Nuclear shell effect and collinear tripartition of nuclei
Abstract
A possibility of formation of the three reaction products having comparable masses at the spontaneous fission of 252Cf is theoretically explored. This work is aimed to study the mechanism leading to observation of the reaction products with masses M1=136---140 and M2=68---72 in coincidence by the FOBOS group in JINR. The same type of ternary fission decay has been observed in the reaction 235U(n th,fff). The potential energy surface for the ternary system forming a collinear nuclear chain is calculated for the wide range of mass and charge numbers of constituent nuclei. The results of the PES for the tripartition of 252Cf(sf,fff) shows, that we have favorable dynamical conditions for the formation of fragments with mass combinations of clusters 68-70Ni with 130-132Sn and with missing cluster 48-52Ca.
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