Tokai to Kamioka
E561156
Tokai to Kamioka is a long-baseline neutrino oscillation experiment in Japan that studies how neutrinos change type as they travel from the J-PARC facility in Tokai to the Super-Kamiokande detector in Kamioka.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Tokai to Kamioka canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6010121 — 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: Tokai to Kamioka Context triple: [T2K, abbreviationFor, Tokai to Kamioka]
-
A.
Ibusuki
Ibusuki is a coastal city in Kagoshima Prefecture, Japan, best known for its natural hot springs and unique sand bath spas.
-
B.
Fujikawaguchiko
Fujikawaguchiko is a Japanese resort town in Yamanashi Prefecture known for its views of Mount Fuji and Lake Kawaguchi, hot springs, and access to Fuji Five Lakes.
-
C.
Minakami
Minakami is a mountainous town in Gunma Prefecture, Japan, known for its hot springs, outdoor sports, and scenic natural landscapes.
-
D.
Musashimurayama
Musashimurayama is a city in western Tokyo, Japan, known as part of the Tama area within the Tokyo Metropolis.
-
E.
Shōnan
Shōnan is a coastal region in Kanagawa Prefecture, Japan, known for its beaches, surf culture, and views of Enoshima and Mount Fuji.
- 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: Tokai to Kamioka Target entity description: Tokai to Kamioka is a long-baseline neutrino oscillation experiment in Japan that studies how neutrinos change type as they travel from the J-PARC facility in Tokai to the Super-Kamiokande detector in Kamioka.
-
A.
Ibusuki
Ibusuki is a coastal city in Kagoshima Prefecture, Japan, best known for its natural hot springs and unique sand bath spas.
-
B.
Fujikawaguchiko
Fujikawaguchiko is a Japanese resort town in Yamanashi Prefecture known for its views of Mount Fuji and Lake Kawaguchi, hot springs, and access to Fuji Five Lakes.
-
C.
Minakami
Minakami is a mountainous town in Gunma Prefecture, Japan, known for its hot springs, outdoor sports, and scenic natural landscapes.
-
D.
Musashimurayama
Musashimurayama is a city in western Tokyo, Japan, known as part of the Tama area within the Tokyo Metropolis.
-
E.
Shōnan
Shōnan is a coastal region in Kanagawa Prefecture, Japan, known for its beaches, surf culture, and views of Enoshima and Mount Fuji.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
neutrino oscillation experiment
ⓘ
particle physics experiment ⓘ |
| abbreviation | T2K NERFINISHED ⓘ |
| baselineLength | approximately 295 km ⓘ |
| beamEnergy | approximately 0.6 GeV peak energy ⓘ |
| beamlineType | conventional horn-focused neutrino beamline ⓘ |
| beamSourceLocation | Tokai, Ibaraki, Japan NERFINISHED ⓘ |
| collaborationSize | hundreds of scientists ⓘ |
| collaborationType | international collaboration ⓘ |
| country | Japan ⓘ |
| dataTakingStart | 2009 ⓘ |
| detectorLocation | Kamioka, Gifu, Japan NERFINISHED ⓘ |
| farDetector | Super-Kamiokande NERFINISHED ⓘ |
| farDetectorDepth | about 1,000 meters underground ⓘ |
| farDetectorMass | 50 kiloton water Cherenkov detector ⓘ |
| firstPhysicsResultsYear | 2011 ⓘ |
| fundingCountry | Japan NERFINISHED ⓘ |
| hostInstitution |
J-PARC
NERFINISHED
ⓘ
KEK NERFINISHED ⓘ University of Tokyo NERFINISHED ⓘ |
| locatedAlongBaseline | Honshu, Japan NERFINISHED ⓘ |
| nearDetector |
INGRID
NERFINISHED
ⓘ
ND280 NERFINISHED ⓘ |
| neutrinoBeamType |
muon neutrino beam
ⓘ
off-axis neutrino beam ⓘ |
| notableResult |
constraints on the CP-violating phase delta_CP
ⓘ
first indication of electron neutrino appearance from a muon neutrino beam ⓘ |
| primaryPhysicsGoal |
measure mass-squared difference delta m^2_32
ⓘ
measure mixing angle theta_13 ⓘ measure mixing angle theta_23 ⓘ measure neutrino oscillation parameters ⓘ |
| produces | pion and kaon secondaries to generate neutrinos ⓘ |
| protonBeamEnergy | 30 GeV ⓘ |
| researchFocus |
CP violation in the lepton sector
ⓘ
neutrino mass hierarchy constraints ⓘ |
| scientificDiscipline |
high-energy physics
ⓘ
neutrino physics ⓘ |
| studies |
electron neutrino appearance
ⓘ
muon neutrino disappearance ⓘ neutrino oscillations ⓘ |
| uses | proton accelerator at J-PARC ⓘ |
| usesBeamFrom | J-PARC NERFINISHED ⓘ |
| usesDetector | water Cherenkov detector ⓘ |
| usesDetectorTechnology |
electromagnetic calorimeters
ⓘ
fine-grained tracking detectors ⓘ time projection chambers ⓘ |
| usesTargetMaterial | graphite target ⓘ |
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: Tokai to Kamioka Description of subject: Tokai to Kamioka is a long-baseline neutrino oscillation experiment in Japan that studies how neutrinos change type as they travel from the J-PARC facility in Tokai to the Super-Kamiokande detector in Kamioka.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.