606 



BELL SYSTEM TECHNICAL JOURNAL 



■* 200 



O 



P 150 



10 2.0 30 



RANGE OF INCIDENT CC-PARTICLES 



Fig. 18 — Transmutation of beryllium by impact of alpha-particles, with produc- 

 tion of neutrons; rate of observed transmutation as function of K, for a very thin 

 film and for a thick layer (dashed and full curves respectively), illustrating resonance. 

 (Chadwick; Proc. Roy. Soc). 



3.6 3.5 3.4 3.3 



MAXIMUM RANGE OF OrPARTICLES 



Fig. 19 — Transmutation of aluminium by impact of alpha-particles, with produc- 

 tion of protons; rate of observed transmutation as function of residual range of alpha- 

 particles, illustrating resonance. (Chadwick & Constable; Proc. Roy. Soc). 



