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Yamaguchi (H.) Lab / Nuclear Astrophysics Group (CRIB)
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A lab that uses unstable nuclear beams to explore the origin of the elements in the universe.
AboutAbout the lab
Exploring the origin of the elements in the universe through nuclear experiments
The Yamaguchi Lab studies nuclear reactions involved in the nucleosynthesis in the universe, as well as the characteristic structures of atomic nuclei.
The lab conducts experiments with low-energy unstable nuclear beams, using CRIB, an apparatus that the Center for Nuclear Study installed at the RIKEN accelerator facility.
Apparatus that can produce such beams through direct reactions is rare even among research institutions around the world.
Under broad international collaboration, the lab carries out a wide range of experiments that make use of CRIB's beams.
Key terms
- Unstable nucleus
- A nucleus whose numbers of protons and neutrons are poorly balanced, so that it changes into a different nucleus within a short time
- Nucleosynthesis
- The creation of new elements through reactions between atomic nuclei, inside stars or in explosions
- Resonant scattering
- A method of studying the states of a nucleus by colliding beam nuclei with it and observing how they scatter strongly at specific energies
ResearchResearch themes
The lab aims to elucidate the origin of the elements in the universe and the characteristic structures of atomic nuclei. It pursues experimental research by taking advantage of CRIB, an apparatus that can produce unstable nuclear beams at energies close to those corresponding to the temperatures of astronomical objects.
*Illustrative imageNucleosynthesis in the Universe and Nuclear Reactions
The lab measures, both directly and indirectly, key nuclear reactions involved in the nucleosynthesis in the universe. It investigates the role that proton-rich unstable nuclei play in the universe, as well as the nucleosynthesis that occurs in explosive phenomena such as the Big Bang, supernova explosions, and X-ray bursts.
*Illustrative imageProbing Nuclear Structure with Resonant Scattering
Using a distinctive resonant scattering method, the lab observes nuclear resonances and aims to elucidate characteristic nuclear structures such as proton halos and alpha-cluster structures.
MembersFaculty
The members of the Yamaguchi Lab consist of faculty, project researchers and postdoctoral researchers, academic support staff, and graduate students on internships.As of 2026
- LecturerYamaguchi HidetoshiPublications ↗
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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: “RIKEN BigRIPS P4213487” Kestrel / CC BY-SA 4.0 (cropped)
- Nucleosynthesis in the Universe and Nuclear Reactions: “Aссretion Spins Pulsar to Millisecond Range” Dana Berry/NASA Goddard Space Flight Center / Public domain (cropped)
- Probing Nuclear Structure with Resonant Scattering: “RIKEN Supercomducting Ring Cyclotron P4213471” Kestrel / CC BY-SA 4.0 (cropped)
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