title: Positron
text: A positron (also called an antielectron) is the antimatter version of an electron. It has the same mass and spin as an electron. However, it has a positive electric charge, whereas an electron has a negative charge. Like all antimatter, when it meets its so-called counterpartner, each are annihilated and turned into energy. The electron and positron disappear, and the total mass decreases. There is no name for this type of energy, as it is neither mechanical, radiation, chemical, electrical, nuclear, nor thermal. Although the energy does emit light photons when annihilated, it is converted from some form of energy that has not been named.
  
  A positron also very rarely makes a structure called positronium. Positronium is like an atom in many ways, but is very unstable, and usually quickly annihilates.
  
  Other websites 
   What is Antimatter? What is a Positron?  (from the Frequently Asked Questions :: Center for Antimatter-Matter Studies)
   Positron information search at SLAC 
   Positron Annihilation as a method of experimental physics used in materials research. 
   Original Publication by Anderson (DOI Link)
  
  Elementary particles
  Antimatter