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alpha particle
Babylon English English dictionaryDownload this dictionary
alpha particle
positively charged particle made up of two protons and two neutrons, nucleus of a helium atom

Wikipedia English The Free EncyclopediaDownload this dictionary
Alpha particle
Alpha particles (named after and denoted by the first letter in the Greek alphabet, a) consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is classically produced in the process of alpha decay, but may be produced also in other ways and given the same name. The alpha particle can be written as , or (as it is possible that the ion gains electrons from the environment; also, electrons are not important in nuclear chemistry).

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WordNet 2.0 DictionaryDownload this dictionary
alpha particle
Noun
1. a positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes
(hypernym) particle


Babylon English-CzechDownload this dictionary
alpha particle
n. částice alfa

ASTRONOMY UNBOUND DictionaryDownload this dictionary
Alpha particle
The fast moving nucleus of a helium atom. It is emitted in one type of radioactivity known as alpha decay. The nucleus has too much energy and too many protons but finds it energetically most feasible to eject a preformed helium nucleus rather than emit a proton. The alpha particle is monoenergetic and its energy, and also the half life, uniquely identify the radionuclide. Naturally occurring alpha particle emitters are heavier than lead (Z=82). See also atomic nucleus.


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