Positron Definition

A positron can leave particle tracks in a bubble chamber.
A positron can leave particle tracks in a bubble chamber. MEHAU KULYK/SCIENCE PHOTO LIBRARY / Getty Images

Positron Definition: A positron or antielectron is the antimatter counterpart to an electron. A positron has the same mass as an electron and a spin of 1/2, but it has an electrical charge of +1. When a positron collides with an electron an annihilation occurs which results in the production of two or more gamma ray photons.

Also Known As: antielectron