Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Peculiarities of clusters formation in true ternary fission of
  $^{252}$Cf and $^{236}$U$^*$   The existence of a new type of cluster decay called "collinear cluster
tri-partition" (CCT) is discussed by an analysis of the landscape of the
potential energy surface (PES). The total energy of the ternary system is found
as a sum the binding energies of fragments and nucleus-nucleus interaction
between them. The pre-scission state of the ternary system is assumed to be
arranged as a chain of the three fragments along a straight line. Minima and
valleys of the PES are determined by variation of the proton and neutron
distributions between them. Pre-scission prompt emission of neutrons is assumed
and PES is calculated for the cases of emission of 2---4 neutrons. The presence
of 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 spontaneous
fission of $^{252}$Cf and fission induced by neutrons of $^{235}$U. There are
local minima indicating the formation of Ca, Fe, Ni, Ge and Se isotopes having
magic proton or/and neutron numbers, such as 20, 28, and 50. The analysis shows
that the experimentally observed $^{68}$Ni is formed as the edge fragment of
the ternary system connecting to Sn by Si and Ca isotopes at fission of
$^{236}$U and $^{252}$Cf, respectively.

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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: astro-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg