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James Van Allen journal, 1951?-December 1954

Page 53

[(N(pi exponent 0))? or: (N sub (pi exponent 0))?]/[(N(pi exponent +-))? or: (N sub (pi exponent +-))?]  ~0.5

Also studied origin of gamma-ray pairs with respect to shower origin.

(1.5 x (10 exponent -14))<(t sub (1/2))<(5 x (10 exponent -14) second)

Probably (3 x (10 exponent -14))
-------------------------------------------------------------------------
Wilkinson Photodisintegration of (D sub 2)

(1) Sphere 10 cm diameter (D sub 2) at 40 atmospheres collector road at 10 kv.

(2) Proportional counter (A + (D sub 2)) at 6 atmospheres with central wire at 2 to 4 kv

gamma ray intensity [by?] brass G.M. tube, calibrating 6.14 with (F exponent 19) (p, alpha) counting alpha particles and at 17.6   (Li exponent 7) (p alpha) using graphite ionization chamber.

{ Target } { (E sub gamma) Mev } { sigma x (10 exponent 28) cm }
-----------------------------------------------------------------
{ (N exponent 15) } { 4.45 } { 24.3 +- 1.6 }
{ (F exponent 19) } { 6.14 } { 21.9 +- 1 }
{ (Be exponent 9) } { 7.39 } { 18.4 +- 1.2 }
{ (C exponent 13) } { 8.14 } { 16.9 +- 1.2 }
{ (B exponent 11) } { 12.5 } { 10.4 +- 1 }
{ (Li exponent 7) } { 17.6 } { 7.7 +- 0.9 }

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[(N(pi exponent 0))? or: (N sub (pi exponent 0))?]/[(N(pi exponent +-))? or: (N sub (pi exponent +-))?] ~0.5 Also studied origin of gamma-ray pairs with respect to shower origin. (1.5 x (10 exponent -14))<(t sub (1/2))<(5 x (10 exponent -14) second) Probably (3 x (10 exponent -14)) ------------------------------------------------------------------------- Wilkinson Photodisintegration of (D sub 2) (1) Sphere 10 cm diameter (D sub 2) at 40 atmospheres collector road at 10 kv. (2) Proportional counter (A + (D sub 2)) at 6 atmospheres with central wire at 2 to 4 kv gamma ray intensity [by?] brass G.M. tube, calibrating 6.14 with (F exponent 19) (p, alpha) counting alpha particles and at 17.6 (Li exponent 7) (p alpha) using graphite ionization chamber. { Target } { (E sub gamma) Mev } { sigma x (10 exponent 28) cm } ----------------------------------------------------------------- { (N exponent 15) } { 4.45 } { 24.3 +- 1.6 } { (F exponent 19) } { 6.14 } { 21.9 +- 1 } { (Be exponent 9) } { 7.39 } { 18.4 +- 1.2 } { (C exponent 13) } { 8.14 } { 16.9 +- 1.2 } { (B exponent 11) } { 12.5 } { 10.4 +- 1 } { (Li exponent 7) } { 17.6 } { 7.7 +- 0.9 }