N. KawasumiI. TsushimaKen HondaK. HashimotoTsuneo MatanoK. MoriNaoya InoueRolando TiconaAkinori OhsawaM. Tamada2026-03-222026-03-22199310.1063/1.43871https://doi.org/10.1063/1.43871https://andeanlibrary.org/handle/123456789/61730Data of 34 familes with the accompanying air showers, observed by the combination of emulsion chamber and air shower array at Mt. Chacaltaya, are presented. Comparison with the simulation calculation concludes that a change is necessary in the characteristics of hadron interactions in E0≥1015 eV.enShowerEmulsionAir showerHadronPhysicsNuclear physicsarticle