  The cold ternary fission of $^{238}$Pu, $^{240}$Pu, $^{242}$Pu and $^{244}$Pu
isotopes, with $^{4}$He as light charged particle, in equatorial and collinear
configuration has been studied within the Unified ternary fission model (UTFM).
The fragment combination $^{100}$Zr+$^{4}$He+$^{134}$Te possessing the near
doubly magic nuclei $^{134}$Te (N=82, Z=52) gives the highest yield in the
alpha accompanied ternary fission of $^{238}$Pu. For the alpha accompanied
ternary fission of $^{240}$Pu, $^{242}$Pu and $^{244}$Pu isotopes, the highest
yield was found for the fragment combination with doubly magic nuclei
$^{132}$Sn (N=82, Z=50) as the heavier fragment. The deformation and
orientation of fragments have also been taken into account for the alpha
accompanied ternary fission of $^{238-244}$Pu isotopes, and it has been found
that in addition to closed shell effect, ground state deformation also plays an
important role in determining the isotopic yield in the ternary fission
process. The emission probability and kinetic energy of long range alpha
particles have been calculated and are found to be in good agreement with the
experimental data.
