We consider a relationship between the difference in spectral indices of the spectra of single hadrons and all hadrons (βsngl − βh) and the difference in the indices of the spectra of galactic cosmic ray (GCR) protons and nuclei. It is demonstrated that at the mountain level the ratio (βp − βZ)/(βsngl − βh) is always larger than unity, if (βsngl − βh) > 0.1. From the experimental value βsngl − βh = 0.4 ± 0.05 we derive that, in the vicinity of E = 10 TeV, βp − βZ ≥ 0.49 ± 0.06 , i.e., βp ≥ 3.09 ± 0.06.

A new method of determining the spectral index for protons in the energy range about 10 13 eV

The energy spectra of high energy gamma-rays and hadrons were obtained by the emulsion chamber with 40 c.u. thickness at Mt. Fuji (3750 m). These results are compared with the Monte Carlo calculation based on the same model which is used in a family analysis. Our data are compatible with the model of heavy-enriched primary and scaling in the fragmentation region.

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N. Hotta

Papers

High energy gamma-rays and hadrons at Mount Fuji