Energy Spectrum of Ultra-High Energy Cosmic Rays with Extra-Galactic Origin : Astrophysics and Relativity

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概要

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• We carried out a numerical calculation for the propagation of ultra-high energy cosmic ray nucleons in the intergalactic space by a Monte-Carlo method. The resulting energy spectrum above 10^<18> eV is modified by the interaction of nucleons with the micro wave background (MWB) photons, forming a bump and a cutoff, with position depending on the propagation distance and source distribution. It is found that the treatment of the evolution of the universe and the interactions between cosmic rays and MWB photons is crucial. We also calculated the spectra of neutrinos and gamma rays produced by the interaction of nucleons with MWB photons. The flux of these particles strongly depends on propagation distance, cosmological evolution parameter and the maximum energy of the cosmic rays. The possibility to detect the secondary neutrinos is also discussed.

• 一般社団法人日本物理学会の論文
• 1993-04-25

著者

• YOSHIDA Shijun

  Department of Physics, Hirosaki University

• YOSHIDA Shijun

  Astronomical Institute, Tohoku University

• Teshima Masahiro

  Institute For Cosmic Ray Research University Of Tokyo

• Yoshida Shigeru

  Department Of Applied Chemistry Graduate Schhol Of Science And Engineering Tokyo Institute Of Technology And Crest Japan Science And Technology Corporation (jst)

• TESHIMA Masahiro

  Institute for Cosmic Ray Research, University of Tokyo

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