Measurement Of L-subshell X-ray Production Cross Section Of Tantalum And Aurum By Heavy Charged Ions Bombardment

The L-shell X-rays of tantalum by collision of 20～55 MeV F⁵⁺ions and 20～45 MeV O⁵⁺ions,as well as the L-shell X-rays of aurum by collision of 20～50 MeV C⁴⁺ ions,were measured on the HI-13 Tandem Accelerator at CIAE.Relative production cross sections of tantalum L-shell and L-subshell x-rays,along with absolute cross production sections of aurum L-shell and L-subshell x-rays,were calculated according to the experimental data.On the other hand,we obtained the values of ionization cross sections by using the plane-wave Born approximation(PWBA)and ECPSSR theoretical models,and then transformed them into the values of L-subshell X-ray production cross sections,by using the radiative transition probability,Coster-Kroning transition probability,and fluorescence yield.After that,the theoretical predictions were compared with the experimental results. The experimental data ofσ(L₁)/σ(L_α),σ(L_γ)/σ(L_α),andσ(L_total)/σ(L_α)for Ta have a reasonable agreement with theoretical predictions.But the value ofσ(L_β)/σ(L_α)is smaller than both PWBA and ECPSSR predictions.Furthermore,a good agreement between experiment data and theoretical predictions ofσ(L₁),σ(L_α),(L_β),σ(L_γ) andσ(L_total)for Au is observed.