Creation of pairs
The term creation of pairs returns to the creation of a couple particle-antiparticle starting from a Photon (or of another neutral Boson of load).
This interaction was discovered for the first time by the Bubble chamber of Patrick Blackett, which was worth to him in 1948 the Nobel Prize of physics.
Thorough definition
To each Particule a Antiparticule corresponds. When those meet, they convert into energy. The quantity of produced energy is calculated thanks to the famous formula E=mc ². This energy can then be reconverted out of matter, to reform the initial couple particle-antiparticle. To illustrate that, let us imagine a electron and its antiparticle, the Positron. If those come into contact, they are converted into energy. Thereafter, this energy can reform the starting couple.
See too