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Particle Beam Science Lab (Wakasugi)
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The lab investigates unstable nuclei using electron beams and a storage ring.
AboutAbout the lab
Measuring the shape and mass of nuclei that decay almost instantly.
The Particle Beam Science Lab (Wakasugi Lab) uses accelerator technology to study the structure and mass of unstable nuclei.
Using electron scattering with high-energy electron beams, the lab studies the structure of unstable nuclei in which the balance between the numbers of protons and neutrons has been lost.
The lab also works on precisely measuring, at world-record speed, the masses of short-lived nuclei that are produced only very rarely, using a heavy-ion storage ring.
The lab is located at the Institute for Chemical Research (Uji Campus) and participates as a cooperating research group in Physics II (Beam Physics Subgroup).
Key terms
- Unstable nuclei
- Nuclei in which the balance between the numbers of protons and neutrons is lost, so that they decay quickly
- Electron scattering
- A method in which electrons are shot at a material and the shape and charge distribution of the nucleus are examined from how the electrons scatter
- Storage ring
- An accelerator that confines particles in a circular orbit and keeps them circulating
ResearchResearch themes
The lab studies the structure and mass of unstable nuclei using electron scattering with high-energy electron beams and a heavy-ion storage ring. It also develops the accelerator technology and the ion transport and trapping technology needed for this work.
*Illustrative imageElectron Scattering off Unstable Nuclei (SCRIT)
The lab has developed SCRIT, a device that traps target ions using the electric field created by the electron beam itself, and aims to realize electron scattering with short-lived unstable nuclei as targets. An SCRIT electron scattering facility is being built at RIKEN.
*Illustrative imageMeasuring Photonuclear Reactions with Ultra-Forward Electron Scattering
By combining the SCRIT method with measurement of ultra-forward scattered electrons, the lab aims to study photonuclear reactions on unstable nuclei as targets. This is expected to reveal the existence of triaxially deformed nuclei.
*Illustrative imagePrecision Measurement of the Proton Radius (ULQ2)
This experiment measures the size of the proton's charge distribution by a method never used before. It has been found that the values obtained from electron scattering and hydrogen spectroscopy differ by as much as 4% from the value obtained with a new method using muons, and follow-up experiments are being carried out around the world.
*Illustrative imageMeasuring the Masses of Rare Radioactive Isotopes (RI) at World-Record Speed
To investigate where heavy elements are produced, the lab precisely measures the masses of short-lived unstable nuclei that are produced only very rarely, using the heavy-ion storage ring R3, within the roughly one-thousandth of a second that they survive.
MembersFaculty
The members of the Particle Beam Science Lab consist of faculty, technical staff, secretaries, and doctoral and master's students.As of 2026
- ProfessorMasanori Wakasugi
- Associate ProfessorKyo Tsukada
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: “ASTRID-Storage-Ring-2010” Nykj / CC BY-SA 3.0 (cropped)
- Electron Scattering off Unstable Nuclei (SCRIT): “Time dilation setup at test storage ring at MPIK” Sreinha1 / CC BY-SA 3.0 (cropped)
- Measuring Photonuclear Reactions with Ultra-Forward Electron Scattering: “Melbourne University 35MeV Betatron” Suzie Sheehy / CC BY-SA 4.0 (cropped)
- Precision Measurement of the Proton Radius (ULQ2): “Protons e neutrons” Matheus Viana .O / CC BY-SA 4.0 (cropped)
- Measuring the Masses of Rare Radioactive Isotopes (RI) at World-Record Speed: “ESR cooling COOL2019” M. Steck, C. Dimopoulou, R. Hess, R. Joseph, S.A. Litvinov, B. Lorentz, J. Roßbach, D.F.A. Winters / CC BY 3.0 (cropped)
- Related lab (Tokita Lab): “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped)
- Related lab (Nuclear Beam Condensed Matter Physics Lab): “NuclideMap small preview” The viewer / Public domain (cropped)
- Related lab (Nuclear and Hadron Lab): “J-PARC Main Ring accelerator RF Cavity” Kestrel / CC BY-SA 4.0 (cropped)
- Related lab (Tochio Lab (Structural Physiology Subdivision, Department of Biophysics, Graduate School of Science, Kyoto University)): “Protein HMOX2 PDB 2q32” Emw / CC BY-SA 3.0 (cropped)
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