Density effects in heavy ion charge-exchange processes in gaseous and solid targets

Experimental results on the pre-equilibrium and equilibrium charge distributions in celluloid films for incident Be, B, C, N, O ions are analyzed in order to obtain charge-exchange cross-sections. The determined 'effective' cross-sections of electron capture and loss in celluloid together with earlier measured analogous cross-sections in nitrogen allow us to calculate charge fractions Fi(t) depending on the target thickness in solid (celluloid) and gaseous (nitrogen) matter. The absolute values and the ratios Acap=σgi,i-1/σsi,i-1 and Aloss=σgi-1,i/σsi-1,i of electron capture and loss cross-sections in {s} solids (celluloid, carbon) and {g} gases (nitrogen) are under consideration