  In this paper an attempt was to measure, the excitation functions of
$^{169}$Tm($^{12}$C, 4n)$^{177}$Re, $^{169}$Tm($^{12}$C, 5n)$^{176}$Re,
$^{169}$Tm($^{12}$C, $\alpha$n)$^{176}$Ta, $^{169}$Tm($^{12}$C,
$\alpha$2n)$^{175}$Ta , $^{169}$Tm($^{12}$C, $\alpha$3n)$^{174}$Ta ,
$^{169}$Tm($^{12}$C, $\alpha$4n)$^{173}$Ta, and $^{169}$Tm($^{12}$C,
2$\alpha$2n)$^{171}$Lu reaction channels populated in the interaction of
$^{12}$C projectile with $^{169}$Tm target were considered in order to
investigate the mechanisms of complete and incomplete fusion reactions. The
theoretically predicted excitation functions using PACE4 code were compared
with the previously measured excitation functions. For non alpha emitting
channels cross section values predicted by PACE4 in general were found to be in
good agreement with the experimentally measured values. However, for
alpha-emitting channels the measured cross-section values were found to be
higher than the values predicted by PACE4. The observed disagreement may be
credited to projectile break up in the vicinity of nn interaction. Keywords:
alpha emitted, CF reaction, excitation functions, heavy ion fusion, incomplete
fusion reaction, non alpha emitted
