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partícula alfa
1) Nucleus formed by the α-process (q.v.) (see even-even nuclei.)
2) Particle first discovered in radioactive α decay, and later identified as helium nuclei (two protons and two neutrons bound together.)
3) The nucleus of a 4He atom, consisting of two protons and two neutrons. Mass of α-particle 4.00260 amu.
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