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Cosmic Ray Lab
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The lab uses physics to unravel the extreme universe with detectors it builds itself and with satellites.
AboutAbout the lab
Seeing the universe through physics, and seeing physics through the universe.
The Cosmic Ray Lab uses knowledge from physics to uncover the nature of the universe, and studies the extreme universe as a laboratory for physics.
Using observational data from X-ray and gamma-ray satellites, including the XRISM satellite, which carry detectors the lab has developed itself, the lab investigates the mysteries of supernova remnants, neutron stars, and the black hole at the Galactic center.
The lab designs and develops its own instruments and analyzes observational data, and it places great value on the experience of coming into direct contact with natural phenomena.
The lab also takes on research that can benefit the future of humanity, such as medical applications of radiation, radiation from thunderclouds, and exploration of water resources on the Moon.
Key terms
- Supernova remnant
- The expanding cloud of gas left behind after the massive explosion (supernova) that a star undergoes at the end of its life
- Neutron star
- An object made almost entirely of neutrons, the densest type of object in the universe
- XRISM satellite
- A Japanese X-ray astronomy satellite launched in 2023 that can measure the energy of X-rays in extremely fine detail
NewsLab news
Students received the top award and an excellence award at the XRISM Science Workshop for young researchers in 2026
A student received an Oral Award at the 56th Summer School of the Young Astronomers and Astrophysicists Meeting
A PhD student received an Outstanding Student Presentation Award at JpGU-AGU 2026
ResearchResearch themes
Centered on measurements of cosmic radiation, the lab conducts research on both observation and instrument development. Its projects include X-ray astronomy centered on the XRISM X-ray satellite, SMILE, which opens up gamma-ray astronomy using a balloon, MoMoTarO, which searches for water resources on the Moon, and a thundercloud project.
*Illustrative imageThe Origin of Elements and the History of the Galactic Center
The lab observes particle acceleration of cosmic rays in supernova remnants, as well as the composition of the elements produced up to the point of stellar explosions, to get at the origins of the elements and of cosmic rays. It also uses the XRISM satellite and other instruments to investigate the past activity of the black hole at the center of the Milky Way.
*Illustrative imageNeutron Stars: A Laboratory for Astrophysics
The lab studies neutron stars, where extreme physics that cannot be reproduced on Earth takes place, such as strong magnetic fields, strong gravity, and rapid rotation.
*Illustrative imageStellar Flares and Exoplanets
The lab studies stellar flares, in which energy stored in a star's magnetic field is suddenly released, through multi-wavelength observations in X-rays and visible light. It clarifies the mechanisms of flares and coronal mass ejections and explores their relationship to planet formation and planetary environments.
*Illustrative imageDetector Development for Satellites
New discoveries come from new observing instruments. The lab has developed the X-ray CCD cameras carried on the Suzaku and XRISM X-ray satellites. It is now developing a new X-ray SOI camera and next-generation X-ray satellites.
MembersFaculty
The members of the Cosmic Ray Lab are faculty members, researchers, and PhD and master's students.As of 2026
- ProfessorTakeshi Tsuru
- Visiting ProfessorToru Tamagawa
- Associate ProfessorTeruaki Enoto
- Associate ProfessorAtsushi Takada
- Assistant ProfessorHiroyuki Uchida
- Assistant ProfessorNaoki Tsuji
- Assistant ProfessorHiroki Yoneda
- Assistant ProfessorTomoshi Takeda
- Program-Specific Assistant ProfessorTakayuki Hayashi
- Program-Specific Assistant ProfessorKosuke Namekata
- Program-Specific Assistant ProfessorDOMINE Laura
- Program-Specific Assistant ProfessorSei Kato
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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: “XRISM 003” NASA's Goddard Space Flight Center Conceptual Image Lab / Public domain (cropped)
- The Origin of Elements and the History of the Galactic Center: “Supernova Remnant 3C 397” NASA/CXC/Univ of Manitoba/S.Safi-Harb et al, Optical: DSS, Infrared: NASA/JPL-Caltech / Public domain (cropped)
- Neutron Stars: A Laboratory for Astrophysics: “Neutron star magnetic fields simulation” NASA Jet propulsion laboratory / Public domain (cropped)
- Stellar Flares and Exoplanets: “Stellar flare hits HD 189733 b (artist's impression)” NASA, ESA, L. Calçada / CC BY 4.0 (cropped)
- Detector Development for Satellites: “XRISM s X-ray mirror assembly” NASA / Public domain (cropped)
- Related lab (宇宙グループ（基礎物理学研究所）
): “Subaru Telescope (840A5789-CC)” International Gemini Observatory/NOIRLab/NSF/AURA / CC BY 4.0 (cropped) - Related lab (恒星物理学（上田 佳宏）
): “Black hole's accretion disk” NASA’s Goddard Space Flight Center/Jeremy Schnittman / CC BY-SA 4.0 (cropped) - Related lab (理論宇宙物理学
（前田 啓一） ): “NASA’s Chandra Finds Possible Supernova Remnant” X-ray: NASA/CXC/UCLA/Z. Zhu et al.; ESA/XMM-Newton; Optical: PanSTARRS; Radio: MeerKAT; Infrared (JWST): NASA/ESA/CSA/STScI; Image Processing: NASA/CXC/SAO/L. Frattare and P. Edmonds / Public domain (cropped) - Related lab (銀河物理学
（岩室 史英） ): “Okayama observatory (Kyoto University)” GeeKay / Public domain (cropped)
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