Study On Cross-sections Of Nuclear Reactions Induced By Heavy Ions With Intermediate And High Energy

The study of the interaction mechanism of nuclear reactions induced by medium and high energy heavy ions can provide important scientific value for the origin and propagation of cosmic rays in astrophysics,the study of radiation damage in deep space and space space,the study of cancer treatment and radiation-related biological effects of heavy ions.In this paper,the total charge-changing cross sections,the partial charge changing cross sections and charge-pickup cross sections of the nuclear reaction induced by medium and high energy heavy ions are systematically analyzed,which provides data support for the modeling of nucleon-nucleus collision.Experiment,high energy nuclear-nuclear collision process,relativistic energy of the projectile on the target,center collision,edge collision happens and electromagnetic dissociation three categories,including edge collision involving two kinds of reaction mechanism,a class of the projectile charge loss,to generate a variety of categories of projectile fragments,the reaction probability by charge change points section;The other is that the projectile charge increases by a small amount,usually by one charge,but rarely by two,and the reaction probability is expressed by charge pickup cross section.Both of these reactions are peripheral collisions,which can provide suggestions for understanding certain aspects of nuclear structure,the origin and composition of cosmic rays in astrophysics,the passage of heavy nuclei through the interstellar medium,and considerations of the side effects of heavy ions on cancer treatment.In this paper,the total charge-changing cross sections and the partial charge changing cross sections of CH2,C,Al,Cu and Pb targets with the highest energy of 495A MeV 40Ar are studied for the first time by using CR-39 solid nuclear track detector.The study is based on the analysis of the dependence of the total and partial charge changing cross sections of intermediate and high energy heavy ion on projectile,target nucleus,charge change and energy.The total cross sections showed no obvious energy dependence.However,it increased with the increase of target mass.The cross sections of partial charge changing decreases regularly with the increase of charge loss,and shows obvious dependence on the target nucleus mass.The partial cross sections increases with the increase of the target nucleus mass.The experimental data of other experimental groups are compared,and the overall trend is consistent with other studies.In this paper,the experimental results are compared with some parameterized models,including Cummings model,Nilsen model,EPAX3 and FRACS.It is found that the consistency of data with EPAX3 is better.The energy dependence of the cross sections for fragments with small charge change is analyzed.Except for Pb target,the cross sections for fragments with small charge loss decreases with the increase of energy.In this paper,the dependence of charge pickup reaction cross section on energy,mass of projectile nucleus and mass of target nucleus is systematically analyzed.Based on that,the charge-pickup cross sections of 40Ar with the highest energy of 495MeV/n and 12C with the highest energy of 398Mev/n on C,CH2,Al,Cu and Pb targets were studied by using CR-39 solid state nuclear track detector in the HIMAC energy region for the first time.The measured data were fitted with the power-law function σΔZ=+1=aATb and linear functionσΔZ=+1=α+βAT,respectively.b was fitted between 0.81 and 0.94,and the charge pickup cross section is linearly dependent on the target mass AT.