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Nagashima Lab
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The lab studies how exotic particles such as positrons interact with matter.
AboutAbout the lab
Exploring the interaction between exotic particles and matter
The Nagashima Lab conducts fundamental research on the interaction between positrons and matter.
The lab investigates what happens when exotic particles that do not normally exist in nature, such as positrons, are directed at matter.
The lab extends its findings to applied physics and also works on developing new experimental techniques that use positrons.
The research uses a "slow positron beam," a monoenergetic beam whose energy can be varied.
Key terms
- Positron
- The antiparticle of the electron. It can be produced, for example, by the β+ decay of radioactive isotopes.
- Slow positron beam
- A monoenergetic beam with variable energy, made by accelerating low-energy positrons emitted from a surface.
- Negative work function
- A property of a metal surface with respect to positrons, in which some of the positrons are spontaneously emitted from the surface.
NewsLab news
A doctoral student received the Student Presentation Encouragement Award at the Physical Society of Japan 2026 Spring Meeting
Paper: A paper on the observation of positronium diffraction was published in Nature Communications
A student received the Student Poster Prize at the international conference POSMOL2025
Paper: A paper on the photodetachment of the positronium negative ion was published in Physical Review Letters
ResearchResearch themes
The lab investigates the interaction between positrons and matter as basic research. Using slow positron beams, it works on topics such as the study of the positronium negative ion and the development of positronium beams.
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MembersFaculty
The Nagashima Lab consists of faculty members, doctoral, master's, and undergraduate students, and collaborating researchers.As of 2026
- ProfessorYasuyuki Nagashima
- Assistant ProfessorYuhi Sada
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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: “LIL-W with electron-positron converter” Laurent Guiraud / CC BY 4.0 (cropped)
- Probing matter with slow positron beams: “Particle accelerator DSC09089” David Monniaux / CC BY-SA 3.0 (cropped)
- Related lab (二国研究室): “Bose-Einstein Condensate (BEC) ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (佐中研究室): “Laser 01” Vislupus / CC BY-SA 4.0 (cropped)
- Related lab (吉原研究室): “Floor Standing Cryostat with DR Insert” OJB Quantum / CC BY 4.0 (cropped)
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