Bethe–Weizsäcker cycle
E75704
The Bethe–Weizsäcker cycle is a nuclear fusion process in stars, particularly massive ones, where hydrogen is converted into helium through a catalytic cycle involving carbon, nitrogen, and oxygen nuclei.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Bethe–Weizsäcker cycle canonical | 3 |
| CNO cycle | 3 |
| CNO-I cycle | 1 |
| CNO-II cycle | 1 |
| CNO-III cycle | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T604319 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
Target entity: Bethe–Weizsäcker cycle Context triple: [Hans Bethe, notableWork, Bethe–Weizsäcker cycle]
-
A.
Oppenheimer–Phillips process
The Oppenheimer–Phillips process is a nuclear reaction mechanism in which a deuteron interacting with a target nucleus effectively transfers its neutron while the proton is repelled, enabling certain reactions to occur at lower energies than would otherwise be required.
-
B.
X-10 graphite reactor
The X-10 graphite reactor was an early nuclear reactor at Oak Ridge, Tennessee, built during the Manhattan Project as a pilot plant for plutonium production and a key step toward the development of nuclear weapons and nuclear energy.
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C.
Chicago Pile-1
Chicago Pile-1 was the world’s first artificial nuclear reactor, achieving the first controlled, self-sustaining nuclear chain reaction in 1942 under the leadership of Enrico Fermi.
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D.
K-West Reactor
K-West Reactor is one of the plutonium production reactors at the Hanford Site in Washington State, historically used to support the U.S. nuclear weapons program.
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E.
Frisch–Peierls memorandum
The Frisch–Peierls memorandum was a pivotal 1940 document by physicists Otto Frisch and Rudolf Peierls that first outlined the feasibility of a small, practical uranium-based atomic bomb, helping to catalyze British and later Allied nuclear weapons research.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
Target entity: Bethe–Weizsäcker cycle Target entity description: The Bethe–Weizsäcker cycle is a nuclear fusion process in stars, particularly massive ones, where hydrogen is converted into helium through a catalytic cycle involving carbon, nitrogen, and oxygen nuclei.
-
A.
Oppenheimer–Phillips process
The Oppenheimer–Phillips process is a nuclear reaction mechanism in which a deuteron interacting with a target nucleus effectively transfers its neutron while the proton is repelled, enabling certain reactions to occur at lower energies than would otherwise be required.
-
B.
X-10 graphite reactor
The X-10 graphite reactor was an early nuclear reactor at Oak Ridge, Tennessee, built during the Manhattan Project as a pilot plant for plutonium production and a key step toward the development of nuclear weapons and nuclear energy.
-
C.
Chicago Pile-1
Chicago Pile-1 was the world’s first artificial nuclear reactor, achieving the first controlled, self-sustaining nuclear chain reaction in 1942 under the leadership of Enrico Fermi.
-
D.
K-West Reactor
K-West Reactor is one of the plutonium production reactors at the Hanford Site in Washington State, historically used to support the U.S. nuclear weapons program.
-
E.
Frisch–Peierls memorandum
The Frisch–Peierls memorandum was a pivotal 1940 document by physicists Otto Frisch and Rudolf Peierls that first outlined the feasibility of a small, practical uranium-based atomic bomb, helping to catalyze British and later Allied nuclear weapons research.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
CNO cycle
ⓘ
hydrogen burning process ⓘ stellar nuclear fusion process ⓘ |
| alsoKnownAs |
Bethe–Weizsäcker cycle
ⓘ
surface form:
CNO cycle
carbon–nitrogen–oxygen cycle ⓘ |
| betaDecayInvolves |
electron neutrino emission
ⓘ
positron emission ⓘ |
| comparedWith | proton–proton chain ⓘ |
| conserves | carbon-12 nucleus as a catalyst ⓘ |
| converts | hydrogen into helium ⓘ |
| dependsOn | metallicity of the star ⓘ |
| describedIn | stellar structure and evolution theory ⓘ |
| dominantIn |
high-temperature stellar interiors
ⓘ
massive main-sequence stars ⓘ |
| dominatesOver | proton–proton chain in high-mass stars ⓘ |
| energySourceFor | massive stars ⓘ |
| field |
astrophysics
ⓘ
nuclear physics ⓘ |
| hasSubprocess |
Bethe–Weizsäcker cycle
self-linksurface differs
ⓘ
surface form:
CNO-I cycle
Bethe–Weizsäcker cycle self-linksurface differs ⓘ
surface form:
CNO-II cycle
Bethe–Weizsäcker cycle self-linksurface differs ⓘ
surface form:
CNO-III cycle
|
| influences |
mass–luminosity relation for massive stars
ⓘ
stellar lifetimes of massive stars ⓘ |
| involves |
carbon-12
ⓘ
carbon-13 ⓘ nitrogen-13 ⓘ nitrogen-14 ⓘ nitrogen-15 ⓘ oxygen-15 ⓘ |
| mechanismType | catalytic cycle ⓘ |
| namedAfter |
Carl Friedrich von Weizsäcker
ⓘ
Hans Bethe ⓘ |
| netEffect |
four protons fused into one helium-4 nucleus
ⓘ
release of energy via mass–energy conversion ⓘ |
| occursIn | stellar cores ⓘ |
| partOf |
hydrogen burning in stars
ⓘ
stellar nucleosynthesis ⓘ |
| produces |
gamma rays
ⓘ
helium-4 ⓘ neutrinos ⓘ |
| reactionOrder | sequence of proton captures and beta decays ⓘ |
| requires | core temperatures above about 15 million kelvin ⓘ |
| role | explains energy generation in hot, massive stars ⓘ |
| temperatureSensitivity | strongly temperature dependent (approximately T^17 or higher in some regimes) ⓘ |
| timePeriodOfDevelopment | 1930s ⓘ |
| usesAsCatalyst |
carbon nuclei
ⓘ
nitrogen nuclei ⓘ oxygen nuclei ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Subject: Bethe–Weizsäcker cycle Description of subject: The Bethe–Weizsäcker cycle is a nuclear fusion process in stars, particularly massive ones, where hydrogen is converted into helium through a catalytic cycle involving carbon, nitrogen, and oxygen nuclei.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.