Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Alkali ion-to-neutral atom converter for the magneto-optical trap of a
  radioactive isotope   We have developed a unique neutralizer device that uses an yttrium target
surrounded by a platinum wall to magneto-optically trap radioactive atoms. In
general, the radioactive nucleus produced in a nuclear reaction is extracted
and transported in ion form. For the magneto-optical trap, thermal
neutralization must occur on the surface of a metal with a small work function.
The converter can produce a neutral atomic beam with small angular divergence
that, given the recycling of atoms and ions, converts ions into neutral atoms
with remarkable efficiency. We demonstrated the ion neutralization process
using stable rubidium and confirmed $10^6$ neutralized atoms in the
magneto-optical trap. Additionally, the experiment using francium demonstrated
the obtaining of neutralized francium atoms.

15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
17
The categories of this paper are: q-fin