Summary
The existence of EAS with an abnormally low number of penetrating particles is demonstrated by the detailed analysis of the results of 105 hodoscopic recordings obtained during a running time of 28 months. These EAS constitute electromagnetic cascades deriving from a high-energy photon ((1015÷1016) eV). Their frequency is equal to (l±0.35)% in relation to the ordinary nuclear showers of equal size (and several times smaller if compared to showers of the same energy). On the basis of a sharp distinction between the two types of shower, there is reason to ascribe an extra-atmospheric source to these high-energy photons.
Riassunto
Con l’analisi dettagliata di 105 registrazioni odoscopiche ottenute durante un periodo operativo di 28 mesi, si dimoatra l’esistenza di sciami estesi dell’aria con un numero di particelle penetranti anormalmente basso. Questi sciami costituiscono cascate elettromagneticbe derivanti da un fotone di alta energia ((1015/1016) eV). La loro frequenza è uguale a (1 ±0.35)% rispetto agli sciami nucleari ordinari di eguale dimensione (e parecchie volte inferiore in confronto a sciami della stessa energia). Sulla base di una netta distinzione fra i due tipi di sciami, ci sono motivi per assegnare un’origine extra atmosferica e questi fotoni di alta energia.
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Firkowski, R., Gavin, J., Zawadzki, A. et al. Evidence for the existence of high-energy photon-initiated E.A.S. Nuovo Cim 29, 19–39 (1963). https://doi.org/10.1007/BF02750150
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DOI: https://doi.org/10.1007/BF02750150