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James Van Allen journal, 1951?-December 1954
Page 94
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depth in the emulsion. Each depth corresponds to a particular pressure p (and therefore altitude) and the number of tracks reaching this depth is proportional to the time above the corresponding altitude therefore, an integral altitude time curve is obtained. Has been proved useful down to p = 1 cm of Hg. --------------------------------------------------------------------- 5 October -- Last August (July ?) I proposed for R. Ellis the following experiment: (Schematic: [sketch/picture] cross-section drawing including: two G.M. tubes, one photomultiplier, etc [Terphenyl?] in Xylene (or other liquid scintillator) Object to get (at high altitude in a balloon) (sigma sub carbon) = the burst production cross-section of primary radiation is carbon by
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depth in the emulsion. Each depth corresponds to a particular pressure p (and therefore altitude) and the number of tracks reaching this depth is proportional to the time above the corresponding altitude therefore, an integral altitude time curve is obtained. Has been proved useful down to p = 1 cm of Hg. --------------------------------------------------------------------- 5 October -- Last August (July ?) I proposed for R. Ellis the following experiment: (Schematic: [sketch/picture] cross-section drawing including: two G.M. tubes, one photomultiplier, etc [Terphenyl?] in Xylene (or other liquid scintillator) Object to get (at high altitude in a balloon) (sigma sub carbon) = the burst production cross-section of primary radiation is carbon by
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