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beta decay, beta disintegration
The radioactive decay of an atomic nucleus accompanied by emission of a beta particle.

Beta decay is the disintegration of the nucleus of an atom to produce a beta particle, or high-speed electron, and an electron-antineutrino.

During beta decay a neutron in the nucleus changes into a proton, thereby increasing the atomic number by one while the mass number stays the same.

—Information compiled from
Scientific American Science Desk Reference;
John Wiley & Sons, Inc.; New York; 1999; page 125.
This entry is located in the following units: beta; B, β + (page 1) integ- (page 1)