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Fundamental Nuclear Physics Lab (Toyonaka Facility, Tamii Lab)
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A nuclear physics lab that explores how the universe came to be through the properties of atomic nuclei.
AboutAbout the lab
From the properties of nuclei to the mysteries of the universe.
The Fundamental Nuclear Physics Group (Tamii Lab) studies the properties of nuclear matter made of protons and neutrons, aiming to solve mysteries related to the formation and evolution of the universe.
Its research covers the photodisintegration of ultra-high-energy cosmic rays, the equation of state of neutron stars, Big Bang nucleosynthesis, and more.
The lab uses the quantum beams and the "Grand Raiden" spectrometer at the Research Center for Nuclear Physics, Osaka University, and also collaborates with research groups abroad.
It also develops the detectors and data acquisition systems used in its experiments.
Key terms
- Photonuclear reaction
- A phenomenon in which light and an atomic nucleus react. It is the reaction this lab focuses on in particular.
- Neutron star
- An object formed after a star burns out. It is thought to be like a giant atomic nucleus.
- Equation of state
- The fundamental equation of matter. For nuclear matter, it indicates how strong the repulsive force between nucleons is.
- Active target
- A device in which the target itself serves as a detector that measures particle tracks. It works like a three-dimensional camera that captures the moment of a reaction.
ResearchResearch themes
The lab aims to solve mysteries related to the formation and evolution of the universe through the properties of nuclear matter made of protons and neutrons. It focuses in particular on photonuclear reactions, which are reactions between light and nuclei, and investigates the equation of state of neutron stars, Big Bang nucleosynthesis, and more.
*Illustrative imagePANDORA: Exploring Cosmic Rays and Photonuclear Reactions
Ultra-high-energy cosmic rays are thought to change in energy and composition through photonuclear reactions with the afterglow of the Big Bang while they travel between galaxies. Experimental nuclear physics, theoretical nuclear physics, and astroparticle physics work together to study photonuclear reactions of light nuclei.
*Illustrative imageNuclear Reactions in Laser Plasma
When a high-intensity laser hits a solid target, a high-energy, high-density field in which nuclear reactions can occur forms for an instant. To detect nuclear reactions in this field, the lab is developing techniques to measure gamma rays from the plasma, jointly with the Kansai Photon Science Institute and the F Lab at Nagoya University.
*Illustrative imageEquation of State and Superfluidity of Nucleon Many-Body Systems
This project investigates the structure and properties of systems in which many protons and neutrons (nucleons) gather. It studies the equation of state, the fundamental equation of matter, as well as superfluidity and superconductivity, which are fermion pair condensed phases.
*Illustrative imageCAT, an Active Target That Captures the Moment of Reaction
The lab is developing the Active Target System CAT, a three-dimensional camera that captures the moment nuclei react by turning the target itself into a detector that can measure particle tracks. The aim is to study the incompressibility of nuclei (how easily they are squashed), which is considered important for determining the structure of neutron stars.
MembersFaculty
The Fundamental Nuclear Physics Group consists of faculty members, doctoral, master's, and undergraduate students, and secretaries.As of 2026
- ProfessorAtsushi Tamii
- Associate ProfessorNobuyuki Kobayashi
- Assistant ProfessorJunki Tanaka
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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: “Institute of nuclear and particle physics 00048 REP SDR-73 (0693)” DimitrisSideridis / CC BY-SA 4.0 (cropped)
- PANDORA: Exploring Cosmic Rays and Photonuclear Reactions: “Gamma-ray-burst-illustration” NASA/Dana Berry / Public domain (cropped)
- Nuclear Reactions in Laser Plasma: “Nuclear Reaction In the Sun” US Department of Energy / Public domain (cropped)
- Equation of State and Superfluidity of Nucleon Many-Body Systems: “Liquid helium Rollin film” I, AlfredLeitner, took this photograph as part of my movie "Liquid Helium,Superfluid" / Public domain (cropped)
- CAT, an Active Target That Captures the Moment of Reaction: “ALICE TPC 1” Stefan A. Gärtner / CC BY-SA 3.0 (cropped)
- Related lab (Particle and Nuclear Reaction Group (J-PARC Charm Hadron Spectroscopy Experiment) Lab): “J-PARC Hadron Experimental Facility 4” Kestrel / CC BY-SA 4.0 (cropped)
- Related lab (Particle and Nuclear Reaction Group (Laser Electron Photon Experiments LEPS/LEPS2) Lab): “Columbia University Nevis Lab linear particle accelerator, beam injector. (photo mosaic)” CUBIST DEBRIS / CC BY-SA 4.0 (cropped)
- Related lab (Elementary Particle and Nuclear Reaction Lab (Double Beta Decay Experiment CANDLES)): “MINERvA Neutrino Detector 2011” KeysPhotography.com / CC BY-SA 4.0 (cropped)
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