delta ray

noun Physics.
a low-energy electron emitted by a substance after bombardment by higher-energy particles, as alpha particles.

Origin:
1905–10

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delta ray
 
n
a particle, esp an electron, ejected from matter by ionizing radiation

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

delta ray

in physics, any atomic electron that has acquired sufficient energy by recoiling from a charged particle passing through matter to force, in turn, some dozens of electrons out of other atoms along its own trajectory.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The default straggling model was changed to restricted energy losses including delta ray production.
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