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

Research output: Contribution to journalArticle

14 Citations (Scopus)

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

Fingerprint

cosmic ray showers
rays
protons
simulation
primary cosmic rays
energy
particle interactions
showers
sea level
mountains
emulsions
confidence
standard deviation
fragmentation
chemical composition
chambers
intervals
scaling
cross sections

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Shima, M., Saito, T., Sakata, M., Yamamoto, Y., Kasahara, K., Yuda, T., ... 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

Abundance of primary protons at(13)×1015 ev inferred from a simulation of extensive air showers with ray families. / Shima, M.; Saito, To; Sakata, M.; Yamamoto, Y.; Kasahara, K.; Yuda, T.; Torii, Shoji; Hotta, N.

In: Physical Review D, Vol. 39, No. 5, 1989, p. 1275-1282.

Research output: Contribution to journalArticle

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, vol. 39, no. 5, pp. 1275-1282. https://doi.org/10.1103/PhysRevD.39.1275
Shima, M. ; Saito, To ; Sakata, M. ; Yamamoto, Y. ; Kasahara, K. ; Yuda, T. ; Torii, Shoji ; Hotta, N. / Abundance of primary protons at(13)×1015 ev inferred from a simulation of extensive air showers with ray families. In: Physical Review D. 1989 ; Vol. 39, No. 5. pp. 1275-1282.
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