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 ?
Jean et al., "INTEGRAL SPI limits on electron-positron annihilation radiation from the galactic plane," The Astrophysical Journal, vol.
The motion of the electron-positron pair causes a Doppler shift on the energy of the annihilation radiation. As a consequence, the line-shape gives the distribution of the longitudinal momentum component of the annihilating pair.
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.