Abstract
Adding the results obtained by measuring the charges of 117 heavy nuclei (Z ⩾ 10) to those obtained in a previous paper, we determined the values of the ratioN(Z ⩾ 15)/N(Z ⩾ 10) at flight altitude and at the top of the atmosphere, and of the ratioN(Z = 26)/N(Z ⩾ 10) at flight altitude, at the top of the atmosphere and at the C.R. source. It results that the chemical composition of the C.R. source differs from the average composition of the universe, being much richer in heavy nuclei (Z ⩾ 15) and in particular in Iron. The absorption mean free path in air was also determined studying the zenith angle dependence of C.R. flux.
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