学物理与光电学院,广州510641

出　　处：《核技术》2023年第8期96-106,共11页Nuclear Techniques

基　　金：国家自然科学基金(No.12175072,No.11722546);华南理工大学双一流建设经费(No.20210115)资助。

摘　　要：本文概述了中高能重离子碰撞奇异粒子产生动力学机制和超核实验测量和理论研究进展。基于量子分子动力学(Lanzhou Quantum Molecular Dynamics model,LQMD)输运模型,即引入Skyrme能量密度泛函和相对论协变密度泛函描述核子和共振态动力学演化,考虑介子-核子和超子-核子相互作用势和阈能修正效应。以反应系统^(12)C+^(12)C、^(40)Ca+^(40)Ca、^(112)Sn+^(112)Sn和^(197)Au+^(197)Au为例,研究了阈能附近K介子、Kˉ介子和超子(Λ、Σ、Ξ)产生机制并分析了核介质效应和高密区域对称能对同位旋粒子比值的影响。基于量子并合方法构造超核并研究了超核形成相空间分布,给出超核形成的质量数、电荷数、动能、快度分布、集体流等信息。引入两体、三体、四体核子碰撞和核结构效应分析了重离子碰撞中预平衡结团发射机制。介绍了考虑同位旋矢量介子ρ和δ耦合相对论协变的量子分子动力学输运模型。We reviewed the recent progress on strange particle production and hypernuclear physics both in experiments and in theories.The temporal evolutions of nucleons and resonances are described by the Skyrme energy density functional and relativistic covariant density functional theory,in which the meson-nucleon and hyperonnucleon interactions are considered.Calculations are performed for the reactions of ^(12)C+^(12)C、^(40)Ca+^(40)Ca、^(112)Sn+^(112)Sn,and ^(197)Au+^(197)Au.The in-medium effects and high-density symmetry energy from the production of kaon,antikaon,and hyperon(Λ,Σ,Ξ)are investigated systematically.A quantum coalescence method is used to construct the hypernucleus,and the phase-space distribution is investigated in terms of the mass,charge,kinetic energy,rapidity distribution,collective flows,etc.Pre-equilibrium cluster emission in heavy-ion collisions is analyzed by implementing 2-,3-,and 4-body nucleon collisions.The relativistic quantum molecular dynamics model is introduced by includingρandδcoupling for nucleon transportation,and the collective flows are calculated for protons and neutrons.

关 键 词：重离子碰撞 奇异粒子产生 介质效应 并合方法 LQMD输运模型 

分 类 号：TL99[核科学技术—核技术及应用]