New statistical approach to the systematization on heavy-nuclei fission fragment

It is shown that the mass distribution of the heavy-nuclei fission fragments is defined by the probability of occurrence of the final state of nuclear fragments and the initial nuclear temperature. The data on fission fragments mass distribution are presented for the /sup 232/Th, /sup 208 Pb and /sup 227/Ac nuclei. Anisotropy of the fragment masses distribution (FMD)in heavy nuclei is one the fundamental problems of the nuclear matter stability. As a rule, the FMD peculiarities are explained within the framework of model in which the final fragment mass or charge ratios are interpreted as those resulted from the dynamics of decay ore the potential relief features at heavy nuclei fission. Recently, the mass-channel theory has been applied to elucidate the FMD fine structure, being the heavy nuclei cluster model generalization. This approach allows one to clarity the fact that the nuclear fragments with closed proton and neutron shells are the domination fission products. The theory suggested some different assumptions: FMD is defined by the probability of occurrence of the final state of nuclear fragments and the initial nuclear temperature. The theory starts with some assumptions. (author)