Identification of mass numbers concerning the nuclei beginning the ignition of the atmospheric extensive air showers (EAS) is vital in the studies of Ultra High Cosmic Rays Interactions (UHCRI). The present study introduces a simple technique in processing the shower data at the height of detector level (1400 m over sea-level) to identify the nucleus starting the cascade of the shower. CORSIKA 7.6400, which is the EAS-generator is used to generate EAS data at detection level of 1400 m over sea-level and incidence energy ~ 106GeV. The data are analyzed and the energy spectrum is obtained for the generated EAS. The EAS spectra for light nuclei (1H and 4He), medium nuclei (24Mg), and Heavy nuclei (48Ti, 52Cr, Fe) are obtained, totally and with photons are subtracted. It is found that, the spectral slopes of the tail of the spectra with photons subtracted depend on the primary nuclei’s mass-number. Keywords: Ultra High Cosmic Rays Interactions (UHCRI), primary event nuclei, CORSIKA, extensive air showers (EAS), spectral tail.
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