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alfa-čestica

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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  • ส่วนหนึ่งของคำพูด: noun
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  • อุตสาหกรรม/ขอบเขต: Astronomy
  • Category: General astronomy
  • Company: Caltech
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alfa čestica
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(image) the nucleus of a helium atom, made up of two neutrons and two protons with a charge of +2. Certain radioactive nuclei emit alpha particles. Alpha particles generally carry ...

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a tiny mass of material.

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soft, silvery-white, radioactive metal which glows in the dark

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See definition for m 2 , above.

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The magnitude value measured (or predicted) for a comet's nuclear condensation. Note that the true comet nucleus is rarely, if ever, directly observed from the earth because of ...

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