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- Urca_process abstract "In astroparticle physics, an Urca process is a reaction which emits a neutrino and which is assumed to take part in cooling processes in neutron stars and white dwarfs. The process was first discussed by George Gamow and Mário Schenberg while they were visiting a casino named Cassino da Urca in Rio de Janeiro. Schoenberg is reported to have said to Gamow that "the energy disappears in the nucleus of the supernova as quickly as the money disappeared at that roulette table." In Gamow's South Russian dialect, urca can also mean a robber or gangster.The direct Urca processes are the simplest neutrino-emitting processes, and are thought to be central in the cooling of neutron stars. They have the general formwhere B1 and B2 are baryons, l is a lepton and νl (and νl) are (anti-)neutrinos. The baryons can be nucleons (free or bound), hyperons like Λ, Σ and Ξ, or members of the Δ isobar. The lepton is either an electron or a muon.The Urca process is especially important in the cooling of white dwarfs, where a lepton (usually an electron) is absorbed by the nucleus of an ion and then convectively carried away from the core of a star. Then, a beta decay occurs. Convection then carries the element back into the interior of the star, and the cycle repeats many times. Because the neutrinos emitted during this process are unlikely to be reabsorbed, this is effectively a cooling mechanism for white dwarfs.The process can also be essential in the cooling of neutron stars. If a neutron star contains a central core in which the direct Urca-process is operative, the cooling timescale shortens by many orders of magnitude.".
- Urca_process wikiPageID "3115920".
- Urca_process wikiPageLength "3480".
- Urca_process wikiPageOutDegree "18".
- Urca_process wikiPageRevisionID "672603110".
- Urca_process wikiPageWikiLink Astroparticle_physics.
- Urca_process wikiPageWikiLink Baryon.
- Urca_process wikiPageWikiLink Category:Astrophysics.
- Urca_process wikiPageWikiLink Electron.
- Urca_process wikiPageWikiLink George_Gamow.
- Urca_process wikiPageWikiLink Hyperon.
- Urca_process wikiPageWikiLink Isobar_(nuclide).
- Urca_process wikiPageWikiLink Lepton.
- Urca_process wikiPageWikiLink Muon.
- Urca_process wikiPageWikiLink Mário_Schenberg.
- Urca_process wikiPageWikiLink Neutrino.
- Urca_process wikiPageWikiLink Neutron_star.
- Urca_process wikiPageWikiLink Nucleon.
- Urca_process wikiPageWikiLink Rio_de_Janeiro.
- Urca_process wikiPageWikiLink White_dwarf.
- Urca_process wikiPageWikiLinkText "Urca process".
- Urca_process hasPhotoCollection Urca_process.
- Urca_process wikiPageUsesTemplate Template:Neutron_star.
- Urca_process wikiPageUsesTemplate Template:Reflist.
- Urca_process wikiPageUsesTemplate Template:Su.
- Urca_process wikiPageUsesTemplate Template:SubatomicParticle.
- Urca_process wikiPageUsesTemplate Template:Use_dmy_dates.
- Urca_process subject Category:Astrophysics.
- Urca_process hypernym Reaction.
- Urca_process type Disease.
- Urca_process type Astrophysic.
- Urca_process type Sub-discipline.
- Urca_process comment "In astroparticle physics, an Urca process is a reaction which emits a neutrino and which is assumed to take part in cooling processes in neutron stars and white dwarfs. The process was first discussed by George Gamow and Mário Schenberg while they were visiting a casino named Cassino da Urca in Rio de Janeiro.".
- Urca_process label "Urca process".
- Urca_process sameAs Proceso_Urca.
- Urca_process sameAs Urca-prosessi.
- Urca_process sameAs ウルカ過程.
- Urca_process sameAs Urca-prosesser.
- Urca_process sameAs Processo_Urca.
- Urca_process sameAs m.08sf2j.
- Urca_process sameAs Нейтринное_охлаждение.
- Urca_process sameAs Q2992247.
- Urca_process sameAs Q2992247.
- Urca_process sameAs 尤卡過程.
- Urca_process wasDerivedFrom Urca_process?oldid=672603110.
- Urca_process isPrimaryTopicOf Urca_process.