Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical properties of YAG:Ce and GGG:Ce scintillation crystals
  irradiated with a high fluence proton beam   In this paper, we report on the study of the optical properties of YAG:Ce and
GGG:Ce garnet crystals after irradiation in a 660~MeV proton beam with a
fluence up to 8.9$\times$10$^{14}$ protons/cm$^2$. We found that the
transparency of both crystals fell by no more than 7\% in the region of their
own luminescence. The light yield of a YAG:Ce sample, measured one year after
irradiation, dropped by about 35\%.

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The categories of this paper are: q-alg
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The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: math
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The categories of this paper are: q-bio