A Halo event observed by the hybrid experiment at Mt. Chacaltaya

H. Aoki, K. Hashimoto, K. Honda, N. Inoue, N. Kawasumi, N. Martinic, C. Navia O., N. Ochi, N. Ohmori, A. Ohsawa, C. Oliveira, K. Shinozaki, M. Tamada, Rolando Ticona Peralta, I. Tsushima

Research output: Contribution to journalArticlepeer-review


An experiment using an air shower array, a hadron calorimeter and an emulsion chamber is under way at Mt. Chacaltaya (5200 m, Bolivia). One of the highest energy events, having a halo (∼ 1 cm) in the centre of the family together with many γ-ray and hadron showers, is analyzed in detail. Available data for the event are on the halo (Ehalo = 750 TeV) and on the high energy particles of electron/photon components by the emulsion chamber, and on the characteristics of the accompanied air shower (Ne = 7.0 × 107, s = 0.59) by the air shower array. The diagram of the air shower size and the total energy of electron/ photon components in the family, which shows discrepancy between the experimental data and simulated events (QGSJET code for nuclear collisions) in our previous reports, is discussed including the present event.

Original languageEnglish
Pages (from-to)223-226
Number of pages4
JournalNuclear Physics B - Proceedings Supplements
Issue number1
StatePublished - Jan 2006


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