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helium nucleus

См. также в других словарях:

  • Helium fusion — is a kind of nuclear fusion, with the nuclei involved being helium.The fusion of helium 4 nuclei (alpha particles) is known as the triple alpha process, because fusion of just two helium nuclei only produces beryllium 8, which is unstable and… …   Wikipedia

  • Helium — He li*um (h[=e] l[i^]*[u^]m), n. [NL., fr. Gr. h lios the sun.] (Chem.) An inert, monoatomic, gaseous element occurring in the atmosphere of the sun and stars, and in small quantities in the earth s atmosphere, in several minerals and in certain… …   The Collaborative International Dictionary of English

  • Helium — otherusesHelium (He) is a colorless, odorless, tasteless, non toxic, inert monatomic chemical element that heads the noble gas group in the periodic table and whose atomic number is 2. Its boiling and melting points are the lowest among the… …   Wikipedia

  • Helium-3 — This article is about the elemental isotope. For the record label Helium 3, see Muse or A E Records .infobox isotope background = #F99 isotope name = Helium 3 alternate names =Helium 3,He 3 symbol =He mass number =3 mass =3.016 num neutrons =1… …   Wikipedia

  • helium — /hee lee euhm/, n. an inert, gaseous element present in the sun s atmosphere and in natural gas, and also occurring as a radioactive decomposition product, used as a substitute for flammable gases in dirigible balloons. Symbol: He; at. wt.:… …   Universalium

  • helium dating — Method of dating that depends on the production of helium during the decay of radioactive isotopes of uranium and thorium. Because of this decay, the helium content of any mineral or rock capable of retaining helium will increase during the… …   Universalium

  • Helium-4 — infobox isotope background = #F99 isotope name = Helium 4 alternate names =Helium 4,He 4 symbol =He mass number =4 mass =4.002602 num neutrons =2 num protons =2 abundance =99.999863% halflife =stable error halflife = text color = parent = parent… …   Wikipedia

  • Antiprotonic helium — An antiprotonic helium atom is a three body object composed of an antiproton and an electron orbiting around a helium nucleus. It is thus made partly of matter, and partly of antimatter. The atom is electrically neutral, since both electrons and… …   Wikipedia

  • Atomic nucleus — A figurative depiction of the helium 4 atom with the electron cloud in shades of gray. In the nucleus, the two protons and two neutrons are depicted in red and blue. This depiction shows the particles as separate, whereas in an actual helium atom …   Wikipedia

  • Isotopes of helium — Although there are eight known isotopes of helium (He) (standard atomic mass: 4.002602(2) u), only helium 3 (SimpleNuclide|Helium|3) and helium 4 (SimpleNuclide|Helium|4) are stable. In the Earth s atmosphere, there is one SimpleNuclide|Helium|3… …   Wikipedia

  • Halo nucleus — In nuclear physics, an atomic nucleus is called a halo nucleus or is said to have a nuclear halo if its radius is appreciably larger than that predicted by the liquid drop model, wherein the nucleus is assumed to be a sphere of constant density.… …   Wikipedia

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