alpha decay

alpha decay

noun Physics.
a radioactive process in which an alpha particle is emitted from the nucleus of an atom, decreasing its atomic number by two.

Origin:
1935–40

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Collins
World English Dictionary
alpha decay
 
n
the radioactive decay process resulting in emission of alpha particles

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
alpha decay  
The radioactive decay of an atomic nucleus by emission of an alpha particle (two protons bound to two neutrons). When an element undergoes alpha decay, its atomic number decreases by two.
The American Heritage® Science Dictionary
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