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James Van Allen journal, 1951?-December 1954

Page 54

Kruger
Cloud chamber filled with ([C? Cs? C sub 1?](D sub 4))
and irradiated with [Hour gamma-s's?]
counted ratio of pair to proton tracks

((E sub gamma) mev)             ([sigma? alpha?] x (10 exponent 28))
---------------------------------------------------------------
6.14                                             26.9+-3.8
6.95                                             25.7
7.04                                             24.2
-----------------------------------------------------------------------

R. E. Bell 
Fast Coincidence Circuits

Bell and Petch
Phys. Review 76, page 1409 (1949)

Bell and R. L. Graham
Phys. Review 78, page 490 (1950)
-----------------------------------------------------------------
Chalk [Ruier?]
(J. [N? M?]. [Robsons? Rolsons?] work)

n ---> beta + p

9 ---> 20 minutes = (t sub (1/2))

(beta exponent (- [crossed out: +]) upper limit 782 +- kev (straight on Fermi plot [c.e.? i.e.?] allowed)

coincidence proton - beta ray spectrometers

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Kruger Cloud chamber filled with ([C? Cs? C sub 1?](D sub 4)) and irradiated with [Hour gamma-s's?] counted ratio of pair to proton tracks ((E sub gamma) mev) ([sigma? alpha?] x (10 exponent 28)) --------------------------------------------------------------- 6.14 26.9+-3.8 6.95 25.7 7.04 24.2 ----------------------------------------------------------------------- R. E. Bell Fast Coincidence Circuits Bell and Petch Phys. Review 76, page 1409 (1949) Bell and R. L. Graham Phys. Review 78, page 490 (1950) ----------------------------------------------------------------- Chalk [Ruier?] (J. [N? M?]. [Robsons? Rolsons?] work) n ---> beta + p 9 ---> 20 minutes = (t sub (1/2)) (beta exponent (- [crossed out: +]) upper limit 782 +- kev (straight on Fermi plot [c.e.? i.e.?] allowed) coincidence proton - beta ray spectrometers