Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hybrid potential/R-matrix models for the 12C + alpha system   I present ongoing developments on hybrid models which combine the potential
model, for the description of the background, with the R-matrix model, for the
description of discrete states. Physical parameters of discrete states are
converted into formal R-matrix parameters, taking into account the potential
background. The nuclear part of this potential is constructed by a new variant
of an inversion method based on supersymmetric quantum mechanics. The method is
illustrated on 12C + alpha S-wave elastic phase shifts.

13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
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
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph