Szilard–Chalmers effect
E94910
The Szilard–Chalmers effect is a nuclear chemistry phenomenon in which atoms that undergo neutron capture and become radioactive are chemically separated from their original, non-activated atoms due to recoil-induced disruption of their chemical bonds.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Szilard–Chalmers effect canonical | 2 |
| Hevesy–Chalmers effect | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T797273 — 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.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Szilard–Chalmers effect Context triple: [Leo Szilard, knownFor, Szilard–Chalmers effect]
-
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.
Hanbury Brown and Twiss effect
The Hanbury Brown and Twiss effect is a quantum optical phenomenon in which correlations in the arrival times of identical particles, such as photons, reveal their underlying statistical and coherence properties.
-
C.
de Haas–van Alphen effect
The de Haas–van Alphen effect is a quantum oscillatory phenomenon in metals where the magnetization varies periodically with applied magnetic field, allowing precise mapping of the electronic structure and Fermi surface.
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D.
Meissner effect
The Meissner effect is the phenomenon in which a superconductor expels magnetic fields from its interior when cooled below its critical temperature, leading to perfect diamagnetism.
-
E.
Teller–Ulam design
The Teller–Ulam design is the standard two-stage thermonuclear weapon architecture that enables the immense explosive power of modern hydrogen bombs through radiation-driven compression of a secondary fusion stage.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Szilard–Chalmers effect Target entity description: The Szilard–Chalmers effect is a nuclear chemistry phenomenon in which atoms that undergo neutron capture and become radioactive are chemically separated from their original, non-activated atoms due to recoil-induced disruption of their chemical bonds.
-
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.
Hanbury Brown and Twiss effect
The Hanbury Brown and Twiss effect is a quantum optical phenomenon in which correlations in the arrival times of identical particles, such as photons, reveal their underlying statistical and coherence properties.
-
C.
de Haas–van Alphen effect
The de Haas–van Alphen effect is a quantum oscillatory phenomenon in metals where the magnetization varies periodically with applied magnetic field, allowing precise mapping of the electronic structure and Fermi surface.
-
D.
Meissner effect
The Meissner effect is the phenomenon in which a superconductor expels magnetic fields from its interior when cooled below its critical temperature, leading to perfect diamagnetism.
-
E.
Teller–Ulam design
The Teller–Ulam design is the standard two-stage thermonuclear weapon architecture that enables the immense explosive power of modern hydrogen bombs through radiation-driven compression of a secondary fusion stage.
- F. None of above. chosen
Statements (39)
| Predicate | Object |
|---|---|
| instanceOf |
nuclear chemistry phenomenon
ⓘ
radiochemical effect ⓘ |
| appliesTo |
gamma-activated atoms
ⓘ
neutron-activated atoms ⓘ |
| cause | recoil of nucleus after neutron capture ⓘ |
| characteristic |
chemical behavior of activated atoms differs from bulk target
ⓘ
depends on recoil energy of product nucleus ⓘ depends on strength of chemical bonds in target compound ⓘ |
| describes | separation of activated atoms from non-activated atoms ⓘ |
| discoveredBy |
Leó Szilárd
ⓘ
linked to:
Leo Szilard
Thomas A. Chalmers ⓘ |
| discoveryYear | 1934 ⓘ |
| effect |
activated atoms leave original chemical compound
ⓘ
enrichment of radioactive isotopes in a different chemical fraction ⓘ |
| field |
nuclear chemistry
ⓘ
radiochemistry ⓘ |
| hasConsequence |
change in chemical form of product nuclide
ⓘ
spatial redistribution of radioactive atoms in a sample ⓘ |
| involvesProcess |
chemical bond disruption
ⓘ
chemical separation ⓘ neutron capture ⓘ nuclear recoil ⓘ radioactivation ⓘ |
| namedAfter |
Leó Szilárd
ⓘ
linked to:
Leo Szilard
Thomas A. Chalmers ⓘ |
| occursIn |
liquid targets
ⓘ
solid targets ⓘ |
| relatedTo |
hot atom chemistry
ⓘ
neutron activation analysis ⓘ recoil chemistry ⓘ |
| requires | irradiation with neutrons or other particles ⓘ |
| theoreticalBasis |
conservation of momentum in nuclear reactions
ⓘ
interaction between nuclear processes and chemical bonds ⓘ |
| usedFor |
isotope separation
ⓘ
production of carrier-free radioisotopes ⓘ radiotracer preparation ⓘ |
| usedIn |
fundamental studies of chemical bonding under irradiation
ⓘ
radioisotope production for medicine ⓘ radioisotope production for research ⓘ |
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.
Instruction
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.
Input
Subject: Szilard–Chalmers effect Description of subject: The Szilard–Chalmers effect is a nuclear chemistry phenomenon in which atoms that undergo neutron capture and become radioactive are chemically separated from their original, non-activated atoms due to recoil-induced disruption of their chemical bonds.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Szilard–Chalmers effect