Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Internal clusterization in the Coulomb few-body systems and stability of
  the five- and six-body systems with unit charges   Stability of the bound ground states in the six five-body muonic $a b \mu
e_2$ ions (or $(a b \mu e_2)^{-}$) and ten six-body $a b c \mu e_2$
quasi-molecules is investigated. The notations $a, b, c$ stand for the bare
nuclei of three hydrogen isotopes - protium ($p$), deuterium ($d$) and tritium
($t$). All these systems are the Coulomb five- and six-body systems with unit
charges. It is found that the ground bound $S(L = 0)-$states are stable in all
six five-body $a b \mu e_2$ ions and in ten six-body $a b c \mu e_2$
quasi-molecules. As follows from accurate variational computations of the
five-body $a b \mu e_2$ ions their internal structure is similar to the
internal structure of the negatively charged hydrogen ion H$^{-}$. Analogously,
we show that the internal structures of the six-body neutral $a b c \mu e_2$
quasi-molecules are similar to the structure of the two-center H$_{2}$ molecule
which contains two heavy hydrogen nuclei and two bound electrons.

22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an