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Cosmic Ray Physics (CR) Lab
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The lab uses cosmic rays to explore elementary particles and the space and Earth environment.
AboutAbout the lab
Looking at elementary particles and the universe through cosmic rays
The Cosmic Ray Physics (CR) Lab uses cosmic rays that rain down on Earth from space as clues to study elementary particles, high-energy phenomena in the universe, and the space and Earth environment.
Cosmic ray physics is a field that spans three areas: astrophysics, particle and nuclear physics, and geophysics.
The lab conducts experimental research across a wide range of fields, from accelerator physics to astrophysics and the Earth's environment.
The lab's abbreviation, CR, comes from the initials of the English words cosmic rays.
Key terms
- Cosmic rays
- Radiation that rains down on Earth from space. Its main component is protons, and it also includes electrons, atomic nuclei, gamma rays, and neutrinos
- Neutrino
- An elementary particle that hardly interacts with matter. It is thought to be a key to solving the mysteries of the birth of the universe and the origin of matter
- Dark matter
- Matter whose identity is still unknown. Its discovery and elucidation are thought to be key to understanding the birth and history of the universe
- Carbon-14
- One of the isotopes produced by cosmic rays. Contained in tree rings and ice cores, it provides clues to past variations in cosmic rays and solar activity
ResearchResearch themes
Cosmic rays bring information about unknown elementary particles and high-energy phenomena in the universe, and because they are affected by magnetic fields, they also serve as clues for investigating the space and Earth environment. Spanning a wide range from particle and nuclear physics to astrophysics and geophysics, the lab has a variety of research themes.
*Illustrative imageLHCf/RHICf Experiments
The lab studies the reactions in which high-energy cosmic rays collide with Earth's atmosphere and produce secondary particles, reproducing them with the large accelerators LHC and RHIC. This contributes to clarifying the origin and acceleration mechanisms of ultra-high-energy cosmic rays.
*Illustrative imageProperties and Searches of Neutrinos
Participating in the Super-Kamiokande experiment, the lab studies the properties of neutrinos. It also searches for neutrinos produced by dark matter annihilation and neutrinos from high-energy astronomical objects.
*Illustrative imageMeasuring Carbon-14 in Tree Rings
The lab measures carbon-14 in ancient tree rings at one-year resolution to investigate past solar magnetic activity and traces of extremely large explosions on the Sun's surface.
*Illustrative imageDirect Searches for Dark Matter
If dark matter is a particle that interacts weakly, it may be possible to approach its identity by detecting its reactions with atomic nuclei. The lab participates in the XENONnT experiment, which uses liquid xenon, and conducts direct searches.
MembersFaculty
- ProfessorHiroyasu Tajima
- ProfessorMasaki Yamashita
- Associate ProfessorFusa Miyake
- Associate ProfessorKazutaka Yamaoka
- Assistant ProfessorHiroaki Menjo
- Project Assistant ProfessorMasatoshi Kobayashi
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: “The Alpha Magnetic Spectrometer (AMS), a cosmic particle detector (iss075e0086247)” NASA Johnson Space Center / Public domain (cropped)
- LHCf/RHICf Experiments: “A section of Relativistic Heavy Ion Collider” Z22 / CC BY-SA 4.0 (cropped)
- Properties and Searches of Neutrinos: “Groeeser.Hamamatsu.Photomultiplier” Bautsch / CC0 (cropped)
- Measuring Carbon-14 in Tree Rings: “Tree rings” Arnoldius / CC BY-SA 2.5 (cropped)
- Direct Searches for Dark Matter: “Large Underground Xenon detector inside watertank” Gigaparsec (English Wikipedia) / CC BY 3.0 (cropped)
- Related lab (High Energy Particle Physics Lab (N)): “Accelerator Desy 2” Milkodromeda / CC BY-SA 4.0 (cropped)
- Related lab (Fundamental Particle Physics (F) Lab): “Fermilab g-2 (E989) ring” Reidar Hahn / CC BY-SA 4.0 (cropped)
- Related lab (Space Physics Observation (SSE) Lab): “Aurora Borealis over the Killarney Provincial Park Observatory” KillarneyDiscovery / CC0 (cropped)
- Related lab (Atmospheric Environmental Change (AM) Lab): “Cirrus uncinus clouds in the morning sky” ADARSHluck / CC BY-SA 4.0 (cropped)
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