Flux of Cosmic-Ray Particles withZ≥2over Texas

The fluxes of multiply charged cosmic-ray particles have been measured with nuclear emulsions in a high altitude balloon flight. The identification of $\alpha$-particles was based on "blob-gap" measurements; that of elements with $Z>~3$, on $\delta$-ray densities. The charge resolution obtained was satisfactory. To calculate the fluxes at the top of the atmosphere an extrapolation procedure, previously introduced in this laboratory, was employed. Two sets of parameters which account for the interactions in the residual atmosphere, differing considerably as far as their influence on the fluxes of light elements is concerned, were used. The results (in particles/${\mathrm{m}}^2$ sec sterad) are as follows: