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The CNO cycle (for carbon – nitrogen – oxygen; sometimes called Bethe–Weizsäcker cycle after Hans Albrecht Bethe and Carl Friedrich von Weizsäcker) is one of the two known sets of fusion reactions by which stars convert hydrogen to helium, the other being the proton–proton chain reaction (p–p cycle), which is more efficient at the Sun 's core te...
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
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 höheren Temperatur...
Der BETHE-WEIZSÄCKER- oder CNO-Zyklus (nach den Elementen Kohlenstoff-Stickstoff-Sauerstoff, die als "Katalysator" wirken) wurde zwischen 1937 und 1939 von den Physikern Hans BETHE (1906 - 2005) und Carl Friedrich von WEIZSÄCKER (1912 - 2007) entdeckt.
CNO cycle. 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: A carbon-12 nucleus captures a proton and emits a gamma ray, producing nitrogen-13.
CNO cycle. Triple-α process. Combined energy generation of PP and CNO within a star. The Sun's core temperature, at which PP is more efficient. In astrophysics, stellar nucleosynthesis is the creation of chemical elements by nuclear fusion reactions within stars.
5. Feb. 2018 · This means that hydrogen burning would not be characterized by just a single cycle, but a bi-cycle, the so-called CNO cycle. The significance is that beside 12 C, the presence of 16 O in the interior of the star could be an additional source of energy.
