Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of three-neutron bound and continuum states   The three-neutron ($3n$) system is studied by numerical calculations with the
Faddeev three-body formalism for a realistic nucleon-nucleon (NN) potential. A
response function for the transition from ${}^3\mathrm{H}$ to $3n$ continuum
states by an isospin excitation operator is calculated, from which no evidence
of $3n$ resonance state is found. Different methods to extrapolate the $3n$
energy from bound state energies with an extra attractive effect to the NN
potential are examined. While extrapolations with attractive effects by
enhanced NN potentials or three-body potentials result the non-existence of
$3n$ resonance states, one by external trapping potentials leads to a positive
$3n$ energy, which may be considered as a resonance state. It is found that
this contradiction is due to a general defect of the trapping method.

32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
18
The categories of this paper are: econ