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单词 annihilation
释义
annihilation

Physics
  • The destruction of a particle and its antiparticle as a result of a collision between them. The annihilation radiation produced is carried away by photons or mesons. For example, in a collision between an electron and a positron the energy produced is carried away by two photons, each having an energy of 0.511 MeV, which is equivalent to the rest-mass energies of the annihilated particles plus their kinetic energies. When nucleons annihilate each other, the energy is carried away by mesons and antimesons.


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