helium-3
E125209
Helium-3 is a rare, light, non-radioactive isotope of helium valued for its role in nuclear fusion research and as a tracer in astrophysics and low-temperature physics.
All labels observed (1)
| Label | Occurrences |
|---|---|
| helium-3 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1083554 — 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: helium-3 Context triple: [Big Bang nucleosynthesis, produces, helium-3]
-
A.
Cavorite
Cavorite is a fictional anti-gravity material from H. G. Wells's novel "The First Men in the Moon," used to enable space travel to the Moon.
-
B.
Boric
Boric is the surname of Gabriel Boric, the Chilean politician who became one of the world’s youngest heads of state when he was elected President of Chile.
-
C.
S-50 thermal diffusion plant
The S-50 thermal diffusion plant was a World War II facility at Oak Ridge used in the Manhattan Project to enrich uranium through thermal diffusion as part of the U.S. atomic bomb program.
-
D.
Niton
Niton is a coastal village on the southern tip of the Isle of Wight in England, known for its scenic cliffs and rural character.
-
E.
Fermi
Fermi is a renowned Italian surname most famously associated with physicist Enrico Fermi, a pioneer of nuclear physics and Nobel Prize laureate.
- 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: helium-3 Target entity description: Helium-3 is a rare, light, non-radioactive isotope of helium valued for its role in nuclear fusion research and as a tracer in astrophysics and low-temperature physics.
-
A.
Cavorite
Cavorite is a fictional anti-gravity material from H. G. Wells's novel "The First Men in the Moon," used to enable space travel to the Moon.
-
B.
Boric
Boric is the surname of Gabriel Boric, the Chilean politician who became one of the world’s youngest heads of state when he was elected President of Chile.
-
C.
S-50 thermal diffusion plant
The S-50 thermal diffusion plant was a World War II facility at Oak Ridge used in the Manhattan Project to enrich uranium through thermal diffusion as part of the U.S. atomic bomb program.
-
D.
Niton
Niton is a coastal village on the southern tip of the Isle of Wight in England, known for its scenic cliffs and rural character.
-
E.
Fermi
Fermi is a renowned Italian surname most famously associated with physicist Enrico Fermi, a pioneer of nuclear physics and Nobel Prize laureate.
- F. None of above. chosen
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf |
bosonic superfluid precursor
ⓘ
chemical isotope ⓘ helium isotope ⓘ stable isotope ⓘ |
| atomicMass | 3.0160293 u ⓘ |
| boilingPointAt1atm | 3.19 K ⓘ |
| chemicalElement | helium ⓘ |
| color | colorless gas ⓘ |
| economicValue | high market value ⓘ |
| fermionOrBoson | fermion ⓘ |
| fusionReactionExample | D + ³He → ⁴He + p + 18.3 MeV ⓘ |
| fusionReactionPartner | deuterium ⓘ |
| fusionReactionType | aneutronic fusion candidate ⓘ |
| magneticMoment | nuclear magnetic moment used in NMR ⓘ |
| massNumber | 3 ⓘ |
| meltingPointAt1atm | 0.3 K (approximate, under pressure) ⓘ |
| naturalAbundanceInAtmosphere | trace ⓘ |
| naturalAbundanceInTerrestrialHelium | about 0.000137 ⓘ |
| neutronCaptureCrossSection | very high for thermal neutrons ⓘ |
| neutronDetectionReaction | n + ³He → ³H + p + 764 keV ⓘ |
| neutronNumber | 1 ⓘ |
| occursIn |
Earth atmosphere
ⓘ
lunar regolith ⓘ natural gas deposits ⓘ solar wind ⓘ |
| odor | odorless ⓘ |
| phaseBehavior |
exhibits superfluid phases at ultra-low temperatures
ⓘ
forms quantum fluids at millikelvin temperatures ⓘ |
| producedBy |
cosmic ray spallation
ⓘ
nuclear reactors ⓘ nuclear weapons programs ⓘ tritium decay ⓘ |
| protonNumber | 2 ⓘ |
| radioactivity | non-radioactive ⓘ |
| rarity | rare on Earth ⓘ |
| safety | non-toxic ⓘ |
| spin | 1/2 ⓘ |
| stability | stable ⓘ |
| studiedIn |
cosmology
ⓘ
stellar nucleosynthesis ⓘ |
| superfluidTransitionTemperature | about 2.5 mK to 3 mK depending on pressure ⓘ |
| symbol | ³He ⓘ |
| tracerRole |
tracer of primordial nucleosynthesis
ⓘ
tracer of solar wind implantation in lunar soils ⓘ |
| usedFor |
astrophysical tracer
ⓘ
cryogenics ⓘ low-temperature physics experiments ⓘ magnetic resonance imaging ⓘ neutron detection ⓘ neutron scattering instrumentation ⓘ nuclear fusion research ⓘ polarized gas targets ⓘ |
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: helium-3 Description of subject: Helium-3 is a rare, light, non-radioactive isotope of helium valued for its role in nuclear fusion research and as a tracer in astrophysics and low-temperature physics.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Big Bang nucleosynthesis