The Collective Flow Of Kaon Mesons In Heavy-ion Collisions At Intermediate Energies

The nuclear matter equation of state?EOS?is crucial for understanding many phenomena in the nuclear structure and reaction and it has been the hot topic of discussion among researchers in the field of nuclear physics.The generation of the kaon mesons in heavy ion collisions at intermediate energies is one of the important ways to study the nature of the formation of high density nuclear species in nuclear reactions.The transport model can simulate the whole environment and process of heavy-ion collisions.The related properties of high density nuclear matter can be extracted back combined with the simulation results of transport model and the experimental measurements.In this paper,it firstly introduced the research background and research significance of heavy-ion collisions at home and abroad.The initialization,mean field and several important stages of two-body collision of the modified ultra-relativistic quantum molecular dynamics?UrQMD?model based on quantum molecular dynamics?QMD?model are analyzed in detail.Secondly,in the UrQMD model which has introduced the kaon-nucleon?KN potential?,the spatial component of the vector field of kaon mesons?the movement of the kaon mesons and the surrounding nucleon?Lorentz Force is introduced again,and the introduction process is deduced in detail.With the latest ultra relativistic quantum molecular dynamics?UrQMD?model,it studied the Au+Au collisions(E_lab?28?5.1or 0.2GeV/nucleon)at intermediate energies as an example.The influence of heavy-ion collision on the direct current,elliptic current and azimuth distribution of kaon mesons is investigated without considering KN potential,only considering KN potential and considering KN potential and Lorentz Force.The research results show that the KN potential makes the kaon mesons and the nucleon mutually exclusive,which producing a direct flow in the opposite direction to the nucleon,while Lorentz Force can provide an attractive force to pull it back to the nucleus.and it reproduced the relevant data of the direct flow batter;The relative data of elliptic flow also reverse change after introducing Lorentz force.By modifying the Lorentz Force in the transport model,the calculated results of elliptic flow are in better agreement with experimental data;By comparing the azimuth distribution of kaon meson collective flow with KaoS experimental data,it's showed that the rationality of introducing kaon mesons and nucleon interaction potential?KN potential?and Lorentz Force.