A systematic study of the hybrid experiment at Mt.Chacaltaya

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

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

2 Scopus citations


In the hybrid experiment on Mt.Chacaltaya, we can observe three different components of airshowers, that is, air-shower size, burst-density and high energy families (a bundle of high energy particles). Burst-density in each block of hadron calorimeters are newly recalculated in simulations in oder to compare directly to the experimental data. Energy deposits in the scintillators of the hadron calorimeters are calculated using GEANT4 for every particle, incident upon the hadron calorimeter, in the air-showers simulated using CORSIKA, and are converted into burst-density, taking into consideration the exact structure of experimental hadron calorimeter. We study correlations among three observable components in the air-showers. Correlations between air-shower size and burst-density and those between air-shower size and accompanied family energy can be explained by model calculations by adjusting primary particle composition, the former correlation is in favor of proton-primaries but the latter iron-primaries. No model can describe well observed correlations between burst-density and family energy. That is, the observed family energy accompanied by the air-showers with larger burst-density 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.

Original languageEnglish
Title of host publicationISVHECRI 2012 - 17th International Symposium on Very High Energy Cosmic Ray Interactions
StatePublished - 2013
Event17th International Symposium on Very High Energy Cosmic Ray Interactions, ISVHECRI 2012 - Berlin, Germany
Duration: 10 Aug 201215 Aug 2012

Publication series

NameEPJ Web of Conferences
ISSN (Print)2101-6275
ISSN (Electronic)2100-014X


Conference17th International Symposium on Very High Energy Cosmic Ray Interactions, ISVHECRI 2012


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