Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $\mathbf{\alpha}$-induced reaction cross sections in the mass range
  $\mathbf{A \approx 20 - 50}$: a critical review   In a recent review it was shown that the cross sections of $\alpha$-induced
reactions in the $A \approx 20 - 50$ mass range follow a general and smooth
trend in most cases. For comparison of cross sections of different targets at
various energies the method of reduced cross sections $\sigma_{\rm{red}}$ and
reduced energies $E_{\rm{red}}$ was used. Four outliers were identified:
$^{36}$Ar and $^{40}$Ar with unusally small cross sections and $^{23}$Na and
$^{33}$S with unusually large cross sections. New data for $^{23}$Na were
presented at this NPA-7 conference; contrary to the previous data, these new
data fit into the general systematics. In addition, a relation between the most
effective energy $E_0$ for astrophysical reaction rates (the so-called Gamow
window) and the reduced energy $E_{\rm{red}}$ is presented.

35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci