Look up: POSITRON

1. 
   Positron
   A Nuclear particle with the mass of an electron but opposite charge.
   Found on http://home.nas.net/~dbc/cic_hamilton/di
   
   
2. 
   Positron
   A positron is a positively-charged particle of the same mass as the electron and with a charge equivalent but opposite in sign to that of the electron.
   Found on http://www.encyclo.co.uk/nol.php
   
   
3. 
   Positron
   The positron has properties which are identical to those of a negatively charged Electron , except that it has a positive charge. Positrons are unstable in matter and disappear by Annihilation with negatively charged electrons. This produces two Gamma Rays , each of 0.511 MeV which move in opposite directions. In simple terms positron emitters (e.g. Oxygen-15) decay by a Proton changing into a Neutron and releasing a positron. One can say that the Nucleus of the parent has too much energy, but not enough to release an Alpha Particle and so releases a positron instead.
   Found on http://www.ionactive.co.uk/glossary_atoz
   
   
4. 
   positron
   [n] - an elementary particle with positive charge
   Found on http://www.webdictionary.co.uk/definitio
   
   
5. 
   Positron
   See Beta Particle.
   Found on http://www.shponline.co.uk/glossary.asp?
   
   
6. 
   Positron
   The antiparticle of the electron. Discovered by Anderson in 1931. See also: Antiparticle, Blackett, Patrick Maynard Stuart, Electron, Electron-Positron Annihilation.
   Found on http://www.diracdelta.co.uk/science/sour
   
   
7. 
   Positron
   A Nuclear particle with the mass of an electron but opposite charge.
   Found on http://www.allchemicals.info/index/actio
   
   
8. 
   positron
   Positron is the antiparticle of the electron. It has the same mass and spin as an electron, and an equal but opposite charge.
   Found on http://www.ktf-split.hr/periodni/en/abc/
   
   
9. 
   positron
   elementary particle with approximately the same mass as the electron but with a positive elementary charge Category: Physics
   Found on http://www.mijnwoordenboek.nl/definition
   
   
10. 
    positron
    A subatomic particle of mass and charge equal to the electron but of opposite (i.e., positive) charge. ... Synonym: positive electron. ... (05 Mar 2000) ...
    Found on http://www.mondofacto.com/facts/dictiona
    
    
11. 
    positron
    antielectron noun an elementary particle with positive charge; interaction of a positron and an electron results in annihilation
    Found on http://wordnet.princeton.edu/perl/webwn?
    
    
12. 
    Positron
    The `positron` is the antiparticle or the antimatter counterpart of the electron. The positron has an electric charge of +1, a spin of 1/2, and the same mass as an electron. When a low-energy positron collides with a low-energy electron, annihilation occurs, resulting in the production of two gamma ray photons (see electron-positron annihilation). The first scientist deemed to have captured positrons through electron-positron annihilation was Chu...
    Found on http://en.wikipedia.org/wiki/Positron
    
    
13. 
    positron
    (poz´ĭ-tron) the antiparticle of the electron. When a positron is emitted by a radionuclide it combines with an electron and both undergo annihilation, producing two 511-keV gamma rays traveling in opposite directions. This effect is used in positron emission tomography.
    Found on http://www.mercksource.com/pp/us/cns/cns
    
    
14. 
    positron
    positively charged subatomic particle having the same mass and magnitude of charge as the electron and constituting the antiparticle of a negative ... [24 related articles]
    Found on http://www.britannica.com/eb/a-z/p/99
    
    
15. 
    positron
    positron, antielectron 1. An elementary particle having the same mass and magnitude of charge as an electron but exhibiting a positive charge; a positive electron. 2. A positively charged particle of the same mass and magnititude of charge as an electron; a positive electron.
    Found on http://www.wordinfo.info/words/index/inf
    
    
16. 
    positron
    A subatomic particle of mass and charge equal to the electron but of opposite (i.e., positive) charge. Syn: positive electron
    Found on
    
    
17. 
    Positron
    The antiparticle of the electron. It has the same mass as the electron but opposite (positive) electrical charge.
    Found on http://www-bdnew.fnal.gov/operations/acc
    
    
18. 
    Positron
    The antiparticle of the electron. It has the same mass as the electron but opposite (positive) electrical charge.
    Found on http://www-bdnew.fnal.gov/operations/acc
    
    
19. 
    positron
    elementary particle with one positive elementary electric charge and the same rest mass as the electron
    Found on http://www.electropedia.org/iev/iev.nsf/
    
    
20. 
    positron
    elementary particle with one positive electric charge of +e and the same rest mass as the electron
    Found on http://www.electropedia.org/iev/iev.nsf/
    
    
21. 
    positron
    an electron with positive charge
    Found on http://www.electropedia.org/iev/iev.nsf/
    
    
22. 
    positron
    Anderson's cloud chamber picture of cosmic radiation from 1932 showing for the first time the existence of the anti-electron that we now call the positron. In the picture a charged particle is seen entering from the bottom at high energy. It then looses some of the energy in passing through the 6 mm...
    Found on http://www.daviddarling.info/encyclopedi
    
    
23. 
    positron
    positron: see antiparticle.
    Found on http://www.infoplease.com/ce6/sci/A09176