A study of EAS cores detected by the hybrid experiment at Mt.Chacaltaya

H. Aoki, K. Honda, N. Inoue, N. Kawasumi, N. Martinic, N. Ochi, N. Ohmori, A. Ohsawa, H. Semba, M. Tamada, Rolando Ticona Peralta

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Correlations among three components in the air-showers, i.e., air-shower size, burst-size and accompanied family energy, observed by Chacaltaya hybrid experiment, are studied by comparing those of simulated data. Burst-density in each block of hadron calorimeters, located at the center of air-shower array, are newly calculated using the GEANT4 simulation code in oder to compare directly to the experimental data. Air-shower size is also recalculated using EGS4 in the CORSIKA package and also taking into accounts contributions of scintillator response of gamma-ray component in the air-shower. It is shown no model can describe well observed correlations between burst-size and family energy. The burst-density of the events accompanied by atmospheric family is systematically larger than expectation and also the observed family energy accompanied by the air-showers with larger burst-size is systematically smaller than that expected in the simulated events. Effects of a fluctuation in the cross-section of hadronic interactions are studied to settle the disagreement between experimental data and simulations. Inclusion of the fluctuation of the cross-section makes less attenuation of energy flow of the hadronic component in the air-shower and explains some characteristics of the experimental data.

Original languageEnglish
Title of host publicationProceedings of the 33rd International Cosmic Rays Conference, ICRC 2013
PublisherSociedade Brasileira de Fisica
ISBN (Electronic)9788589064293
StatePublished - 2013
Event33rd International Cosmic Rays Conference, ICRC 2013 - Rio de Janeiro, Brazil
Duration: 2 Jul 20139 Jul 2013

Publication series

NameProceedings of the 33rd International Cosmic Rays Conference, ICRC 2013


Conference33rd International Cosmic Rays Conference, ICRC 2013
CityRio de Janeiro

Bibliographical note

Publisher Copyright:
© 2013 Sociedade Brasileira de Fisica. All Rights Reserved.


  • Air-shower
  • Burst
  • Gamma-family
  • Mountain experiment


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