  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.
