Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simulation of $^{67}$Cu photo-nuclear production in nanoparticles   The process of $^{67}$Cu nuclide photoproduction in the zinc dioxide
nanoparticles immersed in the water media was simulated. We calculated the
escape fractions of $^{67}$Cu nuclei and corresponding ranges in water for
nanoparticle sizes from 40 nm to 80 nm and incident photons energies from 12
MeV to 30 MeV. Usage of capturing nanoparticles for accumulation of the escaped
$^{67}$Cu nuclei is also discussed.

32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys