Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Demonstration of Single Barium Ion Sensitivity for Neutrinoless Double
  Beta Decay using Single Molecule Fluorescence Imaging   A new method to tag the barium daughter in the double beta decay of
$^{136}$Xe is reported. Using the technique of single molecule fluorescent
imaging (SMFI), individual barium dication (Ba$^{++}$) resolution at a
transparent scanning surface has been demonstrated. A single-step photo-bleach
confirms the single ion interpretation. Individual ions are localized with
super-resolution ($\sim$2~nm), and detected with a statistical significance of
12.9~$\sigma$ over backgrounds. This lays the foundation for a new and
potentially background-free neutrinoless double beta decay technology, based on
SMFI coupled to high pressure xenon gas time projection chambers.

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The categories of this paper are: acc-phys
2
The categories of this paper are: math
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom