Longitudinal development of air-shower electrons studied from the arrival time distributions of atmospheric cerenkov light measured at 5200 m above sea levelt

N. Inoue, T. Kaneko, H. Yoshii, K. Hagiwara, F. Kakimoto, Y. Miyazaki, T. Enoki, K. Suga, K. Nishi, N. Martinic, Pedro Miranda Loza, L. Siles

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Abstract

The longitudinal development of electrons in extensive air showers before the maximum has been studied by measuring the arrival time distributions of atmospheric Cerenkov light from air showers, with primary energies in the range 6 × 1015to 2 × 1017eV, in the Chacaltaya air-shower array. The Cerenkov light apparatus was the same as that operated at the Akeno air-shower array and described in the preceding paper. These arrival time distributions are consistent with those calculated using a model of particle interactions which contains Feynman scaling in the fragmentation region, an El/2multiplicity law in the pionisation region and a rising cross section for primary protons. Such a model also reproduces the arrival time distributions of Cerenkov light measured in the Akeno air-shower array as described in the preceding paper, which implies a very fast development before the maximum and a slow development after the maximum. The multiplicity in this model is much higher than that given by an extrapolation of empirical formulae for multiplicities measured with accelerators up to s1/2of 540 GeV and therefore the present result suggests a commencement of particle interactions with copious production of π±and π0or gamma rays above 1016eV.

Original languageEnglish
Pages (from-to)669-678
Number of pages10
JournalJournal of Physics G: Nuclear Physics
Volume11
Issue number5
DOIs
StatePublished - May 1985

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