Measurement of doubly-differential ionization cross section in fission fragments -He collision

In this work we present doubly-differential ionization cross section in fission fragments - He collisions, measured for electron ejection angles 30 deg, 45 deg, 60 deg and 90 deg and electron energy range from 10 eV to 1500 eV. Gas target is He atom jet and fission fragment source is 252Cf layer. Cross sections are measured in time-of-flight technique. The experimental results are compared with Gryzinsky's theory predictions. Comparison indicates on quality agreement with theory, but total ionization cross sections are in a good agreement with theory. We are calculated ionization energy loss by fission fragments in ff-He collisions. The calculated ionization energy loss values based on experimental data are about 45% of full electronic energy loss for fission fragments in He for the projectile energy ∼ 1 MeV/amu. 24 refs.; 11 figs