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Alpha particle

Babylon English English dictionary

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alpha particle
positively charged particle made up of two protons and two neutrons, nucleus of a helium atom

Wikipedia English The Free Encyclopedia

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Alpha particle
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus. They are generally produced in the process of alpha decay, but may also be produced in other ways. Alpha particles are named after the first letter in the Greek alphabeta. The symbol for the alpha particle is a or a2+. Because they are identical to helium nuclei, they are also sometimes written as or indicating a helium ion with a +2 charge (missing its two electrons). If the ion gains electrons from its environment, the alpha particle can be written as a normal (electrically neutral) helium atom .

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WordNet 2.0 Dictionary

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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-Czech

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alpha particle
n. částice alfa

ASTRONOMY UNBOUND Dictionary

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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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