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Cosmic Ray Research Division Lab
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A research division that explores the universe, elementary particles, and the Earth using cosmic rays arriving from space.
AboutAbout the lab
Exploring the universe and the Earth through cosmic rays
The Cosmic Ray Research Division studies cosmic rays, the natural radiation that rains down on the Earth from space.
Its work includes observations to find the origin of cosmic rays, research on open questions that span the universe and elementary particles, and research on the connections between cosmic rays and the Sun and Earth.
The division is one of the core research divisions of the Institute for Space-Earth Environmental Research. The research fields of Project Assistant Professor Masatoshi Kobayashi are astroparticle physics, dark matter searches, and neutrinos.
In collaboration with the Graduate School of Science and the Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, the division works to train researchers who can move freely among three fields: astrophysics, particle and nuclear physics, and geophysics.
Key terms
- cosmic rays
- Natural radiation that rains down on the Earth from space. Its main component is protons, and it also includes electrons, atomic nuclei, gamma rays, and neutrinos.
- radiocarbon (carbon-14)
- One of the cosmogenic nuclides, produced by nuclear reactions that cosmic rays cause in the Earth's atmosphere. Its amount in tree rings is measured.
ResearchResearch themes
The Cosmic Ray Research Division investigates the origin of cosmic rays that rain down on the Earth from space, as well as what cosmic rays reveal about elementary particles and about the Sun and Earth. Its research spans three fields: astrophysics, particle and nuclear physics, and geophysics.
*Illustrative imageExploring the origin of cosmic rays
Through observations of solar neutrons and cosmic gamma rays, the division aims to clarify where cosmic rays come from. This work is intended to lead to an understanding of the particle acceleration mechanisms common to cosmic plasmas.
*Illustrative imageFrom cosmic rays to elementary particles and dark matter
The division studies ultra-high-energy cosmic ray collisions at the LHC accelerator and researches neutrinos and dark matter, taking on open questions that span the universe and elementary particles.
*Illustrative imageCosmic rays and their connection to the Sun and Earth
In collaboration with divisions such as the Chronological Research Division, the division explores the connections between cosmic rays and the Sun and Earth by measuring radiocarbon (carbon-14) in tree rings. It uses the tree rings of Yakushima cedars to study past solar activity and increases in cosmic rays.
*Illustrative imageSearching for exoplanets and dark matter
The division has installed a dedicated 1.8 m wide-field optical telescope at Mount John Observatory in New Zealand, and uses the gravitational microlensing effect to search for exoplanets and dark matter.
MembersFaculty
- 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: “Notre Dame QuarkNet Center classroom cosmic ray detector setup” CusterDome / CC0 (cropped)
- Exploring the origin of cosmic rays: “Observatorio de Rayos Gamma HAWC 1” Marifer Veloz / CC BY-SA 4.0 (cropped)
- From cosmic rays to elementary particles and dark matter: “CERN Large Hadron Collider” Chris Mitchell / CC BY-SA 4.0 (cropped)
- Cosmic rays and their connection to the Sun and Earth: “Shiratani Unsui Gorge 20” Σ64 / CC BY 3.0 (cropped)
- Searching for exoplanets and dark matter: “Mount John University Observatory 334” geekgirltakingpics / CC BY-SA 2.0 (cropped)
- Related lab (Ionospheric and Magnetospheric Research Division Lab): “EISCAT Svalbard radar 01” Bernt Rostad from Oslo, Norway / CC BY 2.0 (cropped)
- Related lab (Integrated Analysis Division (Kanya Kusano) Lab): “Strong Solar Flare Erupts from Sun, May 27, 2024 and Another May 29th (SVS14597)” NASA's Scientific Visualization Studio - KBR Wyle Services, LLC/Scott Wiessinger / Public domain (cropped)
- Related lab (Terrestrial and Marine Biosphere Ecology Lab (Yoshiki Fukutomi)): “Earth Observation (iss069e054648)” NASA Johnson Space Center / Sultan Alneyadi / Public domain (cropped)
- Related lab (Orbital and Suborbital Observations Lab (Joji Ishizaka)): “Phytoplankton bloom in the North Atlantic Ocean (MODIS )” Jeff Schmaltz, MODIS Land Rapid Response Team, NASA GSFC / Public domain (cropped)
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