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Asaoka Lab (Super-Kamiokande/Hyper-Kamiokande)
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An astroparticle physics experiment lab that is building Hyper-Kamiokande to probe symmetry breaking (CP violation) in neutrinos.
AboutAbout the lab
Measuring particle phenomena directly.
The lab conducts experimental research in astroparticle physics.
After working on experiments that directly observe cosmic rays using balloons and the International Space Station, the lab has taken part in the Hyper-Kamiokande experiment since 2020.
The lab is now in charge of directing the construction site of Hyper-Kamiokande, working toward the start of the experiment.
Key terms
- Neutrino
- An elementary particle that is electrically neutral and barely interacts with other matter, which makes it difficult to observe
- Antineutrino
- The antiparticle paired with the neutrino. Slight differences in their properties are thought to be a clue to why matter remained in the universe
- Photomultiplier tube
- A device that converts very faint light into an electrical signal and amplifies it many times over so that it can be detected
ResearchResearch themes
Through the Hyper-Kamiokande project, which combines an upgrade of the accelerator that produces the neutrino beam with the construction of the Hyper-Kamiokande detector, the successor to Super-Kamiokande, the lab aims to measure the constants built into the physics of elementary particles in the most direct way possible.
*Illustrative imageConstruction of Hyper-Kamiokande
The lab directs the construction site of Hyper-Kamiokande, the successor to Super-Kamiokande. From the second half of fiscal 2026, it will work with collaborators around the world to carry out, in parallel, the installation of photomultiplier tubes and electronic circuits, as well as the assembly and operational testing of components.
*Illustrative imageDifferences Between Neutrinos and Antineutrinos
Using neutrino beams, the lab aims to directly capture the difference in behavior between neutrinos and antineutrinos (symmetry breaking, or CP violation). This research approaches the question of why the universe came to be made up only of matter.
MembersFaculty
- Associate ProfessorYoichi AsaokaPublications ↗
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images.
- Top image: “Hyper-Kamiokande scheme” Shota Izumiyama (Tokyo Inst. Tech.) for the Hyper-Kamiokande collaboration / CC BY 3.0 (cropped)
- Construction of Hyper-Kamiokande: “HK ID PMT” Jan Kisiel (Silesia U.) for the Hyper-Kamiokande collaboration / CC BY 4.0 (cropped)
- Differences Between Neutrinos and Antineutrinos: “HK experiment overview” Jan Kisiel (Silesia U.) for the Hyper-Kamiokande collaboration / CC BY 4.0 (cropped)
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