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There are various alternative paths and catalysts involved in the CNO cycles, but all these cycles have the same net result: 4 1 1 H + 2 e − → 4 2 He + 2 e + + 2 e − + 2 ν e + 3 γ + 24.7 MeV → 4 2 He + 2 ν e + 7 γ + 26.7 MeV
The ‘ CNO cycle’ refers to the Carbon-Nitrogen- Oxygen cycle, a process of stellar nucleosynthesis in which stars on the Main Sequence fuse hydrogen into helium via a six-stage sequence of reactions. This sequence proceeds as follows:
Der Bethe-Weizsäcker-Zyklus (auch CN-Zyklus, CNO-Zyklus, CNO-I-Zyklus, Kohlenstoff-Stickstoff-Zyklus) ist eine der acht Fusionsreaktionen des so genannten Wasserstoffbrennens, durch die Sterne Wasserstoff in Helium umwandeln; die anderen sind die Proton-Proton-Reaktion sowie weitere mögliche CNO-Zyklen, die allerdings bei noch ...
CNO cycle, sequence of thermonuclear reactions that provides most of the energy radiated by the hotter stars. It is only a minor source of energy for the Sun and does not operate at all in very cool stars. Four hydrogen nuclei are in effect converted into one helium nucleus, a fraction of the mass.
- The Editors of Encyclopaedia Britannica
In higher-mass stars, the dominant energy production process is the CNO cycle, which is a catalytic cycle that uses nuclei of carbon, nitrogen and oxygen as intermediaries and in the end produces a helium nucleus as with the proton-proton chain. CNO reaction is a very temperature sensitive process. [3] Under typical conditions found in stars ...
Abstract. Throughout most of their lives stars radiate energy that is produced by nuclear fusion. There are several subsequent fusion processes that a star can use to generate energy, starting with the fusion of H into He and ending with Si into Fe. We will describe the reaction chains for these processes and their energy production.
12. Dez. 2022 · December 12, 2022 • Physics 15, 190. A study of neutrinos from the Sun has measured the signal from the so-called CNO cycle, offering a direct measure of the elemental abundances in the Sun’s core. APS/ Alan Stonebraker. Figure 1: A representation of the CNO cycle.