Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Secondary $\gamma$-ray decays from the partial-wave $T$ matrix with an
  $R$-matrix application to ${}^{15}{\rm N}(p,\alpha_1\gamma){}^{12}{\rm C}$   The secondary $\gamma$ rays emitted following a nuclear reaction are often
relatively straightforward to detect experimentally. Despite the large volume
of such data, a practical formalism for describing these $\gamma$ rays in terms
of partial-wave $T$-matrix elements has never been given. The partial-wave
formalism is applicable when $R$-matrix methods are used to describe the
reaction in question. This paper supplies the needed framework, and it is
demonstrated by the application to the ${}^{15}{\rm
N}(p,\alpha_1\gamma){}^{12}{\rm C}$ reaction.

21
The categories of this paper are: adap-org
2
The categories of this paper are: math
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn