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Fundamental Particle Physics (F) Lab
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A lab that photographs the tracks of elementary particles with nuclear emulsion to approach the mysteries of neutrinos and dark matter.
AboutAbout the lab
Photographing the paths that elementary particles leave behind.
The Fundamental Particle Physics Lab (F Lab) studies elementary particles and the universe using nuclear emulsion, a photographic film on which elementary particles can be observed.
The lab works on neutrino research, searches for unknown particles that are candidates for dark matter, and observations of cosmic gamma rays with a balloon-borne telescope.
The lab independently develops both the photographic emulsion that serves as the material for nuclear emulsion and the microscopes that automatically read the recorded tracks.
It is also advancing research that applies this technology to other fields, such as neutron measurement.
Key terms
- Nuclear emulsion
- A photographic film that records the paths of elementary particles and radiation in three dimensions, with a precision finer than 1 micron.
- Neutrino
- An elementary particle that has no electric charge and an extremely small mass.
- Dark matter
- Matter that is thought to have mass but emits no light, and whose identity is unknown.
NewsLab news
A student received the Student Excellent Presentation Award at the 68th Symposium on Radiation Chemistry
A student received the Excellent Poster Presentation Award at the workshop of the Transformative Research Areas (A) "Origin and Evolution of Cosmic Matter Explored through Extremely Rare Events"
A student received the Student Oral Presentation Award at the Annual Meeting of the Society of Photographic Science and Technology of Japan
Neutrino interaction rate in the TeV range measured in the FASER international collaboration (Physical Review Letters)
ResearchResearch themes
Using technology it has developed independently, the lab aims to open up territory no one has explored before and to elucidate natural phenomena. With nuclear emulsion, which records the paths of elementary particles and radiation, it studies neutrinos, dark matter, gamma-ray sources, and more.
*Illustrative imagePrecision Measurement of Neutrino Interactions
To investigate the difference between the properties of neutrinos and antineutrinos (CP violation), we need to know neutrino interactions in more detail than ever before. The lab is carrying out the NINJA experiment, which uses the J-PARC neutrino beam and nuclear emulsion to measure these interactions precisely.
*Illustrative imageSearch for Dark Matter with Directional Sensitivity
The lab has independently developed ultra-fine-grained nuclear emulsion that can record the short tracks, several hundred nm long, left by nuclei knocked by dark matter. Through international collaboration, it is carrying out the NEWSdm experiment, which detects dark matter signals from the direction of these tracks.
*Illustrative imageObserving Cosmic Gamma Rays with Balloons
The GRAINE project carries a telescope made of nuclear emulsion on a large balloon to observe cosmic gamma rays at altitudes above 35 km. Aiming to image gamma-ray sources at the highest resolution in the world, the lab repeatedly conducts balloon experiments in cooperation with JAXA.
*Illustrative imageDevelopment of Nuclear Emulsion and Readout Systems
The lab independently develops the photographic emulsion that serves as the material for nuclear emulsion, and a microscope system (track readout system) that automatically reads, at high speed, the tracks recorded on the plates.
MembersFaculty
The members of the F Lab consist of staff, students in the doctoral, master's, and fourth-year undergraduate programs, visiting researchers, and secretaries.As of 2026
- Associate ProfessorToshiyuki Nakano
- Project Associate ProfessorOsamu Sato
- Project Assistant ProfessorNaotaka Naganawa
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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: “Fermilab g-2 (E989) ring” Reidar Hahn / CC BY-SA 4.0 (cropped)
- Precision Measurement of Neutrino Interactions: “Neutrino detector - National Museum of Nature and Science, Tokyo - DSC07824” Daderot / CC0 (cropped)
- Search for Dark Matter with Directional Sensitivity: “Measurment of the underground inside the Felsenkeller shallow-underground accelerator laboratory during installation phase 01” Yeti-Hunter / CC BY-SA 4.0 (cropped)
- Observing Cosmic Gamma Rays with Balloons: “The Scientific balloon eclipses the sun as it fills with helium, and the High Altitude Student Platform awaits launch (GSFC2024HASP0202)” NASA Goddard Space Flight Center / Sophia Roberts / Public domain (cropped)
- Development of Nuclear Emulsion and Readout Systems: “Photographic darkroom, probably Geoff Charles's darkroom, Bangor (1532108)” Geoff Charles / CC BY-SA 4.0 (cropped)
- Related lab (Cosmic Ray Physics (CR) Lab): “The Alpha Magnetic Spectrometer (AMS), a cosmic particle detector (iss075e0086247)” NASA Johnson Space Center / Public domain (cropped)
- Related lab (Astrophysics (A) Lab): “CSIRO ScienceImage 559 Radio Telescopes at the Australia Telescope Compact Array” division, CSIRO / CC BY 3.0 (cropped)
- Related lab (Elementary Particle Theory (E) Lab): “Fermilab - CDF detector rolling in for run 2” 作者不詳 / Public domain (cropped)
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