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James Van Allen journal, 1951?-December 1954
Page 91
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over the range of stripping nuclei from air to brass and for [incident?] nuclei from helium to iron ------------------------------------------------------------------------- Also indicate how study of development of soft showers can be used to get flux and energy determinations in (10 exponent 11) <= epsilon <= (10 exponent 14) ev ---------------------------------------------------------------------- For Geomagnetic cut-off use 0.35 [or 0.30?] Bev / nucleon at lambda = 55 for protons : 0.9 at lambda = 41.7 for protons : 4.0 1.50 - --- for Ca, Li, Mg, [W? N?] (1.35 for Iron) for protons : 7.4 3.5 at lambda = 30 degrees 6.5 at lambda = 0 for protons : 14 -------------------------------------------------------------------------------------- Only real extension of spectrum so far achieved beyond geomagnetic vertical cut-off range is for Z > 10 and there it is a bit crude but suggestive up to [~50?] Bev / nucleon from figure 13 I read
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over the range of stripping nuclei from air to brass and for [incident?] nuclei from helium to iron ------------------------------------------------------------------------- Also indicate how study of development of soft showers can be used to get flux and energy determinations in (10 exponent 11) <= epsilon <= (10 exponent 14) ev ---------------------------------------------------------------------- For Geomagnetic cut-off use 0.35 [or 0.30?] Bev / nucleon at lambda = 55 for protons : 0.9 at lambda = 41.7 for protons : 4.0 1.50 - --- for Ca, Li, Mg, [W? N?] (1.35 for Iron) for protons : 7.4 3.5 at lambda = 30 degrees 6.5 at lambda = 0 for protons : 14 -------------------------------------------------------------------------------------- Only real extension of spectrum so far achieved beyond geomagnetic vertical cut-off range is for Z > 10 and there it is a bit crude but suggestive up to [~50?] Bev / nucleon from figure 13 I read
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