Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Triple-alpha_process> ?p ?o }
- Triple-alpha_process abstract "The triple-alpha process is a set of nuclear fusion reactions by which three helium-4 nuclei (alpha particles) are transformed into carbon.Older stars start to accumulate helium produced by the proton–proton chain reaction and the carbon–nitrogen–oxygen cycle in their cores. The products of further nuclear fusion reactions of helium with hydrogen or another helium nucleus produce lithium-5 and beryllium-8 respectively, both of which are highly unstable and decay almost instantly back into smaller nuclei. When the star starts to run out of hydrogen to fuse, the core of the star begins to collapse until the central temperature rises to 108 K (8.6 keV). At this point helium nuclei are fusing together faster than their product, beryllium-8, decays back into two helium nuclei.Once beryllium-8 is produced a little faster than it decays, the number of beryllium-8 nuclei in the stellar core increases to a large number. Then in its core there will be many beryllium-8 nuclei that can fuse with another helium nucleus to form carbon-12, which is stable:The net energy release of the process is 6988116600000000000♠1.166 pJ (7.273 MeV).Because the triple-alpha process is unlikely, it needs a long time to produce much carbon. One consequence of this is that no significant amount of carbon was produced in the Big Bang because within minutes after the Big Bang, the temperature fell below the critical point for nuclear fusion.Ordinarily, the probability of the triple alpha process is extremely small. However, the beryllium-8 ground state has almost exactly the energy of two alpha particles. In the second step, 8Be + 4He has almost exactly the energy of an excited state of 12C. These resonances greatly increase the probability that an incoming alpha particle will combine with beryllium-8 to form carbon. The existence of this resonance was predicted by Fred Hoyle before its actual observation, based on the physical necessity for it to exist, in order for carbon to be formed in stars. In turn, prediction and then discovery of this energy resonance and process gave very significant support to Hoyle's hypothesis of stellar nucleosynthesis, which posited that all chemical elements had originally been formed from hydrogen, the true primordial substance.As a side effect of the process, some carbon nuclei can fuse with additional helium to produce a stable isotope of oxygen and release energy: 126C + 42He → 168O + γ (+7.162 MeV)See alpha process for more details about this reaction and further steps in the chain of stellar nucleosynthesis.This creates a situation in which stellar nucleosynthesis produces large amounts of carbon and oxygen but only a small fraction of these elements is converted into neon and heavier elements. Both oxygen and carbon make up the 'ash' of helium-4 burning. The anthropic principle has been controversially cited to explain the fact that nuclear resonances are sensitively arranged to create large amounts of carbon and oxygen in the Universe.Fusion processes produce nuclides only up to nickel-56 (which decays later to iron); heavier elements (those beyond Ni) are created mainly by neutron capture. The slow capture of neutrons, the s-process, produces about half of these heavy elements. The other half are produced by rapid neutron capture, the r-process, which probably occurs in a core-collapse supernova.".
- Triple-alpha_process thumbnail Triple-Alpha_Process.png?width=300.
- Triple-alpha_process wikiPageID "93188".
- Triple-alpha_process wikiPageLength "14144".
- Triple-alpha_process wikiPageOutDegree "60".
- Triple-alpha_process wikiPageRevisionID "705416446".
- Triple-alpha_process wikiPageWikiLink Alpha_particle.
- Triple-alpha_process wikiPageWikiLink Alpha_process.
- Triple-alpha_process wikiPageWikiLink American_Physical_Society.
- Triple-alpha_process wikiPageWikiLink Angular_momentum_operator.
- Triple-alpha_process wikiPageWikiLink Anthropic_principle.
- Triple-alpha_process wikiPageWikiLink Big_Bang.
- Triple-alpha_process wikiPageWikiLink Big_Bang_nucleosynthesis.
- Triple-alpha_process wikiPageWikiLink CNO_cycle.
- Triple-alpha_process wikiPageWikiLink California_Institute_of_Technology.
- Triple-alpha_process wikiPageWikiLink Carbon.
- Triple-alpha_process wikiPageWikiLink Carbon-12.
- Triple-alpha_process wikiPageWikiLink Category:Nuclear_fusion.
- Triple-alpha_process wikiPageWikiLink Category:Nucleosynthesis.
- Triple-alpha_process wikiPageWikiLink Category:Stellar_physics.
- Triple-alpha_process wikiPageWikiLink Chemical_element.
- Triple-alpha_process wikiPageWikiLink Degenerate_matter.
- Triple-alpha_process wikiPageWikiLink Edwin_Ernest_Salpeter.
- Triple-alpha_process wikiPageWikiLink Electromagnetic_radiation.
- Triple-alpha_process wikiPageWikiLink Electronvolt.
- Triple-alpha_process wikiPageWikiLink Excited_state.
- Triple-alpha_process wikiPageWikiLink Fine-tuned_Universe.
- Triple-alpha_process wikiPageWikiLink Fred_Hoyle.
- Triple-alpha_process wikiPageWikiLink Galaxy.
- Triple-alpha_process wikiPageWikiLink Gamma_ray.
- Triple-alpha_process wikiPageWikiLink Helium.
- Triple-alpha_process wikiPageWikiLink Helium-4.
- Triple-alpha_process wikiPageWikiLink Helium_flash.
- Triple-alpha_process wikiPageWikiLink Hydrogen.
- Triple-alpha_process wikiPageWikiLink Iron.
- Triple-alpha_process wikiPageWikiLink Isotopes_of_beryllium.
- Triple-alpha_process wikiPageWikiLink Isotopes_of_lithium.
- Triple-alpha_process wikiPageWikiLink Isotopes_of_nickel.
- Triple-alpha_process wikiPageWikiLink Luminosity.
- Triple-alpha_process wikiPageWikiLink Multiverse.
- Triple-alpha_process wikiPageWikiLink Nuclear_fusion.
- Triple-alpha_process wikiPageWikiLink Nuclide.
- Triple-alpha_process wikiPageWikiLink Pair_production.
- Triple-alpha_process wikiPageWikiLink Power_(physics).
- Triple-alpha_process wikiPageWikiLink Proton–proton_chain_reaction.
- Triple-alpha_process wikiPageWikiLink R-process.
- Triple-alpha_process wikiPageWikiLink Red_giant.
- Triple-alpha_process wikiPageWikiLink Resonance_(particle_physics).
- Triple-alpha_process wikiPageWikiLink Rice_University.
- Triple-alpha_process wikiPageWikiLink S-process.
- Triple-alpha_process wikiPageWikiLink Solar_core.
- Triple-alpha_process wikiPageWikiLink Solar_luminosity.
- Triple-alpha_process wikiPageWikiLink Stellar_nucleosynthesis.
- Triple-alpha_process wikiPageWikiLink Thermal_runaway.
- Triple-alpha_process wikiPageWikiLink Type_II_supernova.
- Triple-alpha_process wikiPageWikiLink Van_de_Graaff_generator.
- Triple-alpha_process wikiPageWikiLink William_Alfred_Fowler.
- Triple-alpha_process wikiPageWikiLink File:Triple-Alpha_Process.png.
- Triple-alpha_process wikiPageWikiLinkText "He burning".
- Triple-alpha_process wikiPageWikiLinkText "Salpeter process".
- Triple-alpha_process wikiPageWikiLinkText "Triple-alpha process".
- Triple-alpha_process wikiPageWikiLinkText "burns helium".
- Triple-alpha_process wikiPageWikiLinkText "fusing helium".
- Triple-alpha_process wikiPageWikiLinkText "helium fusing".
- Triple-alpha_process wikiPageWikiLinkText "helium to carbon".
- Triple-alpha_process wikiPageWikiLinkText "helium-4 fusion".
- Triple-alpha_process wikiPageWikiLinkText "triple alpha reactions".
- Triple-alpha_process wikiPageWikiLinkText "triple alpha".
- Triple-alpha_process wikiPageWikiLinkText "triple-alpha fusion process of helium".
- Triple-alpha_process wikiPageWikiLinkText "triple-alpha process".
- Triple-alpha_process wikiPageWikiLinkText "triple-alpha".
- Triple-alpha_process wikiPageUsesTemplate Template:Citation_needed.
- Triple-alpha_process wikiPageUsesTemplate Template:Main.
- Triple-alpha_process wikiPageUsesTemplate Template:Nuclear_processes.
- Triple-alpha_process wikiPageUsesTemplate Template:Nuclide.
- Triple-alpha_process wikiPageUsesTemplate Template:Redirect-distinguish.
- Triple-alpha_process wikiPageUsesTemplate Template:Reflist.
- Triple-alpha_process wikiPageUsesTemplate Template:Subatomic_particle.
- Triple-alpha_process wikiPageUsesTemplate Template:Val.
- Triple-alpha_process subject Category:Nuclear_fusion.
- Triple-alpha_process subject Category:Nucleosynthesis.
- Triple-alpha_process subject Category:Stellar_physics.
- Triple-alpha_process hypernym Set.
- Triple-alpha_process type Astrophysic.
- Triple-alpha_process type Physic.
- Triple-alpha_process type Redirect.
- Triple-alpha_process type Thing.
- Triple-alpha_process comment "The triple-alpha process is a set of nuclear fusion reactions by which three helium-4 nuclei (alpha particles) are transformed into carbon.Older stars start to accumulate helium produced by the proton–proton chain reaction and the carbon–nitrogen–oxygen cycle in their cores.".
- Triple-alpha_process label "Triple-alpha process".
- Triple-alpha_process differentFrom Alpha_process.
- Triple-alpha_process sameAs Q336225.
- Triple-alpha_process sameAs تخليق_العناصر.
- Triple-alpha_process sameAs Тройна_хелиева_реакция.
- Triple-alpha_process sameAs ত্রি-আলফা_প্রক্রিয়া.
- Triple-alpha_process sameAs Procés_triple-alfa.
- Triple-alpha_process sameAs 3-alfa_reakce.
- Triple-alpha_process sameAs Tripel-alfa-processen.
- Triple-alpha_process sameAs Drei-Alpha-Prozess.
- Triple-alpha_process sameAs Proceso_triple-alfa.
- Triple-alpha_process sameAs فرایند_آلفا_سهگانه.