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The existence of a new type of cluster decay called "collinear clustertri-partition" (CCT) is discussed by an analysis of the landscape of thepotential energy surface (PES). The total energy of the ternary system is foundas a sum the binding energies of fragments and nucleus-nucleus interactionbetween them. The pre-scission state of the ternary system is assumed to bearranged as a chain of the three fragments along a straight line. Minima andvalleys of the PES are determined by variation of the proton and neutrondistributions between them. Pre-scission prompt emission of neutrons is assumedand PES is calculated for the cases of emission of 2---4 neutrons. The presenceof the valley corresponding to the formation of the isotopes of Sn with masses$A$=130---136 is inherent for all PES calculated for CCT for spontaneousfission of $^{252}$Cf and fission induced by neutrons of $^{235}$U. There arelocal minima indicating the formation of Ca, Fe, Ni, Ge and Se isotopes havingmagic proton or/and neutron numbers, such as 20, 28, and 50. The analysis showsthat the experimentally observed $^{68}$Ni is formed as the edge fragment ofthe ternary system connecting to Sn by Si and Ca isotopes at fission of$^{236}$U and $^{252}$Cf, respectively.

Peculiarities of clusters formation in true ternary fission of $^{252}$Cf and $^{236}$U$^*$