Papabravo

Joined Feb 24, 2006
15,491
It is a shorthand notation for an "electron" with 1 unit of negative charge. That unit of electric charge is equal to approximately 1.60217662 × 10^-19 coulombs.

The notation is used to describe the reactions of elementary particles of which the electron is one.

https://www.nuclear-power.net/notation-nuclear-reactions/