Electron–positron annihilation occurs when an electron (e−) and a positron (e+, the electron’s antiparticle) collide.
What is Positron:
The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. The positron has an electric charge of +1 e, a spin of 1/2 (the same as the electron), and has the same mass as an electron.
At low energies, the result of the collision is the annihilation of the electron and positron, and the creation of energetic photons:
e− + e+ → γ + γ
Conservations in Electron & Positron interactions,
- Conservation of electric charge. The net charge before and after is zero.
- Conservation of linear momentum and total energy.
- Conservation of angular momentum.
- Conservation of total lepton number.
Application of electron-positron interactions:
- Measuring the Fermi surface and Band Structure in Metals.
The reverse reaction, electron–positron creation, is a form of pair production governed by two-photon physics.
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Source:
[1] Wikipedia Contributors. “Electron–Positron Annihilation.” Wikipedia, Wikimedia Foundation, 23 May 2021, en.wikipedia.org/wiki/Electron%E2%80%93positron_annihilation. Accessed 31 July 2021.
[2] Wikipedia Contributors. “Positron.” Wikipedia, Wikimedia Foundation, 26 July 2021, en.wikipedia.org/wiki/Positron. Accessed 31 July 2021.