单词	positron
释义	positron /ˈpɒzɪtrɒn / noun Physics A subatomic particle with the same mass as an electron and a numerically equal but positive charge.The term accelerators most commonly refers to particle accelerators, devices for increasing the velocity of subatomic particles such as protons, electrons, and positrons.... The full scattering amplitude is the sum of all contributions from all possible loops of photons, electrons, positrons, and other available particles. The decaying atoms emit positrons, which encounter electrons and are annihilated, releasing pairs of gamma rays. Origin 1930s: from positive + -tron.
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