Alpha particle tracks including a collision with a massive nucleus (e.g. nitrogen or oxygen)
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Alpha particle tracks including a collision with a massive nucleus (e.g. nitrogen or oxygen)

Alpha particle tracks in wet nitrogen. One collided with a nitrogen nucleus and moved to the right. The recoiling nucleus made the short thick track.
 

 
P.M.S.Blackett (1925) Proc. Roy. Soc., A, vol. 107, Pl.6.