Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scaling of Laser Produced Pair Plasmas And Comparison With Experimental
  Data   We report simulation results of pair production by ultra-intense lasers
irradiating a gold target using the GEANT4 Monte-Carlo code. Certain
experimental features of the positron and electron energy spectra are
reproduced, as well as trends with regard to target thickness and hot electron
temperature Te. For Te in the range 5-10 MeV, the optimal target thickness for
pair production is found to be about 3 mm. Further Monte-Carlo simulations may
aid in the optimization of laser-driven positron sources.

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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: hep-ph
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: hep-lat