Physics
Scientific paper
Dec 1955
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1955phrv..100.1460w&link_type=abstract
Physical Review, vol. 100, Issue 5, pp. 1460-1467
Physics
7
Scientific paper
A measurement of the intensities of the low-Z components of the primary cosmic radiation has been made in the upper atmosphere at a depth of 13 g/cm2 by means of a "Skyhook" balloon flown at λ=41.5°. The measuring instrument consisted of a thin (3.0 g/cm2) Čerenkov detector placed within the solid angle of a Geiger counter telescope. A Čerenkov detector was used because of its unique discrimination against slow particles. A system of guard and shower counters and circuits was included to identify side showers and background events occurring in the detector. A vertical intensity of 82+/-9 alpha particles/meter2 steradian sec, at the top of the atmosphere was obtained, based on 374 counts attributed to alpha particles. Data obtained as the balloon rose to altitude gave a value of 43+/-8 g/cm2 for the apparent absorption mean free path of alpha particles in air. An upper limit was set on the intensity of primary protons at this depth. In addition, a small number of counts that could be attributed to particles with 3<=Z<=5 were obtained and are discussed.
McDonald Frank B.
Webber William R.
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