Fragments Scaling Phenomena And Chiral Magnetic Effect In Heavy-ion Collisions

The heavy-ion collisions are used to study the structure and properties of nuclear matter,and an isobaric yield ratio difference(IBD)method is proposed to study the ratio of the difference between the chemical potential of neutron and proton to temperature in heavy-ion collisions.It plays an important role in the differences in nuclear chemical potentials and the relationship between system uncertainties in research systems.The study of nuclear information in heavy ion collisions has always been a frontier issue in nuclear physics research.Compared to heavy-ion collisions,products after relativistic heavy ion collisions are even more microscopic,quark gluon plasma(QGP)can be generated in it,and the cornerstone of the CME is the quark gluon plasma.The study of the chiral magnetic effect is helpful to the study of the properties of the quark gluon plasma.The mechanism of the generation of the chiral magnetic effect is not known at present,and its research is a hot topic at home and abroad.The research on the chiral magnetic effect under the RHIC region has achieved breakthrough results,which has stimulated the interest in studying the chiral magnetic effect under the LHC energy region.Based on the background above,the main work involved in this thesis is two parts:(1)Explore the fragments scaling phenomenon in heavy-ion nuclear reactions.The specific work is as follows: First,the expression formula of IYR method is deduced by using the formula of fragments yield,and then the isobaric yield ratio method(IBD)is deduced on the basis of IYR method.The isobaric yield ratio method is mainly used to reflect the system uncertainty relationship in heavy ion nuclear reactions.We apply it to projectile fragmentation,spallation and fission.And the results shows that three kinds of nuclear reaction mechanisms all have a good scaling phenomena.(2)Using the multiphase transport model(AMPT)to study the chiral magnetic effect.Relativistic heavy-ion collisions provide conditions for the study of quark characteristics,because it produces a quark gluon plasma resulting from deconfinement.The study of the chiral magnetic effect is closely related to the properties of the quark-gluon plasma and maps the properties of the QCD phase transition.The study used the multiphase transport model to analyze the chiral magnetic effect under LHC energy region.In this thesis,the CME effect of the 2.76 TeV Pb+Pb in the ALICE experimental group was simulated,and anexploratory study was conducted on the relationship between the magnetic effect and the dependence of the quark taste.