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Kazama Lab
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A lab that searches for the identity of invisible dark matter using liquid xenon detectors.
AboutAbout the lab
Taking on the mysteries of dark matter and the universe.
The Kazama Lab uses experiments to investigate the nature of dark matter, which cannot be seen with light.
Using data from XENONnT, one of the world's largest liquid xenon experiments, operating underground in Italy, the lab searches for dark matter and rare phenomena.
Within the university, the lab is also developing detectors with extremely low radioactivity for XLZD, a future large-scale experiment.
The lab is a small group that started in April 2026, and it welcomes consultations about research from students of any year.
Key terms
- Dark matter
- Matter thought to make up most of the mass of the universe, but which cannot be seen with light and whose nature is still unknown
- Liquid xenon detector
- A device that reads out the light and electrons produced when a particle interacts in liquefied xenon, in order to determine its position and energy
- Background events
- Unwanted reactions, caused by radioactive materials and the like, that get mixed in with the signal being searched for
NewsLab news
First observation of electron scattering of low-energy solar neutrinos in the XENONnT experiment
Consultations on research and lab life open to students of any year
Research results on XENONnT measurement of solar 8B neutrinos released
Lab launched at Institute of Science Tokyo
ResearchResearch themes
The lab searches for dark matter using liquid xenon detectors, aiming to uncover the physics behind it. It is also developing ultra-low-radioactivity detectors in-house at the university for the future XLZD experiment.
*Illustrative imageDark matter search with XENONnT
Using data from XENONnT, which operates at an underground facility in Italy, the lab searches for dark matter by evaluating background events and modeling the detector response. It also works on observing low-energy neutrinos.
*Illustrative imageSealed liquid xenon detector
For XLZD, the lab is developing a detector whose central part is sealed with synthetic quartz to keep radon and tritium from getting in. It has demonstrated that radon can be shut out in gaseous xenon.
*Illustrative imageUltra-low-radioactivity photodetectors
The lab is making photomultiplier tubes and silicon photomultipliers less radioactive and higher performing, and is also building a new type of light sensor that combines the two. Development is carried out jointly with Hamamatsu Photonics.
*Illustrative imageMeasuring trace impurities
The lab is also advancing a method for measuring trace amounts of hydrogen, to quantitatively evaluate tritium-induced events, and a method for measuring trace amounts of uranium and thorium contained in PTFE, a light-reflecting material.
MembersFaculty
The Kazama Lab's members consist of faculty, postdocs, and undergraduate students.As of 2026
- Associate ProfessorShingo KazamaPublications ↗
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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: “Xenon-glow” Jurii / CC BY 3.0 (cropped)
- Dark matter search with XENONnT: “Large Underground Xenon detector inside watertank” Gigaparsec (English Wikipedia) / CC BY 3.0 (cropped)
- Sealed liquid xenon detector: “Liquid xenon” Lotus 50 / CC BY-SA 4.0 (cropped)
- Ultra-low-radioactivity photodetectors: “Photomultiplier Tube (PMT)” Motokoka / CC BY-SA 4.0 (cropped)
- Measuring trace impurities: “Uraninite w11” Weirdmeister / CC BY-SA 4.0 (cropped)
- Related lab (久世研究室): “Views of the LHC tunnel sector 3-4, tirage 2” Maximilien Brice (CERN) / CC BY-SA 3.0 (cropped)
- Related lab (陣内研究室): “CERN LHC ATLAS Detector” SimonWaldherr / CC BY-SA 4.0 (cropped)
- Related lab (素粒子論研究室
（伊藤・ 今村研究室） ): “CalabiYau5” Andrew J. Hanson / CC BY-SA 3.0 (cropped) - Related lab (山口研究室): “WMAP 2012” NASA / WMAP Science Team / Public domain (cropped)
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