Astrophysics (Index)About

positron

(e+, antielectron)
(electron-like antimatter particle with electric charge of +1)

A positron is the antimatter-equivalent of an electron (i.e., an antielectron), with the same mass but opposite electrical charge. It is a stable lepton that can be produced by pair production, but unlike antiprotons and antineutrons, is also produced by "normal-matter" nuclear reactions, such as fusion and beta decay. The term beta particle refers to either an electron or a positron produced by beta decay.

Like any particle/antiparticle pair, the meeting of a positron and an electron results in annihilation, which produces two photons with whose photon energies sum to the kinetic energy and rest energy of the positron and electron, minimally 1.022 MeV. This is the inverse of pair production.


(physics,particle)
Further reading:
https://en.wikipedia.org/wiki/Positron
https://pasayten.org/the-field-guide-to-particle-physics/positron
http://positrons.physics.lsa.umich.edu/nanopos/PALS-intro/psitronphysics.htm
https://www.chemeurope.com/en/encyclopedia/Positron.html

Referenced by pages:
alpha particle
AMS-02
antimatter
beta decay
Bethe-Heitler process
Cherenkov radiation
CNO cycle
curvature radiation
dark matter annihilation
electron (e-)
Faraday rotation
GZK limit
ion
pair production
pair-instability supernova (PISN)
PAMELA
particle
Penrose Compton scattering (PCS)
plasma
plasma frequency
radioactive decay
radioactivity
rp-process
spark chamber
weak interaction

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