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James Van Allen journal, 1951?-December 1954

Page 24

[Hulsiger? Hulsiyer?]

In argon:
{  35 mev critical energy
{  26.9 ev/ion pair
{  19.7 gm/(cm exponent 2) radiation length

35/19.7 = 1.78 mev/(gm/(cm exponent 2))

((40 gm/(cm exponent 3))/(22,400)) x (57 cm) x (5 atoms) = 0.5 gm / (cm exponent 2) full length

(5.30)/((0.5)(1.78)) = 6.0 electrons full length = 1 Po alpha
--------------------------------

For electrons of (4 x (10 exponent 9)) ev
{   Shower maximum : 8 rad. lengths                }
{   Number of electrons at Max : 40 electrons   }
----------------------------------------------------------------------

Mr. Andrej Macek
2552 University Place, N. W.
Washington, D.C.

$10 for 6 page article
in Journal of Experimental and Theoretical Physics

Russian translations   <--------Dave Smith's G. W. U. acquaintance
---------------------------------------------------------------------
Mr. Samuel [Peraner? Peranes? Pevanes? Pevaner?]
1811 Wyoming Avenue N. W.
[phone:?] North 1123

Mr. C. [Klatchku? Klatchko?]
2027 Parkway Road N. W.
[phone:?] North 1686
(Art Norris' suggestion "Said to be quite good")

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[Hulsiger? Hulsiyer?] In argon: { 35 mev critical energy { 26.9 ev/ion pair { 19.7 gm/(cm exponent 2) radiation length 35/19.7 = 1.78 mev/(gm/(cm exponent 2)) ((40 gm/(cm exponent 3))/(22,400)) x (57 cm) x (5 atoms) = 0.5 gm / (cm exponent 2) full length (5.30)/((0.5)(1.78)) = 6.0 electrons full length = 1 Po alpha -------------------------------- For electrons of (4 x (10 exponent 9)) ev { Shower maximum : 8 rad. lengths } { Number of electrons at Max : 40 electrons } ---------------------------------------------------------------------- Mr. Andrej Macek 2552 University Place, N. W. Washington, D.C. $10 for 6 page article in Journal of Experimental and Theoretical Physics Russian translations <--------Dave Smith's G. W. U. acquaintance --------------------------------------------------------------------- Mr. Samuel [Peraner? Peranes? Pevanes? Pevaner?] 1811 Wyoming Avenue N. W. [phone:?] North 1123 Mr. C. [Klatchku? Klatchko?] 2027 Parkway Road N. W. [phone:?] North 1686 (Art Norris' suggestion "Said to be quite good")