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Applied Nuclear Physics Lab
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A lab that measures the decay of unstable nuclei to uncover their properties.
AboutAbout the lab
Measuring radiation to reach unknown nuclei
The Applied Nuclear Physics Lab measures the radiation emitted when unstable nuclei decay, and studies their properties.
Of the more than 6,000 nuclides thought to exist, fewer than 300 are stable; most are unstable nuclei that decay.
The lab measures radiation from unstable nuclei produced artificially with accelerators and nuclear reactors, in order to search for unknown nuclei and to reveal the characteristics of their decay.
It also develops new detectors and analysis methods for this purpose.
Key terms
- Unstable nucleus
- A nucleus that emits radiation over time and turns into a different nucleus.
- Decay data
- Basic data summarizing the half-life of a nucleus when it decays, and the type and intensity of the radiation it emits.
- Online isotope separator
- A device that quickly sorts, on the spot, nuclei just produced in a reactor or accelerator by type.
- Scintillator
- A material that emits light when struck by radiation. The light is captured to detect the radiation.
ResearchResearch themes
The lab measures radiation (alpha, beta, and gamma rays) from unstable nuclei produced with accelerators and nuclear reactors, searching for unknown nuclei while revealing the characteristics of their decay. It determines decay data such as half-lives and gamma-ray emission probabilities, and develops new detectors and analysis methods for that purpose.
*Illustrative imageStudying the Decay of Unstable Nuclei
Nuclei with half-lives of a few seconds, produced by fission and nuclear reactions in reactors and accelerators, are quickly separated with an online isotope separator, and decay data such as half-lives and gamma-ray emission probabilities are measured. The lab uses the Kyoto University Research Reactor and the tandem accelerator of the Japan Atomic Energy Agency.
*Illustrative imageMeasuring Very Short Lifetimes
By combining plastic scintillators and LaBr3(Ce) scintillators, the lab determines the lifetimes of nuclear excited levels down to the sub-nanosecond scale. Using the X-ray converter method, it aims to measure lifetimes with gamma rays of lower energy than before.
*Illustrative imageMeasuring Gamma Rays Correctly
When measuring gamma rays with Ge detectors, the lab is verifying methods to correct for the coincidence summing effect, which becomes larger the closer the source is to the detector. It is also examining a simple way to correct for volume sources, in which the radioactive material is spread out.
MembersFaculty
- ProfessorMichihiro Shibata
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.
- Top image: “Gamma-Ray Imaging Spectrometer (GRIS) INSTRUMENT - Chris Miller - DPLA - 88f054714d3aae312b9aa7af03dff630” National Aeronautics and Space Administration. Goddard Space Flight Center. 5/1/1959 / Public domain (cropped)
- Studying the Decay of Unstable Nuclei: “BNL MP tandem Van de Graaff” Peter Thieberger / Public domain (cropped)
- Measuring Very Short Lifetimes: “SGCat24454-scint-gris.noirEtBlanc” Saint-Gobain Crystals / Public domain (cropped)
- Measuring Gamma Rays Correctly: “A wafer of germanium is mounted in a cryostat” Uncredited/NBS / Public domain (cropped)
- Related lab (Nuclear Energy Control Engineering Lab): “Kozloduy Nuclear Power Plant - Control Room of Units 3 and 4” Yovko Lambrev / CC BY 3.0 (cropped)
- Related lab (Nuclear Measurement Engineering Lab): “Experiment using an electronic neutron generator” Idaho National Laboratory / CC BY 2.0 (cropped)
- Related lab (Fusion Plasma Science and Engineering Lab): “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped)
- Related lab (Applied Isotope Science Lab): “Nuclear Fusion Reactor ( )” Steve Jurvetson from Los Altos, USA / CC BY 2.0 (cropped)
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