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Low-Energy Nuclear Physics Lab (Ozawa Lab)
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A lab that explores the structure of unstable nuclei and how the elements of the universe are formed.
AboutAbout the lab
Toward understanding cosmic nucleosynthesis and the nuclear structure of unstable nuclei
The Low-Energy Nuclear Group (Ozawa Lab) uses accelerators to study cosmic nucleosynthesis and the nuclear structure of unstable nuclei.
Experiments use the tandem accelerator at the University of Tsukuba as well as large accelerator facilities such as the Institute for Quantum Medical Science in Chiba Prefecture and RIKEN in Saitama Prefecture.
The lab says that the reward of its work lies in being able to understand everything from developing measurement instruments to conducting experiments and analyzing data.
The lab invites anyone with even a slight interest in unstable nuclei or instrument development to drop by.
Key terms
- Unstable nuclei
- Nuclei that cannot exist stably in nature and decay into stable nuclei with a certain lifetime
- RI beam
- A beam of unstable nuclei. Developed in the 1980s, it greatly advanced research on unstable nuclei.
- Rare-RI Ring
- An experimental apparatus at the RIKEN RI Beam Factory. It is used for systematic mass measurements of unstable nuclei.
NewsLab news
An undergraduate student received the Best Presentation Award at the College of Physics graduation ceremony
A doctoral student received the NUSYS Award for Young Scientists at NUSYS2025
A paper on the time-of-flight detector used at the Rare-RI Ring has been published
A paper on the measurement of the sign of nuclear moments, performed at the University of Tsukuba's tandem accelerator, has been published
A paper on the performance evaluation of the Rare-RI Ring has been published
ResearchResearch themes
The Ozawa Lab uses accelerators to experimentally investigate the pathways by which elements formed in the universe and the structure of unstable nuclei. Experiments are carried out at the University of Tsukuba's tandem accelerator and at large accelerator facilities such as the Institute for Quantum Medical Science and RIKEN.
*Illustrative imageExperimental study of cosmic nucleosynthesis
Uranium is thought to have been produced by explosive neutron-capture reactions that occur over an extremely short time. To learn about this pathway, the lab aims to carry out systematic mass measurements of unstable nuclei at the Rare-RI Ring at RIKEN.
*Illustrative imageStudy of the nuclear structure of unstable nuclei
The structure of unstable nuclei, which do not exist stably in nature, is still largely unknown. Using RI beams, the lab systematically measures nuclear radii to test whether the "common sense" found in textbooks for stable nuclei also applies to them.
MembersFaculty
The members of the Ozawa Lab consist of faculty, faculty from the cooperative graduate school program, cross-appointed faculty, visiting faculty, doctoral, master's, and undergraduate students, and research students.As of 2026
- ProfessorAkira Ozawa
- Assistant ProfessorTetsuaki Moriguchi
- Associate Professor (Collaborative Graduate School)Shunji Nishimura
- Associate Professor (Cross-Appointment)Takayuki Yamaguchi
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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: “Jefferson Lab Thomas Jefferson National Accelerator Facility, in Virginia ( )” doe-oakridge / Public domain (cropped)
- Experimental study of cosmic nucleosynthesis: “Uranium ore and "yellowcake" uranium concentrate at the Greifswald Nuclear Power Plant information center” Siarhei Besarab / CC BY-SA 4.0 (cropped)
- Study of the nuclear structure of unstable nuclei: “Cyclotron ARRONAX” Popocatomar / CC BY-SA 4.0 (cropped)
- Related lab (応用加速器部門
（UTTAC／笹研究室） ): “Holifield's tandem electrostatic accelerator ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped) - Related lab (原子核理論グループ（原子核理論研究室）
): “Institute of nuclear and particle physics 00048 REP SDR-65 (0666)” DimitrisSideridis / CC BY-SA 4.0 (cropped) - Related lab (素粒子実験グループ（素粒子実験研究室）
): “CERN Geneva, Neutrino detections chamber at protoDUNE experiment, seen from outside, Dec 2023 (Mark Benecke)” Markbenecke / CC BY-SA 4.0 (cropped) - Related lab (プラズマ物理グループ（プラズマ研究センター）
): “Experimental hall of the Wendelstein 7-X stellarator at IPP Greifswald 01” Siarhei Besarab / CC BY-SA 4.0 (cropped)
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