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Urca process

A cycle of nuclear reactions in which an electron is absorbed by a nucleus and is subsequently re-emitted as a beta particle (a fast electron) with the generation of a ...

Urca process

Urca process   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
104 words

...Urca process A process, first postulated by George Gamow (1904–68) and Mario Schoenberg (1914–90) in 1941, in which much of the large quantity of energy generated by the collapse of a large star to produce a neutron star ( see supernova ) is carried away by neutrinos . This process explains why stars can collapse rapidly rather than have this collapse delayed by the heat generated. Neutrinos created in this way have been detected. The Urca process is named after the Casino da Urca, which was a nightclub in Rio de Janeiro that Gamow and Schoenberg were...

Urca process

Urca process   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

... process A cycle of nuclear reactions in which an electron is absorbed by a nucleus and is subsequently re-emitted as a beta particle (a fast electron) with the generation of a neutrino–antineutrino pair. The process makes no change to the composition of the nucleus, but removes energy from it in the form of the neutrino and antineutrino. While insignificant in ordinary stars, it is important at very high densities and temperatures such as those which give rise to supernovae. The process is named after the Urca Casino in Rio de Janeiro, where it was said...

Urca process

Urca process  

A cycle of nuclear reactions in which an electron is absorbed by a nucleus and is subsequently re-emitted as a beta particle (a fast electron) with the generation of a neutrino–antineutrino pair. The ...

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