One of the latest techniques used to accumulate this particle is slowing it within a tungsten crystal in a cryogenic vacuum. Its astronomical importance explains the use of the INTEGRAL observatory space project in finding signatures of its production. It was detected by passing cosmic rays through a gas chamber, and then using a magnet to deflect 
One of the latest techniques used to accumulate this particle is slowing it within a tungsten crystal in a cryogenic vacuum. Its astronomical importance explains the use of the INTEGRAL observatory space project in finding signatures of its production. It was detected by passing cosmic rays through a gas chamber, and then using a magnet to deflect particles of different charges, but its existence was predicted four years earlier as a consequence of the Dirac equation. For 10 points, name this particle with a charge of +1 and which annihilates with the electron, for which it is an antiparticle
One of the latest techniques used to accumulate this particle is slowing it within a tungsten crystal in a cryogenic vacuum.
{positron} [accept {anti-electron} before electron is mentioned]