Physics
Scientific paper
Jan 1956
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1956phrv..101..826l&link_type=abstract
Physical Review, vol. 101, Issue 2, pp. 826-834
Physics
6
Scientific paper
Measurements have been made on the charge spectrum of cosmic rays at geomagnetic latitude 41°. The value 88+/-8 particles/m2 sec sterad was found for the primary alpha-particle flux. For the flux of nuclei with 6<=Z<=8 the value 7.4+/-1.7 particles/m2 sec sterad was found, and for the Z>=9 flux, the value 4+/-2. It is most probable that all of the Li, Be, B nuclei observed were secondary. The experiment sets an upper limit 0.25 on the abundance of primary Li, Be, B relative to the medium elements (6<=Z<=10). The data were obtained during balloon flights at a level of 16 g/cm2. Events selected by a Geiger counter telescope were measured with a Čerenkov detector, and a record was kept of the pulse heights. When the pulse was greater than two relativistic protons would produce, a cloud chamber above the Čerenkov detector was triggered. In that way 394 events were photographed. As often as not, the photographs showed the track of a multiply charged particle traversing the telescope unaccompanied. The corresponding pulse height then served to determine the particle's charge.
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