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Source Work

1958: C.A. Coulson: Electricity (5th ed.):

Chapter $\text {I}$: Preliminary Survey
$\S 1$. Electrostatics


The smallest positive charge ... is on the proton; the same charge exists on the positive electron, a much lighter particle than the proton, but this particle is not stable ...


Technically speaking, the positron is intrinsically stable.

However, it does not in general stay around very long, because it swiftly encounters an electron, which are ubiquitous.

The pair then annihilate each other in a burst of energy.