Abundance of primary protons at(13)×1015 ev inferred from a simulation of extensive air showers with ray families

M. Shima, To Saito, M. Sakata, Y. Yamamoto, K. Kasahara, T. Yuda, Shoji Torii, N. Hotta

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Abstract

A Monte Carlo simulation of extensive air showers (EASs) was done under a particle-interaction model and was compared with the EASs accompanied by -ray and hadronic families with total energy JE,H greater than 10 TeV obtained in the Mt. Norikura experiment (2780 m above sea level). The strong correlation between the shower size Ne of EASs with family and the primary energy, E0, was obtained from the simulation as E0/Ne=(2.0-0.7+2.7) GeV with 95% width. The flux of the EASs with family is sensitive to the chemical composition, especially to the fraction of protons in the primary cosmic-ray particles. The fraction of protons is inferred to be (206)% and (239)%, with one standard deviation (1), at energy (1.4-0.5+1.9)×1015 eV and (2.8-1.0+3.8)×1015 eV with 95% confidence interval, respectively, under the assumption of increasing cross section p-airE0.055 and approximate Feynman scaling in the fragmentation region. These values are in agreement with the values obtained from other mountain emulsion-chamber experiments within 2. The proton fraction thus obtained, around 20%, is much less than the normal abundance (40%) expected from direct observations at lower energies around 1012 eV. 1989 The American Physical Society.

Original languageEnglish
Pages (from-to)1275-1282
Number of pages8
JournalPhysical Review D
Volume39
Issue number5
DOIs
Publication statusPublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Shima, M., Saito, T., Sakata, M., Yamamoto, Y., Kasahara, K., Yuda, T., Torii, S., & Hotta, N. (1989). Abundance of primary protons at(13)×1015 ev inferred from a simulation of extensive air showers with ray families. Physical Review D, 39(5), 1275-1282. https://doi.org/10.1103/PhysRevD.39.1275