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Fujioka Lab
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An experimental nuclear physics lab that uses atomic nuclei to probe the properties of hadrons.
AboutAbout the lab
Do what no one has done before.
The Fujioka Lab studies nuclear physics, in the broad sense, through experiments.
The lab is distinctive in using atomic nuclei not as the object of study in themselves, but as a means of investigating the properties and interactions of hadrons, which are particles made up of quarks.
Since its founding, the lab has kept taking on new challenges under the keyword 'Let's do front-line research.'
Students who plan to find a job after finishing the master's program are also welcome.
Key terms
- Hadron
- A general term for particles made up of quarks, including protons, neutrons, and mesons.
- Hypernucleus
- A nucleus in which a particle containing a strange quark (a hyperon) has entered and become bound.
- Time-reversal symmetry
- The property that the laws of physics remain unchanged when the direction of time is reversed.
NewsLab news
View More ↗ResearchResearch themes
The lab uses atomic nuclei as a tool to experimentally investigate the properties of hadrons, which are made up of quarks, and the interactions between hadrons. Its research covers hypernuclei, antiprotons and antineutrons, mesic nuclei, symmetry violation in neutron reactions, and multi-neutron nuclei, and much of it is done in collaboration with universities and research institutes in Japan.
*Illustrative imageDouble-Λ Hypernuclei
The aim is to study hypernuclei in order to extend the understanding of the nuclear force to include hyperons. Together with the High Energy Accelerator Research Organization (KEK) and others, the lab is proposing a J-PARC experiment to search for hypernuclei containing two Λ particles.
*Illustrative imagePhysics of Antiprotons and Antineutrons
At the Antiproton Decelerator (AD) at CERN, the lab is considering X-ray spectroscopy of antiprotonic atoms and scattering experiments using antineutrons. It has also submitted a Letter of Intent for the experiment.
*Illustrative imageSearch for Mesic Nuclei
Inside atomic nuclei, the properties of hadrons are thought to differ from those in vacuum. To test the prediction that the mass of the η′ meson decreases, the lab is searching for bound states of an η′ meson and a nucleus, together with RIKEN and others.
*Illustrative imageProbing Symmetry Violation with Neutrons
It is known that symmetry violation is greatly amplified in reactions between neutrons and nuclei. The lab is working with Nagoya University and others on research that uses this reaction to search for violation of time-reversal symmetry.
MembersFaculty
The members of the Fujioka Lab consist of faculty, master's students, and undergraduate students.As of 2026
- Associate ProfessorHiroyuki FujiokaPublications ↗
- Assistant ProfessorUchida MakotoPublications ↗
VoicesStudent voices
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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. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “J-PARC Hadron Experimental Facility 1” Kestrel / CC BY-SA 4.0 (cropped)
- Double-Λ Hypernuclei: “J-PARC Hadron Experimental Facility 5” Kestrel / CC BY-SA 4.0 (cropped)
- Physics of Antiprotons and Antineutrons: “CERN Antimatter factory - antiproton decelerator” Suaudeau / CC BY-SA 4.0 (cropped)
- Search for Mesic Nuclei: “RIKEN Superconducting Ring Cyclotron P4213478” Kestrel / CC BY-SA 4.0 (cropped)
- Probing Symmetry Violation with Neutrons: “J-PARC Materials and Life Science Experimental Facility Experimental Hall No. 1 Neutron Instruments” Kestrel / CC BY-SA 4.0 (cropped)
- Related lab (慈道研究室): “Quantum Fluctuations” Derek Leinweber / CC BY-SA 4.0 (cropped)
- Related lab (高峰研究室): “NuclideMap stitched 2” NuclideMap.PNG: The viewer derivative work: Neokortex (talk) / Public domain (cropped)
- Related lab (中村研究室): “RIKEN Superconducting Ring Cyclotron P4213478” Kestrel / CC BY-SA 4.0 (cropped)
- Related lab (平原研究室): “Graphite-layers-side-3D-balls” Benjah-bmm27 / Public domain (cropped)
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