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Tamii Lab
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An experimental nuclear physics lab that approaches the mysteries of the universe through the properties of atomic nuclei.
AboutAbout the lab
Exploring how the universe came to be through atomic nuclei.
The Tamii Lab (Fundamental Nuclear Physics Group) studies the properties of nuclear matter made of protons and neutrons, aiming to discover new phenomena and solve mysteries related to how the universe came to be.
Using the quantum beams and the “Grand Raiden” spectrometer at the Research Center for Nuclear Physics, Osaka University, the lab carries out joint research with leading research groups around the world.
The research covers the electric polarizability of atomic nuclei, the equation of state of neutron stars, and photodisintegration reactions of ultra-high-energy cosmic rays.
The lab also develops the detectors and data acquisition systems used in its experiments.
On the lab's website, it is also introduced under the name “Tamii Lab.”
Key terms
- Photonuclear reaction
- A reaction between light and an atomic nucleus. This is a reaction the lab pays particular attention to
- Neutron star
- A type of heavy celestial object left after a star burns out. It is often described as something like a giant atomic nucleus
- Equation of state
- The fundamental equation of matter. For nuclear matter, it indicates the strength of the repulsive force between nucleons
- Active target
- A device in which the target itself serves as a detector that can measure particle tracks. It works like a three-dimensional camera that captures the moment of reaction
ResearchResearch themes
The lab aims to clarify the properties of nuclear matter through experiments and to solve mysteries related to the formation and evolution of the universe. Along with detector development, it studies photonuclear reactions of cosmic rays, nuclear reactions in laser plasma, and the equation of state of nuclear matter.
*Illustrative imageUltra-high-energy cosmic rays and photonuclear reactions
The lab studies the reactions between light atomic nuclei and light (photonuclear reactions) that ultra-high-energy cosmic rays undergo as they travel through space. Experimental nuclear physics, theoretical nuclear physics, and astroparticle physics work together, and measurements using virtual photons are planned.
*Illustrative imageNuclear reactions in laser plasma
The lab is developing techniques to capture, by measuring gamma rays, the nuclear reactions that occur in the plasma produced when a high-intensity laser hits a solid target. It uses the J-KAREN-P laser, in collaboration with the Kansai Institute for Photon Science and the F Lab at Nagoya University.
*Illustrative imageEquation of state of nuclear matter and superfluidity
This project studies the structure and properties of macroscopic many-nucleon systems. The lab investigates the equation of state, the fundamental equation of matter, and fermion-pair condensed phases such as superfluidity and superconductivity.
*Illustrative imageActive targets that capture the moment of reaction
The lab is developing devices that work like three-dimensional cameras: the target itself becomes a detector that can measure particle tracks, capturing the moment when atomic nuclei react with each other. The first-generation CAT-S has been completed, and the second-generation CAT-M, with 10 times the measurement efficiency, is under construction.
MembersFaculty
The members of the Tamii Lab consist of faculty, master's and undergraduate students, a secretary, and support members who join from other groups at the Research Center for Nuclear Physics.As of 2026
- ProfessorAtsushi Tamii
- Associate ProfessorNobuyuki Kobayashi
- Assistant ProfessorJunki Tanaka
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: “ZEUS-Detektor” DESY-Kommunikation / CC BY-SA 4.0 (cropped)
- Ultra-high-energy cosmic rays and photonuclear reactions: “Crshower2 nasa” Simon Swordy / Public domain (cropped)
- Nuclear reactions in laser plasma: “Prague asterix laser system-interaction chamber” FDominec / CC BY-SA 4.0 (cropped)
- Equation of state of nuclear matter and superfluidity: “Neutron Star X-ray beaming with accretion disk” NASA / Public domain (cropped)
- Active targets that capture the moment of reaction: “ALICE TPC 1” Stefan A. Gärtner / CC BY-SA 3.0 (cropped)
- Related lab (川畑グループ（原子核実験）
): “Wu experiment at Bureau of Standards” A. V. Astin, Director, Bureau of Standards / Public domain (cropped) - Related lab (木村グループ（光物性グループ）
): “PES Hemispherical Analyzer” Ichwarsnur / CC BY-SA 4.0 (cropped) - Related lab (〈原子核実験 核物質サブグループ〉): “PRIME lab Van de Graaff accelerator” Patrick Finnegan / CC BY 2.0 (cropped)
- Related lab (原子核実験 核物質サブグループ（福田 光順）
): “VEP-1 collider” Eto shorcy / CC BY-SA 3.0 (cropped)
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