Relation of shell structure of fissile nuclei to half-life of spontaneous fission and fragment mass distribution

A hypothesis is proposed, according to which the fission of nuclear matter at the initial stage of nucleus fission occurs in such a way which preserves in the producing fragments the type of shell structure common to the initial nucleus. It follows from the hypothesis, that the hypotetic superheavy nuclei constituting ''stability region'' near the closed spherical shells z=114, N=184, should fission mainly to dence fragments with 208-210 and 88-90 masses, resulted from the proximity of spherical shells z=82, N=126 and z=28 (or 32), N=50