Primary proton spectrum around the knee deduced from the emulsion-chamber data obtained at Mts. Fuji and Kanbala

J. Huang, N. Hotta, K. Kasahara, I. Ohta, Shunsuke Ozawa, T. Saito, M. Shibata, X. W. Xu, T. Yuda

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We have done extensive Monte Carlo simulations using the new simulation codes of CORSIKA and COSMOS to compare with the gamma-family data obtained at Mts. Fuji (3750 m above sea level) and Kanbala (5500 m above sea level). Then, we estimated the primary proton and helium spectra around the knee energy region using a multiple-layered feed-forward neural network as a classifier of primary particle kind. The selection efficiency of proton-induced family events is estimated to be 82%. The flux value of protons at 2 × 1015 eV is (5.5 ± 1:5) × 10-14 (m-2 s-1 sr-1 GeV-1). The result suggests heavy-enriched primary composition around the knee region.

Original languageEnglish
Pages (from-to)637-648
Number of pages12
JournalAstroparticle Physics
Volume18
Issue number6
DOIs
Publication statusPublished - 2003 Mar
Externally publishedYes

Keywords

  • Cosmic ray
  • Emulsion chamber
  • Gamma-family
  • Knee region
  • Monte Carlo simulation
  • Neural network
  • Proton

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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