We have analyzed cold fusion reactions, especially, (HI(Heavy‐Ion), xn) reactions with208Pb target series. The ratio af/anused in the statistical model is determined by fitting experimental data of &Ggr;n/&Ggr;totalforZ=102 and the extrapolative use is made forZ>103. Theoretical predictions for excitation functions in208Pb(50Ti,51V,54Cr,55Mn,58Fe,59Co,65Cu,70Zn, xn) reactions are compared with experiments. We found that peak positions of (HI, xn) reactions except for the sub‐barrier fusion enhancement effect stay almost constant when we increase theZ‐number of compound nucleus fromZ=104 toZ=110. © 2004 American Institute of Physics