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Report No.
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Introduction of particle transport code PHITS and analytical model for estimating the atmospheric cosmic-ray spectra PARMA

Abe, Shinichiro; Sato, Tatsuhiko

Some researchers actively investigate secondary cosmic-ray muon radiography for imaging of large structures, detecting nuclear matter, and so on. The simulation is one of effective methods to estimate the required time for muon radiography or to optimize detection system. In this report, we introduce particle transport code PHITS and analytical model for estimating the atmospheric cosmic-ray spectra PARMA. Benchmark results are also shown. PHITS describes intensities of terrestrial muons in the ground well. PHITS also shows good agreement with measured data for particle generations from several interactions between muon and material. These results indicate the practicability of PHITS for simulation of muon radiography. PARMA reproduces cosmic-ray spectra on several spots well. Excellent agreement is seen between the measurements and PARMA for muon fluxes with large zenith angles and high energies, which are important for muon radiography.

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