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James A. Van Allen lab journal, March 1958-September 1959

Page 112

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the order of magnitude of that of the neutron will result. (Should make detailed calculations) Decay of neutrons from the sun in the vicinity of the earth has been suggested by J. Kasper as a possibility for injection. This is a conceivable possibility. But work of Bergstrahl and [Perlow?] suggests neutron flux from the sun negligible compared to that from the earth on basis of lack of day-night differences with BF3, counters at 100,000 feet. (Shold look at more critically! and perhaps devise a more discriminating experiment)
 
Van Allen Papers