Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new study of $^{25}$Mg($\alpha$,n)$^{28}$Si angular distributions at
  $E_\alpha$ = 3 - 5 MeV   The observation of $^{26}$Al gives us the proof of active nucleosynthesis in
the Milky Way. However the identification of the main producers of $^{26}$Al is
still a matter of debate. Many sites have been proposed, but our poor knowledge
of the nuclear processes involved introduces high uncertainties. In particular,
the limited accuracy on the $^{25}$Mg($\alpha$,n)$^{28}$Si reaction cross
section has been identified as the main source of nuclear uncertainty in the
production of $^{26}$Al in C/Ne explosive burning in massive stars, which has
been suggested to be the main source of $^{26}$Al in the Galaxy. We studied
this reaction through neutron spectroscopy at the CN Van de Graaff accelerator
of the Legnaro National Laboratories. Thanks to this technique we are able to
discriminate the ($\alpha$,n) events from possible contamination arising from
parasitic reactions. In particular, we measured the neutron angular
distributions at 5 different beam energies (between 3 and 5 MeV) in the
\ang{17.5}-\ang{106} laboratory system angular range. The presented results
disagree with the assumptions introduced in the analysis of a previous
experiment.

36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
2
The categories of this paper are: math
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
16
The categories of this paper are: stat