Aug 1954
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1954phrv...95..782s&link_type=abstract
Physical Review, vol. 95, Issue 3, pp. 782-792
Physics
7
Scientific paper
Primary cosmic-ray nuclei of z>=2 were observed in a balloon-borne cloud chamber. The chamber was triggered by events with ionization loss >=6 minimum in each of three proportional counters, arranged in a telescope. Proportional counter pulse amplitudes were recorded by a neon bulb system. Two Skyhook daytime balloon flights at geomagnetic latitude 41° maintained average altitudes of 17.6 and 14.3 g/cm2. In the 0.77 hour sensitive time, in two flights, there were observed in the cloud chamber (charge determined from both cloud chamber and proportional counter data) 3-5 Li, 1 Be, 0 B, and 21 z>=6 nuclei. A primary flux of 10.2+4.5-3.4 particles per m2 sec sterad is found for the z>=6 nuclei. An unusually large fraction of this group is indicated to be heavier than oxygen. The primary flux of Li, Be, and B nuclei is found to be 5+32-5 percent of the primary flux of z>=6 nuclei, from which we conclude that heavy nuclei have traversed less than 7 g/cm2 interstellar hydrogen [=(4n)×106 light years, where n=number of H atoms per cm3]. The proportional counter data alone showed a 14+/-16 percent decrease in intensity of particles of z>8 from morning to afternoon.
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