annihilation radiation

American  

noun

Physics.

1. electromagnetic radiation produced by the coalescence and mutual annihilation of an atomic particle and its antiparticle, generally a positron and an electron, each pair forming two photons having a minimum energy of 0.5 million electron volts each.

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Etymology

Origin of annihilation radiation

First recorded in 1960–65

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Example Sentences

See Examples For:

annihilation radiation

Then they tracked the resulting annihilation radiation at the farthest edges of their experiment, using two photomultiplier tubes, anthracene crystals and a scintillation counter as a gamma-ray detector.

From Scientific American ● Mar. 16, 2023

The annihilation radiation they would produce is simply not observed.

From Textbooks ● Aug. 12, 2015

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