Prof.dr Ing. J.F.J van den Brand, Sep. 2006  – 24
Productie van e+e- paren
Het inverse proces komt ook voor, waarbij g-straling overgaat in een elektron-positron paar
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The inverse to the annihilation process also occurs and g-rays with sufficient energy can convert to matter and antimatter. We can sketch it using a simple line drawing again.

Evidence that it occurs is found on another of Anderson’s beautiful cloud chamber pictures where we see three g -rays have converted to electron-positron pairs just outside the cloud chamber.