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James Van Allen journal, 1951?-December 1954

Page 51

Aron, Hoffman and Williams

(Used 340 Mev protons)

{ gas } { W/WA } { 340 Mev proton W } { Po alpha W }
------------------------------------------------------------------------
{   (H sub 2)   } {   1.4   } {  34.9 ev  } {  35.1 ev  }
{        He        } {  1.02  } {  25.3 ev  } {  30.2 ev  }
{   (N sub 2)   } {  1.31  } {  32.7 ev  } {  36.3 ev  }
{   (O sub 2)   } {  1.23  } {  30.6 ev  } {  34.5 ev  }
{          A         } {   1.0  } { 24.84 ev } {  27.6 ev  }
{air calculated} {    ?    } {  32.2 ev  } {  35.8 ev  }
------------------------------------------------------------------
Roberts (Rochester)
   (Peters) Cosmic Radiation not as old as (10 exponent 6) years due to absence of Li, B, Be 
Blackett objected due to no account of intergalactic magnetic field and Robert used much too [crossed out: low] high value of intergalactic density.
--------------------------------------------------------------------
Kruger (Illinois) -- Bremstrahlung [integral?] in 

Pb (0.005")
((delta)(E))/E   50 (I) [10? /0?] Mev electrons
5% (2.7 x (10 exponent -24)) (cm exponent 2)
5 to 10% 3.7 [?]

65+-15Mev electrons
5%  (2.5 x (10 exponent -24))
5 to 10% (2.8 x (10 exponent -24))

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Aron, Hoffman and Williams (Used 340 Mev protons) { gas } { W/WA } { 340 Mev proton W } { Po alpha W } ------------------------------------------------------------------------ { (H sub 2) } { 1.4 } { 34.9 ev } { 35.1 ev } { He } { 1.02 } { 25.3 ev } { 30.2 ev } { (N sub 2) } { 1.31 } { 32.7 ev } { 36.3 ev } { (O sub 2) } { 1.23 } { 30.6 ev } { 34.5 ev } { A } { 1.0 } { 24.84 ev } { 27.6 ev } {air calculated} { ? } { 32.2 ev } { 35.8 ev } ------------------------------------------------------------------ Roberts (Rochester) (Peters) Cosmic Radiation not as old as (10 exponent 6) years due to absence of Li, B, Be Blackett objected due to no account of intergalactic magnetic field and Robert used much too [crossed out: low] high value of intergalactic density. -------------------------------------------------------------------- Kruger (Illinois) -- Bremstrahlung [integral?] in Pb (0.005") ((delta)(E))/E 50 (I) [10? /0?] Mev electrons 5% (2.7 x (10 exponent -24)) (cm exponent 2) 5 to 10% 3.7 [?] 65+-15Mev electrons 5% (2.5 x (10 exponent -24)) 5 to 10% (2.8 x (10 exponent -24))