Abstract
A small stack of nuclear emulsions has been used to determine the flux of cosmic ray protons over Texas. The experimental procedure was similar to that used previously, but due to the more favourable conditions of the exposure the dependence of the value at the top of the atmosphere on the, rather uncertain, corrections for the overlying matter, was greatly reduced, the correction being 0·902 o.f. the previous 0·694. The value found for the flux at the top of the atmosphere on July 12, 1960 was 540 ± 50 protons/ma ster sec.
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