Big Bertha Thing positron (Image BMP 13K)Cosmic Ray Series
Caption;-
Another pair of tracks, arising simultaneously,
from a common point. The two particles responsible,
for these tracks, produce equal specific ionizations.
The one leaving the track of greater curvature
is an electron of 27 MeV energy. The one leaving
the track of smaller curvature was apparently left,
by a particle not then known to exist,
a particle identical with the electron,
except that it carries a positive charge.
It is a 450 MeV positron.
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Occams' Razor says the simplest explanation is usually right.