Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A variety of clustering in $^{18}$O   We investigate excited states of $^{18}$O by using the antisymmetrized
molecular dynamics. It is found that five different types of cluster states
exist which we call ${}^{14}{\rm C}+\alpha$, higher-nodal ${}^{14}{\rm
C}+\alpha$, two molecular states, and $4\alpha$ linear-chain. The calculated
$\alpha$-decay widths are compared with the observed data. The higher-nodal
${}^{14}{\rm C}+\alpha$ cluster states reasonably agree with resonances
reported by the recent experiments. We predict that the $\alpha$-particle
emission is dominant for the ${}^{14}{\rm C}+\alpha$ cluster states while the
molecular states prefer the $^{6}$He emission.

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The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat