annihilation radiation


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annihilation radiation

[ə‚nī·ə′lā·shən ‚rād·ē′ā·shən]
(particle physics)
Electromagnetic radiation arising from the collision, and resulting annihilation, of an electron and a positron, or of any particle and its antiparticle.
References in periodicals archive ?
The motion of the electron-positron pair causes a Doppler shift on the energy of the annihilation radiation.
Whatever the "fountain" may be, its recent discovery "is the first breakthrough" toward understanding the annihilation radiation from our galaxy, according to David Smith of the Space Sciences Laboratory at the University of California, Berkeley.
A year-long study with a GRO detector has for the first time mapped in detail the distribution of this emission along the plane of the galaxy To the astonishment of astronomers, it also recorded a broad distribution of the same annihilation radiation in a region some 3,000 light-years out from the disk of the Milky Way.