Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Calculation of the spectrum of 12Li by using the multistep shell model
  method in the complex energy plane   The unbound nucleus $^{12}$Li is evaluated by using the multistep shell model
in the complex energy plane assuming that the spectrum is determined by the
motion of three neutrons outside the $^9$Li core. It is found that the ground
state of this system consists of an antibound $1/2^+$ state and that only this
and a $1/2^-$ and a $5/2^+$ excited states are physically meaningful
resonances.

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The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics